diff --git a/tests-ng/tests-launcher.py b/tests-ng/tests-launcher.py
index 010e20f..3a509b0 100755
--- a/tests-ng/tests-launcher.py
+++ b/tests-ng/tests-launcher.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# pylint: disable-msg=C0103
 """
 author: deadc0de6 (https://github.com/deadc0de6)
 Copyright (c) 2020, deadc0de6
@@ -32,6 +33,7 @@ def run_test(logfd, path):
     if logfd:
         logfd.write(f'starting test \"{path}\"\n')
         logfd.flush()
+    # pylint: disable=R1732
     proc = subprocess.Popen(path, shell=False,
                             stdout=subprocess.PIPE,
                             stderr=subprocess.STDOUT,
@@ -73,6 +75,7 @@ def main():
 
     logfd = sys.stdout
     if not is_cicd():
+        # pylint: disable=R1732
         logfd = open(LOG_FILE, 'w', encoding='utf-8')
     if max_jobs:
         logfd.write(f'run tests with {max_jobs} parallel job(s)\n')
@@ -95,6 +98,7 @@ def main():
         for test in futures.as_completed(wait_for.keys()):
             try:
                 ret, reason, name, log = test.result()
+            # pylint: disable=W0703
             except Exception as exc:
                 print()
                 print(f'test \"{wait_for[test]}\" failed: {exc}')
diff --git a/tests/dummy.py b/tests/dummy.py
index b85de83..1c4b939 100644
--- a/tests/dummy.py
+++ b/tests/dummy.py
@@ -10,11 +10,13 @@ import dotdrop
 
 
 class TestDummy(unittest.TestCase):
+    """test case"""
 
     dotdrop.main()
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/helpers.py b/tests/helpers.py
index 8b604ff..3c50a7a 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -21,27 +21,30 @@ TMPSUFFIX = '-dotdrop-tests'
 
 
 class SubsetTestCase(TestCase):
-    def assertIsSubset(self, sub, sup):
-        for subKey, subValue in sub.items():
-            self.assertIn(subKey, sup)
-            supValue = sup[subKey]
+    """test case"""
 
-            if isinstance(subValue, str):
-                self.assertEqual(subValue, supValue)
+    def assert_is_subset(self, sub, sup):
+        """ensure it's a subset"""
+        for sub_key, sub_val in sub.items():
+            self.assertIn(sub_key, sup)
+            subvalue = sup[sub_key]
+
+            if isinstance(sub_val, str):
+                self.assertEqual(sub_val, subvalue)
                 continue
 
-            if isinstance(subValue, dict):
-                self.assertIsSubset(subValue, supValue)
+            if isinstance(sub_val, dict):
+                self.assert_is_subset(sub_val, subvalue)
                 continue
 
             try:
-                iter(subValue)
+                iter(sub_val)
                 self.assertTrue(all(
-                    subItem in supValue
-                    for subItem in subValue
+                    subItem in subvalue
+                    for subItem in sub_val
                 ))
             except TypeError:
-                self.assertEqual(subValue, supValue)
+                self.assertEqual(sub_val, subvalue)
 
 
 def clean(path):
@@ -60,7 +63,7 @@ def get_string(length):
     """Get a random string of length 'length'"""
     alpha = string.ascii_uppercase + string.digits
     temp = ''.join(random.choice(alpha) for _ in range(length))
-    return 'tmp.{}{}'.format(temp, TMPSUFFIX)
+    return f'tmp.{temp}{TMPSUFFIX}'
 
 
 def get_tempdir():
@@ -82,15 +85,16 @@ def create_random_file(directory, content=None,
             pre = bytes()
             if template:
                 pre = bytes('{{@@ header() @@}}\n', 'ascii')
-            content = bytes('{}{}\n'.format(pre, get_string(100)), 'ascii')
+            content = bytes(f'{pre}{get_string(100)}\n', 'ascii')
         else:
             pre = ''
             if template:
                 pre = '{{@@ header() @@}}\n'
-            content = '{}{}\n'.format(pre, get_string(100))
+            content = f'{pre}{get_string(100)}\n'
     path = os.path.join(directory, fname)
-    with open(path, mode) as f:
-        f.write(content)
+    # pylint: disable=W1514
+    with open(path, mode) as file:
+        file.write(content)
     return path, content
 
 
@@ -99,8 +103,9 @@ def edit_content(path, newcontent, binary=False):
     mode = 'w'
     if binary:
         mode = 'wb'
-    with open(path, mode) as f:
-        f.write(newcontent)
+    # pylint: disable=W1514
+    with open(path, mode) as file:
+        file.write(newcontent)
 
 
 def create_dir(path):
@@ -159,15 +164,16 @@ def load_options(confpath, profile):
     args['--profile'] = profile
     args['--verbose'] = True
     # and get the options
-    o = Options(args=args)
-    o.profile = profile
-    o.dry = False
-    o.safe = False
-    o.install_diff = True
-    o.import_link = LinkTypes.NOLINK
-    o.install_showdiff = True
-    o.debug = True
-    return o
+    opt = Options(args=args)
+    opt.profile = profile
+    opt.dry = False
+    opt.safe = False
+    opt.install_diff = True
+    opt.import_link = LinkTypes.NOLINK
+    opt.install_showdiff = True
+    opt.debug = True
+    opt.dotpath = os.path.join(os.path.dirname(confpath), 'dotfiles')
+    return opt
 
 
 def get_path_strip_version(path):
@@ -192,7 +198,9 @@ def get_dotfile_from_yaml(dic, path):
 
 
 def yaml_dashed_list(items, indent=0):
-    return ('\n'.join('{}- {}'.format(' ' * indent, item) for item in items)
+    """yaml dashed list"""
+    ind = ' ' * indent
+    return ('\n'.join(f'{ind}- {item}' for item in items)
             + '\n')
 
 
@@ -203,28 +211,29 @@ def create_fake_config(directory, configname='config.yaml',
     """Create a fake config file"""
     path = os.path.join(directory, configname)
     workdir = os.path.join(directory, 'workdir')
-    with open(path, 'w') as f:
-        f.write('config:\n')
-        f.write('  backup: {}\n'.format(str(backup)))
-        f.write('  create: {}\n'.format(str(create)))
-        f.write('  dotpath: {}\n'.format(dotpath))
-        f.write('  workdir: {}\n'.format(workdir))
+    with open(path, 'w', encoding='utf-8') as file:
+        file.write('config:\n')
+        file.write(f'  backup: {backup}\n')
+        file.write(f'  create: {create}\n')
+        file.write(f'  dotpath: {dotpath}\n')
+        file.write(f'  workdir: {workdir}\n')
         if import_actions:
-            f.write('  import_actions:\n')
-            f.write(yaml_dashed_list(import_actions, 4))
+            file.write('  import_actions:\n')
+            file.write(yaml_dashed_list(import_actions, 4))
         if import_configs:
-            f.write('  import_configs:\n')
-            f.write(yaml_dashed_list(import_configs, 4))
+            file.write('  import_configs:\n')
+            file.write(yaml_dashed_list(import_configs, 4))
         if import_variables:
-            f.write('  import_variables:\n')
-            f.write(yaml_dashed_list(import_variables, 4))
-        f.write('dotfiles:\n')
-        f.write('profiles:\n')
-        f.write('actions:\n')
+            file.write('  import_variables:\n')
+            file.write(yaml_dashed_list(import_variables, 4))
+        file.write('dotfiles:\n')
+        file.write('profiles:\n')
+        file.write('actions:\n')
     return path
 
 
 def create_yaml_keyval(pairs, parent_dir=None, top_key=None):
+    """create key val for yaml"""
     if top_key:
         pairs = {top_key: pairs}
     if not parent_dir:
@@ -235,6 +244,7 @@ def create_yaml_keyval(pairs, parent_dir=None, top_key=None):
     return file_name
 
 
+# pylint: disable=W0102
 def populate_fake_config(config, dotfiles={}, profiles={}, actions={},
                          trans={}, trans_write={}, variables={},
                          dynvariables={}):
@@ -267,14 +277,14 @@ def file_in_yaml(yaml_file, path, link=False):
 
     dotfiles = yaml_conf['dotfiles'].values()
 
-    in_src = any([x['src'].endswith(strip) for x in dotfiles])
+    in_src = any(x['src'].endswith(strip) for x in dotfiles)
     in_dst = path in (os.path.expanduser(x['dst']) for x in dotfiles)
 
     if link:
-        df = get_dotfile_from_yaml(yaml_conf, path)
+        dotfile = get_dotfile_from_yaml(yaml_conf, path)
         has_link = False
-        if df:
-            has_link = 'link' in df
+        if dotfile:
+            has_link = 'link' in dotfile
         else:
             return False
         return in_src and in_dst and has_link
@@ -282,15 +292,17 @@ def file_in_yaml(yaml_file, path, link=False):
 
 
 def yaml_load(path):
-    with open(path, 'r') as f:
-        content = yaml(typ='safe').load(f)
+    """load yaml"""
+    with open(path, 'r', encoding='utf-8') as file:
+        content = yaml(typ='safe').load(file)
     return content
 
 
 def yaml_dump(content, path):
-    with open(path, 'w') as f:
-        y = yaml()
-        y.default_flow_style = False
-        y.indent = 2
-        y.typ = 'safe'
-        y.dump(content, f)
+    """dump yaml"""
+    with open(path, 'w', encoding='utf-8') as file:
+        cont = yaml()
+        cont.default_flow_style = False
+        cont.indent = 2
+        cont.typ = 'safe'
+        cont.dump(content, file)
diff --git a/tests/test_compare.py b/tests/test_compare.py
index b436c92..e4521d5 100644
--- a/tests/test_compare.py
+++ b/tests/test_compare.py
@@ -20,24 +20,26 @@ from tests.helpers import create_dir, get_string, get_tempdir, clean, \
 
 
 class TestCompare(unittest.TestCase):
+    """test case"""
 
     CONFIG_BACKUP = False
     CONFIG_CREATE = True
     CONFIG_DOTPATH = 'dotfiles'
     CONFIG_NAME = 'config.yaml'
 
-    def compare(self, o, tmp, nbdotfiles):
-        dotfiles = o.dotfiles
+    def compare(self, opt, tmp, nbdotfiles):
+        """compare"""
+        dotfiles = opt.dotfiles
         self.assertTrue(len(dotfiles) == nbdotfiles)
-        t = Templategen(base=o.dotpath, debug=True)
-        inst = Installer(create=o.create, backup=o.backup,
-                         dry=o.dry, base=o.dotpath, debug=o.debug)
+        templ = Templategen(base=opt.dotpath, debug=True)
+        inst = Installer(create=opt.create, backup=opt.backup,
+                         dry=opt.dry, base=opt.dotpath, debug=opt.debug)
         comp = Comparator()
         results = {}
         for dotfile in dotfiles:
             path = os.path.expanduser(dotfile.dst)
-            ret, err, insttmp = inst.install_to_temp(t, tmp, dotfile.src,
-                                                     dotfile.dst)
+            ret, _, insttmp = inst.install_to_temp(templ, tmp, dotfile.src,
+                                                   dotfile.dst)
             if not ret:
                 results[path] = False
                 continue
@@ -47,9 +49,10 @@ class TestCompare(unittest.TestCase):
         return results
 
     def test_none(self):
-        t = Templategen(base=self.CONFIG_DOTPATH,
-                        debug=True, variables=None)
-        self.assertTrue(t is not None)
+        """test none"""
+        templ = Templategen(base=self.CONFIG_DOTPATH,
+                            debug=True, variables=None)
+        self.assertTrue(templ is not None)
 
     def test_compare(self):
         """Test the compare function"""
@@ -74,33 +77,33 @@ class TestCompare(unittest.TestCase):
         self.addCleanup(clean, dotfilespath)
 
         # create the dotfiles to test
-        d1, c1 = create_random_file(fold_config)
-        self.assertTrue(os.path.exists(d1))
-        self.addCleanup(clean, d1)
+        df1, _ = create_random_file(fold_config)
+        self.assertTrue(os.path.exists(df1))
+        self.addCleanup(clean, df1)
 
-        d2, c2 = create_random_file(fold_subcfg)
-        self.assertTrue(os.path.exists(d2))
-        self.addCleanup(clean, d2)
+        df2, _ = create_random_file(fold_subcfg)
+        self.assertTrue(os.path.exists(df2))
+        self.addCleanup(clean, df2)
 
-        d3, c3 = create_random_file(fold_tmp)
-        self.assertTrue(os.path.exists(d3))
-        self.addCleanup(clean, d3)
+        df3, _ = create_random_file(fold_tmp)
+        self.assertTrue(os.path.exists(df3))
+        self.addCleanup(clean, df3)
 
-        d4, c4 = create_random_file(fold_tmp, binary=True)
-        self.assertTrue(os.path.exists(d4))
-        self.addCleanup(clean, d4)
+        df4, _ = create_random_file(fold_tmp, binary=True)
+        self.assertTrue(os.path.exists(df4))
+        self.addCleanup(clean, df4)
 
-        d5 = get_tempdir()
-        self.assertTrue(os.path.exists(d5))
-        self.addCleanup(clean, d5)
+        df5 = get_tempdir()
+        self.assertTrue(os.path.exists(df5))
+        self.addCleanup(clean, df5)
 
-        d6, _ = create_random_file(d5)
-        self.assertTrue(os.path.exists(d6))
+        df6, _ = create_random_file(df5)
+        self.assertTrue(os.path.exists(df6))
 
-        d9 = get_tempdir()
-        self.assertTrue(os.path.exists(d9))
-        self.addCleanup(clean, d9)
-        d9sub = os.path.join(d9, get_string(5))
+        df9 = get_tempdir()
+        self.assertTrue(os.path.exists(df9))
+        self.addCleanup(clean, df9)
+        d9sub = os.path.join(df9, get_string(5))
         create_dir(d9sub)
         d9f1, _ = create_random_file(d9sub)
 
@@ -112,69 +115,70 @@ class TestCompare(unittest.TestCase):
                                       backup=self.CONFIG_BACKUP,
                                       create=self.CONFIG_CREATE)
         self.assertTrue(os.path.exists(confpath))
-        o = load_options(confpath, profile)
-        o.longkey = True
-        o.debug = True
-        dfiles = [d1, d2, d3, d4, d5, d9]
+        opt = load_options(confpath, profile)
+        opt.longkey = True
+        opt.debug = True
+        dfiles = [df1, df2, df3, df4, df5, df9]
 
         # import the files
-        o.import_path = dfiles
-        cmd_importer(o)
-        o = load_options(confpath, profile)
+        opt.import_path = dfiles
+        cmd_importer(opt)
+        opt = load_options(confpath, profile)
 
         # compare the files
-        expected = {d1: True, d2: True, d3: True, d4: True,
-                    d5: True, d9: True}
-        results = self.compare(o, tmp, len(dfiles))
+        expected = {df1: True, df2: True, df3: True, df4: True,
+                    df5: True, df9: True}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # modify file
-        edit_content(d1, get_string(20))
-        expected = {d1: False, d2: True, d3: True, d4: True,
-                    d5: True, d9: True}
-        results = self.compare(o, tmp, len(dfiles))
+        edit_content(df1, get_string(20))
+        expected = {df1: False, df2: True, df3: True, df4: True,
+                    df5: True, df9: True}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # modify binary file
-        edit_content(d4, bytes(get_string(20), 'ascii'), binary=True)
-        expected = {d1: False, d2: True, d3: True, d4: False,
-                    d5: True, d9: True}
-        results = self.compare(o, tmp, len(dfiles))
+        edit_content(df4, bytes(get_string(20), 'ascii'), binary=True)
+        expected = {df1: False, df2: True, df3: True, df4: False,
+                    df5: True, df9: True}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # add file in directory
-        d7, _ = create_random_file(d5)
-        self.assertTrue(os.path.exists(d7))
-        expected = {d1: False, d2: True, d3: True, d4: False,
-                    d5: False, d9: True}
-        results = self.compare(o, tmp, len(dfiles))
+        df7, _ = create_random_file(df5)
+        self.assertTrue(os.path.exists(df7))
+        expected = {df1: False, df2: True, df3: True, df4: False,
+                    df5: False, df9: True}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # modify all files
-        edit_content(d2, get_string(20))
-        edit_content(d3, get_string(21))
-        expected = {d1: False, d2: False, d3: False, d4: False,
-                    d5: False, d9: True}
-        results = self.compare(o, tmp, len(dfiles))
+        edit_content(df2, get_string(20))
+        edit_content(df3, get_string(21))
+        expected = {df1: False, df2: False, df3: False, df4: False,
+                    df5: False, df9: True}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # edit sub file
         edit_content(d9f1, get_string(12))
-        expected = {d1: False, d2: False, d3: False, d4: False,
-                    d5: False, d9: False}
-        results = self.compare(o, tmp, len(dfiles))
+        expected = {df1: False, df2: False, df3: False, df4: False,
+                    df5: False, df9: False}
+        results = self.compare(opt, tmp, len(dfiles))
         self.assertTrue(results == expected)
 
         # test compare from dotdrop
-        self.assertFalse(cmd_compare(o, tmp))
+        self.assertFalse(cmd_compare(opt, tmp))
         # test focus
-        o.compare_focus = [d4]
-        self.assertFalse(cmd_compare(o, tmp))
-        o.compare_focus = ['/tmp/fake']
-        self.assertFalse(cmd_compare(o, tmp))
+        opt.compare_focus = [df4]
+        self.assertFalse(cmd_compare(opt, tmp))
+        opt.compare_focus = ['/tmp/fake']
+        self.assertFalse(cmd_compare(opt, tmp))
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_import.py b/tests/test_import.py
index 186382a..bee09b1 100644
--- a/tests/test_import.py
+++ b/tests/test_import.py
@@ -22,6 +22,7 @@ from tests.helpers import (clean, create_dir, create_fake_config,
 
 
 class TestImport(unittest.TestCase):
+    """test case"""
 
     CONFIG_BACKUP = False
     CONFIG_CREATE = True
@@ -33,11 +34,11 @@ class TestImport(unittest.TestCase):
         self.assertTrue(os.path.exists(path))
         return yaml_load(path)
 
-    def assert_file(self, path, o, profile):
+    def assert_file(self, path, opt, _profile):
         """Make sure path has been inserted in conf for profile"""
         strip = get_path_strip_version(path)
-        self.assertTrue(any(x.src.endswith(strip) for x in o.dotfiles))
-        dsts = (os.path.expanduser(x.dst) for x in o.dotfiles)
+        self.assertTrue(any(x.src.endswith(strip) for x in opt.dotfiles))
+        dsts = (os.path.expanduser(x.dst) for x in opt.dotfiles)
         self.assertTrue(path in dsts)
 
     def assert_in_yaml(self, path, dic, link=False):
@@ -63,12 +64,12 @@ class TestImport(unittest.TestCase):
                                       backup=self.CONFIG_BACKUP,
                                       create=self.CONFIG_CREATE)
         self.assertTrue(os.path.exists(confpath))
-        o = load_options(confpath, profile)
+        opt = load_options(confpath, profile)
 
         # create some random dotfiles
-        dotfile1, content1 = create_random_file(src)
+        dotfile1, _ = create_random_file(src)
         self.addCleanup(clean, dotfile1)
-        dotfile2, content2 = create_random_file(os.path.expanduser('~'))
+        dotfile2, _ = create_random_file(os.path.expanduser('~'))
         self.addCleanup(clean, dotfile2)
         homeconf = os.path.join(os.path.expanduser('~'), '.config')
         if not os.path.exists(homeconf):
@@ -77,8 +78,8 @@ class TestImport(unittest.TestCase):
         dotconfig = os.path.join(homeconf, get_string(5))
         create_dir(dotconfig)
         self.addCleanup(clean, dotconfig)
-        dotfile3, content3 = create_random_file(dotconfig)
-        dotfile4, content3 = create_random_file(homeconf)
+        dotfile3, _ = create_random_file(dotconfig)
+        dotfile4, _ = create_random_file(homeconf)
         self.addCleanup(clean, dotfile4)
 
         # fake a directory containing dotfiles
@@ -89,7 +90,7 @@ class TestImport(unittest.TestCase):
         sub2, _ = create_random_file(dotfile5)
 
         # fake a file for symlink
-        dotfile6, content6 = create_random_file(dotconfig)
+        dotfile6, _ = create_random_file(dotconfig)
         self.addCleanup(clean, dotfile6)
 
         # fake a directory for symlink
@@ -101,37 +102,37 @@ class TestImport(unittest.TestCase):
 
         # import the dotfiles
         dfiles = [dotfile1, dotfile2, dotfile3, dotfile4, dotfile5]
-        o.import_path = dfiles
-        cmd_importer(o)
+        opt.import_path = dfiles
+        cmd_importer(opt)
         # import symlink
-        o.import_link = LinkTypes.LINK
+        opt.import_link = LinkTypes.LINK
         sfiles = [dotfile6, dotfile7]
-        o.import_path = sfiles
-        cmd_importer(o)
-        o.import_link = LinkTypes.NOLINK
+        opt.import_path = sfiles
+        cmd_importer(opt)
+        opt.import_link = LinkTypes.NOLINK
 
         # reload the config
-        o = load_options(confpath, profile)
+        opt = load_options(confpath, profile)
 
         # test dotfiles in config class
-        self.assertTrue(profile in [p.key for p in o.profiles])
-        self.assert_file(dotfile1, o, profile)
-        self.assert_file(dotfile2, o, profile)
-        self.assert_file(dotfile3, o, profile)
-        self.assert_file(dotfile4, o, profile)
-        self.assert_file(dotfile5, o, profile)
-        self.assert_file(dotfile6, o, profile)
-        self.assert_file(dotfile7, o, profile)
+        self.assertTrue(profile in [p.key for p in opt.profiles])
+        self.assert_file(dotfile1, opt, profile)
+        self.assert_file(dotfile2, opt, profile)
+        self.assert_file(dotfile3, opt, profile)
+        self.assert_file(dotfile4, opt, profile)
+        self.assert_file(dotfile5, opt, profile)
+        self.assert_file(dotfile6, opt, profile)
+        self.assert_file(dotfile7, opt, profile)
 
         # test dotfiles in yaml file
-        y = self.load_yaml(confpath)
-        self.assert_in_yaml(dotfile1, y)
-        self.assert_in_yaml(dotfile2, y)
-        self.assert_in_yaml(dotfile3, y)
-        self.assert_in_yaml(dotfile4, y)
-        self.assert_in_yaml(dotfile5, y)
-        self.assert_in_yaml(dotfile6, y, link=True)
-        self.assert_in_yaml(dotfile7, y, link=True)
+        cont2 = self.load_yaml(confpath)
+        self.assert_in_yaml(dotfile1, cont2)
+        self.assert_in_yaml(dotfile2, cont2)
+        self.assert_in_yaml(dotfile3, cont2)
+        self.assert_in_yaml(dotfile4, cont2)
+        self.assert_in_yaml(dotfile5, cont2)
+        self.assert_in_yaml(dotfile6, cont2, link=True)
+        self.assert_in_yaml(dotfile7, cont2, link=True)
 
         # test have been imported in dotdrop dotpath directory
         indt1 = os.path.join(dotfilespath,
@@ -154,16 +155,16 @@ class TestImport(unittest.TestCase):
                              self.CONFIG_DOTPATH,
                              get_path_strip_version(dotfile5))
         self.assertTrue(os.path.exists(indt5))
-        s1 = os.path.join(dotfilespath,
+        fsb1 = os.path.join(dotfilespath,
                           self.CONFIG_DOTPATH,
                           get_path_strip_version(dotfile6),
                           sub1)
-        self.assertTrue(os.path.exists(s1))
-        s2 = os.path.join(dotfilespath,
+        self.assertTrue(os.path.exists(fsb1))
+        fsb2 = os.path.join(dotfilespath,
                           self.CONFIG_DOTPATH,
                           get_path_strip_version(dotfile6),
                           sub2)
-        self.assertTrue(os.path.exists(s2))
+        self.assertTrue(os.path.exists(fsb2))
         indt6 = os.path.join(dotfilespath,
                              self.CONFIG_DOTPATH,
                              get_path_strip_version(dotfile6))
@@ -172,29 +173,31 @@ class TestImport(unittest.TestCase):
                              self.CONFIG_DOTPATH,
                              get_path_strip_version(dotfile7))
         self.assertTrue(os.path.exists(indt7))
-        s3 = os.path.join(dotfilespath,
+        fsb3 = os.path.join(dotfilespath,
                           self.CONFIG_DOTPATH,
                           get_path_strip_version(dotfile7),
                           sub3)
-        self.assertTrue(os.path.exists(s3))
-        s4 = os.path.join(dotfilespath,
+        self.assertTrue(os.path.exists(fsb3))
+        fsb4 = os.path.join(dotfilespath,
                           self.CONFIG_DOTPATH,
                           get_path_strip_version(dotfile7),
                           sub4)
-        self.assertTrue(os.path.exists(s4))
+        self.assertTrue(os.path.exists(fsb4))
 
-        cmd_list_profiles(o)
-        cmd_files(o)
+        cmd_list_profiles(opt)
+        cmd_files(opt)
 
         # fake test update
         editcontent = 'edited'
         edit_content(dotfile1, editcontent)
-        o.safe = False
-        o.update_path = [dotfile1]
-        o.debug = True
-        cmd_update(o)
-        c2 = open(indt1, 'r').read()
-        self.assertTrue(editcontent == c2)
+        opt.safe = False
+        opt.update_path = [dotfile1]
+        opt.debug = True
+        cmd_update(opt)
+        cont = ''
+        with open(indt1, 'r', encoding='utf-8') as file:
+            cont = file.read()
+        self.assertTrue(editcontent == cont)
 
     def test_ext_config_yaml_not_mix(self):
         """Test whether the import_configs mixes yaml files upon importing."""
@@ -311,37 +314,37 @@ class TestImport(unittest.TestCase):
         })
 
         # import the dotfiles
-        o = load_options(imported_path, 'host1')
-        o.import_path = dotfiles_ed
-        cmd_importer(o)
+        opt = load_options(imported_path, 'host1')
+        opt.import_path = dotfiles_ed
+        cmd_importer(opt)
 
-        o = load_options(importing_path, 'host2')
-        o.import_path = dotfiles_ing
-        cmd_importer(o)
+        opt = load_options(importing_path, 'host2')
+        opt.import_path = dotfiles_ing
+        cmd_importer(opt)
 
         # reload the config
-        o = load_options(importing_path, 'host2')
+        opt = load_options(importing_path, 'host2')
 
         # test imported config
-        y = self.load_yaml(imported_path)
+        ycont = self.load_yaml(imported_path)
 
         # testing dotfiles
-        self.assertTrue(all(file_in_yaml(y, df)
+        self.assertTrue(all(file_in_yaml(ycont, df)
                             for df in dotfiles_ed))
-        self.assertFalse(any(file_in_yaml(y, df)
+        self.assertFalse(any(file_in_yaml(ycont, df)
                              for df in dotfiles_ing))
 
         # testing profiles
-        profiles = y['profiles'].keys()
+        profiles = ycont['profiles'].keys()
         self.assertTrue('host1' in profiles)
         self.assertFalse('host2' in profiles)
 
         # testing actions
-        actions = y['actions']['pre']
-        actions.update(y['actions']['post'])
+        actions = ycont['actions']['pre']
+        actions.update(ycont['actions']['post'])
         actions.update({
             k: v
-            for k, v in y['actions'].items()
+            for k, v in ycont['actions'].items()
             if k not in ('pre', 'post')
         })
         actions = actions.keys()
@@ -349,41 +352,41 @@ class TestImport(unittest.TestCase):
         self.assertFalse(any(a.endswith('ing') for a in actions))
 
         # testing transformations
-        transformations = y['trans_read'].keys()
+        transformations = ycont['trans_read'].keys()
         self.assertTrue(all(t.endswith('ed') for t in transformations))
         self.assertFalse(any(t.endswith('ing') for t in transformations))
-        transformations = y['trans_write'].keys()
+        transformations = ycont['trans_write'].keys()
         self.assertTrue(all(t.endswith('ed') for t in transformations))
         self.assertFalse(any(t.endswith('ing') for t in transformations))
 
         # testing variables
-        variables = self._remove_priv_vars(y['variables'].keys())
+        variables = self._remove_priv_vars(ycont['variables'].keys())
         self.assertTrue(all(v.endswith('ed') for v in variables))
         self.assertFalse(any(v.endswith('ing') for v in variables))
-        dyn_variables = y['dynvariables'].keys()
+        dyn_variables = ycont['dynvariables'].keys()
         self.assertTrue(all(dv.endswith('ed') for dv in dyn_variables))
         self.assertFalse(any(dv.endswith('ing') for dv in dyn_variables))
 
         # test importing config
-        y = self.load_yaml(importing_path)
+        ycont = self.load_yaml(importing_path)
 
         # testing dotfiles
-        self.assertTrue(all(file_in_yaml(y, df)
+        self.assertTrue(all(file_in_yaml(ycont, df)
                             for df in dotfiles_ing))
-        self.assertFalse(any(file_in_yaml(y, df)
+        self.assertFalse(any(file_in_yaml(ycont, df)
                              for df in dotfiles_ed))
 
         # testing profiles
-        profiles = y['profiles'].keys()
+        profiles = ycont['profiles'].keys()
         self.assertTrue('host2' in profiles)
         self.assertFalse('host1' in profiles)
 
         # testing actions
-        actions = y['actions']['pre']
-        actions.update(y['actions']['post'])
+        actions = ycont['actions']['pre']
+        actions.update(ycont['actions']['post'])
         actions.update({
             k: v
-            for k, v in y['actions'].items()
+            for k, v in ycont['actions'].items()
             if k not in ('pre', 'post')
         })
         actions = actions.keys()
@@ -391,18 +394,18 @@ class TestImport(unittest.TestCase):
         self.assertFalse(any(action.endswith('ed') for action in actions))
 
         # testing transformations
-        transformations = y['trans_read'].keys()
+        transformations = ycont['trans_read'].keys()
         self.assertTrue(all(t.endswith('ing') for t in transformations))
         self.assertFalse(any(t.endswith('ed') for t in transformations))
-        transformations = y['trans_write'].keys()
+        transformations = ycont['trans_write'].keys()
         self.assertTrue(all(t.endswith('ing') for t in transformations))
         self.assertFalse(any(t.endswith('ed') for t in transformations))
 
         # testing variables
-        variables = self._remove_priv_vars(y['variables'].keys())
+        variables = self._remove_priv_vars(ycont['variables'].keys())
         self.assertTrue(all(v.endswith('ing') for v in variables))
         self.assertFalse(any(v.endswith('ed') for v in variables))
-        dyn_variables = y['dynvariables'].keys()
+        dyn_variables = ycont['dynvariables'].keys()
         self.assertTrue(all(dv.endswith('ing') for dv in dyn_variables))
         self.assertFalse(any(dv.endswith('ed') for dv in dyn_variables))
 
@@ -414,6 +417,7 @@ class TestImport(unittest.TestCase):
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_install.py b/tests/test_install.py
index 6e640ed..c5b17fb 100644
--- a/tests/test_install.py
+++ b/tests/test_install.py
@@ -8,11 +8,10 @@ import os
 import unittest
 from unittest.mock import MagicMock
 import filecmp
-
-from dotdrop.cfg_aggregator import CfgAggregator as Cfg
 from tests.helpers import (clean, create_dir, create_fake_config,
                            create_random_file, get_string, get_tempdir,
                            load_options, populate_fake_config)
+from dotdrop.cfg_aggregator import CfgAggregator as Cfg
 from dotdrop.dotfile import Dotfile
 from dotdrop.installer import Installer
 from dotdrop.action import Action
@@ -23,6 +22,7 @@ from dotdrop.linktypes import LinkTypes
 
 
 class TestInstall(unittest.TestCase):
+    """test case"""
 
     CONFIG_NAME = 'config.yaml'
 
@@ -40,37 +40,38 @@ exec bspwm
 '''
 
     def fake_config(self, path, dotfiles, profile,
-                    dotpath, actions, trans):
+                    dotpath, actions, transs):
         """Create a fake config file"""
-        with open(path, 'w') as f:
-            f.write('actions:\n')
+        with open(path, 'w', encoding='utf-8') as file:
+            file.write('actions:\n')
             for action in actions:
-                f.write('  {}: {}\n'.format(action.key, action.action))
-            f.write('trans:\n')
-            for tr in trans:
-                f.write('  {}: {}\n'.format(tr.key, tr.action))
-            f.write('config:\n')
-            f.write('  backup: true\n')
-            f.write('  create: true\n')
-            f.write('  dotpath: {}\n'.format(dotpath))
-            f.write('dotfiles:\n')
-            for d in dotfiles:
-                f.write('  {}:\n'.format(d.key))
-                f.write('    dst: {}\n'.format(d.dst))
-                f.write('    src: {}\n'.format(d.src))
-                f.write('    link: {}\n'.format(d.link.name.lower()))
-                if len(d.actions) > 0:
-                    f.write('    actions:\n')
-                    for action in d.actions:
-                        f.write('      - {}\n'.format(action.key))
-                if d.trans_r:
-                    for tr in d.trans_r:
-                        f.write('    trans_read: {}\n'.format(tr.key))
-            f.write('profiles:\n')
-            f.write('  {}:\n'.format(profile))
-            f.write('    dotfiles:\n')
-            for d in dotfiles:
-                f.write('    - {}\n'.format(d.key))
+                file.write(f'  {action.key}: {action.action}\n')
+            file.write('trans:\n')
+            for trans in transs:
+                file.write(f'  {trans.key}: {trans.action}\n')
+            file.write('config:\n')
+            file.write('  backup: true\n')
+            file.write('  create: true\n')
+            file.write(f'  dotpath: {dotpath}\n')
+            file.write('dotfiles:\n')
+            for dotfile in dotfiles:
+                linkval = dotfile.link.name.lower()
+                file.write(f'  {dotfile.key}:\n')
+                file.write(f'    dst: {dotfile.dst}\n')
+                file.write(f'    src: {dotfile.src}\n')
+                file.write(f'    link: {linkval}\n')
+                if len(dotfile.actions) > 0:
+                    file.write('    actions:\n')
+                    for action in dotfile.actions:
+                        file.write(f'      - {action.key}\n')
+                if dotfile.trans_r:
+                    for trans in dotfile.trans_r:
+                        file.write(f'    trans_read: {trans.key}\n')
+            file.write('profiles:\n')
+            file.write(f'  {profile}:\n')
+            file.write('    dotfiles:\n')
+            for dotfile in dotfiles:
+                file.write(f'    - {dotfile.key}\n')
         return path
 
     def test_install(self):
@@ -87,40 +88,43 @@ exec bspwm
         self.addCleanup(clean, dst)
 
         # create the dotfile in dotdrop
-        f1, c1 = create_random_file(tmp)
+        fcontent1, _ = create_random_file(tmp)
         dst1 = os.path.join(dst, get_string(6))
-        d1 = Dotfile(get_string(5), dst1, os.path.basename(f1))
+        dotfile1 = Dotfile(get_string(5), dst1, os.path.basename(fcontent1))
         # fake a __str__
-        self.assertTrue(str(d1) != '')
-        f2, c2 = create_random_file(tmp)
+        self.assertTrue(str(dotfile1) != '')
+        fcontent2, _ = create_random_file(tmp)
         dst2 = os.path.join(dst, get_string(6))
-        d2 = Dotfile(get_string(5), dst2, os.path.basename(f2))
-        with open(f2, 'w') as f:
-            f.write(self.TEMPLATE)
-        f3, _ = create_random_file(tmp, binary=True)
+        dotfile2 = Dotfile(get_string(5), dst2, os.path.basename(fcontent2))
+        with open(fcontent2, 'w', encoding='utf-8') as file:
+            file.write(self.TEMPLATE)
+        fcontent3, _ = create_random_file(tmp, binary=True)
         dst3 = os.path.join(dst, get_string(6))
-        d3 = Dotfile(get_string(5), dst3, os.path.basename(f3))
+        dotfile3 = Dotfile(get_string(5), dst3, os.path.basename(fcontent3))
 
         # create a directory dotfile
         dir1 = os.path.join(tmp, 'somedir')
         create_dir(dir1)
-        fd, _ = create_random_file(dir1)
+        fildfd, _ = create_random_file(dir1)
         dstd = os.path.join(dst, get_string(6))
         ddot = Dotfile(get_string(5), dstd, os.path.basename(dir1))
 
         # to test backup
-        f4, c4 = create_random_file(tmp)
+        fcontent4, _ = create_random_file(tmp)
         dst4 = os.path.join(dst, get_string(6))
-        d4 = Dotfile(key=get_string(6), dst=dst4, src=os.path.basename(f4))
-        with open(dst4, 'w') as f:
-            f.write(get_string(16))
+        dotfile4 = Dotfile(key=get_string(6),
+                           dst=dst4,
+                           src=os.path.basename(fcontent4))
+        with open(dst4, 'w',
+                  encoding='utf-8') as file:
+            file.write(get_string(16))
 
         # to test link
-        f5, c5 = create_random_file(tmp)
+        fcontent5, _ = create_random_file(tmp)
         dst5 = os.path.join(dst, get_string(6))
         self.addCleanup(clean, dst5)
-        d5 = Dotfile(get_string(6), dst5,
-                     os.path.basename(f5), link=LinkTypes.LINK)
+        dotfile5 = Dotfile(get_string(6), dst5,
+                           os.path.basename(fcontent5), link=LinkTypes.LINK)
 
         # create the dotfile directories in dotdrop
         dir1 = create_dir(os.path.join(tmp, get_string(6)))
@@ -133,7 +137,7 @@ exec bspwm
         sub2, _ = create_random_file(dir1)
         self.assertTrue(os.path.exists(sub2))
         # make up the dotfile
-        d6 = Dotfile(get_string(6), dst6, os.path.basename(dir1))
+        dotfile6 = Dotfile(get_string(6), dst6, os.path.basename(dir1))
 
         # to test symlink directories
         dir2 = create_dir(os.path.join(tmp, get_string(6)))
@@ -146,47 +150,52 @@ exec bspwm
         sub4, _ = create_random_file(dir2)
         self.assertTrue(os.path.exists(sub4))
         # make up the dotfile
-        d7 = Dotfile(get_string(6), dst7,
-                     os.path.basename(dir2), link=LinkTypes.LINK)
+        dotfile7 = Dotfile(get_string(6), dst7,
+                           os.path.basename(dir2), link=LinkTypes.LINK)
 
         # to test actions
         value = get_string(12)
         fact = '/tmp/action'
         self.addCleanup(clean, fact)
-        act1 = Action('testaction', 'post', 'echo "{}" > {}'.format(value,
-                                                                    fact))
-        f8, c8 = create_random_file(tmp)
+        act1 = Action('testaction', 'post', f'echo "{value}" > {fact}')
+        fcontent8, _ = create_random_file(tmp)
         dst8 = os.path.join(dst, get_string(6))
-        d8 = Dotfile(get_string(6), dst8, os.path.basename(f8), actions=[act1])
+        dotfile8 = Dotfile(get_string(6), dst8, os.path.basename(fcontent8),
+                           actions=[act1])
 
         # to test transformations
         trans1 = 'trans1'
         trans2 = 'trans2'
+        # pylint: disable=C0209
         cmd = 'cat {0} | sed \'s/%s/%s/g\' > {1}' % (trans1, trans2)
-        tr = Action('testtrans', 'post', cmd)
-        f9, c9 = create_random_file(tmp, content=trans1)
+        self.addCleanup(clean, trans2)
+        the_trans = Action('testtrans', 'post', cmd)
+        fcontent9, _ = create_random_file(tmp, content=trans1)
         dst9 = os.path.join(dst, get_string(6))
-        d9 = Dotfile(get_string(6), dst9, os.path.basename(f9), trans_r=[tr])
+        dotfile9 = Dotfile(get_string(6), dst9, os.path.basename(fcontent9),
+                           trans_r=[the_trans])
 
         # to test template
         f10, _ = create_random_file(tmp, content='{{@@ header() @@}}')
         dst10 = os.path.join(dst, get_string(6))
-        d10 = Dotfile(get_string(6), dst10, os.path.basename(f10))
+        dotfile10 = Dotfile(get_string(6), dst10, os.path.basename(f10))
 
         # generate the config and stuff
         profile = get_string(5)
         confpath = os.path.join(tmp, self.CONFIG_NAME)
-        dotfiles = [d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, ddot]
+        dotfiles = [dotfile1, dotfile2, dotfile3, dotfile4,
+                    dotfile5, dotfile6, dotfile7, dotfile8,
+                    dotfile9, dotfile10, ddot]
         self.fake_config(confpath, dotfiles,
-                         profile, tmp, [act1], [tr])
+                         profile, tmp, [act1], [the_trans])
         conf = Cfg(confpath, profile, debug=True)
         self.assertTrue(conf is not None)
 
         # install them
-        o = load_options(confpath, profile)
-        o.safe = False
-        o.install_showdiff = True
-        cmd_install(o)
+        opt = load_options(confpath, profile)
+        opt.safe = False
+        opt.install_showdiff = True
+        cmd_install(opt)
 
         # now compare the generated files
         self.assertTrue(os.path.exists(dst1))
@@ -197,39 +206,47 @@ exec bspwm
         self.assertTrue(os.path.exists(dst7))
         self.assertTrue(os.path.exists(dst8))
         self.assertTrue(os.path.exists(dst10))
-        self.assertTrue(os.path.exists(fd))
+        self.assertTrue(os.path.exists(fildfd))
 
         # check if 'dst5' is a link whose target is 'f5'
         self.assertTrue(os.path.islink(dst5))
-        self.assertTrue(os.path.realpath(dst5) == os.path.realpath(f5))
+        self.assertTrue(os.path.realpath(dst5) == os.path.realpath(fcontent5))
 
         # check if 'dst7' is a link whose target is 'dir2'
         self.assertTrue(os.path.islink(dst7))
         self.assertTrue(os.path.realpath(dst7) == os.path.realpath(dir2))
 
         # make sure backup is there
-        b = dst4 + BACKUP_SUFFIX
-        self.assertTrue(os.path.exists(b))
+        backupf = dst4 + BACKUP_SUFFIX
+        self.assertTrue(os.path.exists(backupf))
 
-        self.assertTrue(filecmp.cmp(f1, dst1, shallow=True))
-        f2content = open(dst2, 'r').read()
+        self.assertTrue(filecmp.cmp(fcontent1, dst1, shallow=True))
+        f2content = ''
+        with open(dst2, 'r', encoding='utf-8') as file:
+            f2content = file.read()
         self.assertTrue(f2content == self.RESULT)
-        self.assertTrue(filecmp.cmp(f3, dst3, shallow=True))
+        self.assertTrue(filecmp.cmp(fcontent3, dst3, shallow=True))
 
         # test action has been executed
         self.assertTrue(os.path.exists(fact))
         self.assertTrue(str(act1) != '')
-        actcontent = open(fact, 'r').read().rstrip()
+        actcontent = ''
+        with open(fact, 'r', encoding='utf-8') as file:
+            actcontent = file.read().rstrip()
         self.assertTrue(actcontent == value)
 
         # test transformation has been done
         self.assertTrue(os.path.exists(dst9))
-        transcontent = open(dst9, 'r').read().rstrip()
+        transcontent = ''
+        with open(dst9, 'r', encoding='utf-8') as file:
+            transcontent = file.read().rstrip()
         self.assertTrue(transcontent == trans2)
 
         # test template has been remplaced
         self.assertTrue(os.path.exists(dst10))
-        tempcontent = open(dst10, 'r').read().rstrip()
+        tempcontent = ''
+        with open(dst10, 'r', encoding='utf-8') as file:
+            tempcontent = file.read().rstrip()
         self.assertTrue(tempcontent == header())
 
     def test_install_import_configs(self):
@@ -251,7 +268,7 @@ exec bspwm
         imported_dotfile, _ = create_random_file(os.path.join(tmp, 'imported'))
         imported_dotfile = {
             'dst': os.path.join(dst, imported_dotfile),
-            'key': 'f_{}'.format(imported_dotfile),
+            'key': f'f_{imported_dotfile}',
             'name': imported_dotfile,
             'src': os.path.join(tmp, 'imported', imported_dotfile),
         }
@@ -259,7 +276,7 @@ exec bspwm
             create_random_file(os.path.join(tmp, 'importing'))
         importing_dotfile = {
             'dst': os.path.join(dst, importing_dotfile),
-            'key': 'f_{}'.format(importing_dotfile),
+            'key': f'f_{importing_dotfile}',
             'name': importing_dotfile,
             'src': os.path.join(tmp, 'imported', importing_dotfile),
         }
@@ -323,11 +340,11 @@ exec bspwm
         })
 
         # install them
-        o = load_options(importing_path, 'host2')
-        o.safe = False
-        o.install_showdiff = True
-        o.variables = {}
-        cmd_install(o)
+        opt = load_options(importing_path, 'host2')
+        opt.safe = False
+        opt.install_showdiff = True
+        opt.variables = {}
+        cmd_install(opt)
 
         # now compare the generated files
         self.assertTrue(os.path.exists(importing_dotfile['dst']))
@@ -355,8 +372,8 @@ exec bspwm
 
         # Ensure all destination files point to source
         for src in srcs:
-            dst = os.path.join(dst_dir, src)
-            self.assertEqual(os.path.realpath(dst), os.path.realpath(src))
+            xyz = os.path.join(dst_dir, src)
+            self.assertEqual(os.path.realpath(xyz), os.path.realpath(src))
 
     def test_fails_without_src(self):
         """test fails without src"""
@@ -372,8 +389,8 @@ exec bspwm
                                      actionexec=None)
 
         self.assertFalse(res)
-        e = 'source dotfile does not exist: {}'.format(src)
-        self.assertEqual(err, e)
+        exp = f'source dotfile does not exist: {src}'
+        self.assertEqual(err, exp)
 
     def test_fails_when_src_file(self):
         """test fails when src file"""
@@ -397,8 +414,8 @@ exec bspwm
 
         # ensure nothing performed
         self.assertFalse(res)
-        e = 'source dotfile is not a directory: {}'.format(src)
-        self.assertEqual(err, e)
+        exp = f'source dotfile is not a directory: {src}'
+        self.assertEqual(err, exp)
 
     def test_creates_dst(self):
         """test creates dst"""
@@ -435,7 +452,7 @@ exec bspwm
 
         # Create destination file to be replaced
         dst = os.path.join(dst_dir, get_string(6))
-        with open(dst, 'w'):
+        with open(dst, 'w', encoding='utf=8'):
             pass
         self.assertTrue(os.path.isfile(dst))
 
@@ -457,8 +474,7 @@ exec bspwm
 
         # ensure prompted
         ask.assert_called_with(
-            'Remove regular file {} and replace with empty directory?'
-            .format(dst))
+            f'Remove regular file {dst} and replace with empty directory?')
 
     def test_runs_templater(self):
         """test runs templater"""
@@ -484,15 +500,16 @@ exec bspwm
                           linktype=LinkTypes.LINK_CHILDREN, actionexec=None)
 
         for src in srcs:
-            dst = os.path.join(dst_dir, os.path.basename(src))
+            xyz = os.path.join(dst_dir, os.path.basename(src))
 
             # ensure dst is link
-            self.assertTrue(os.path.islink(dst))
+            self.assertTrue(os.path.islink(xyz))
             # ensure dst not directly linked to src
-            self.assertNotEqual(os.path.realpath(dst), src)
+            self.assertNotEqual(os.path.realpath(xyz), src)
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_jhelpers.py b/tests/test_jhelpers.py
index 114d9bb..df57a3d 100644
--- a/tests/test_jhelpers.py
+++ b/tests/test_jhelpers.py
@@ -6,16 +6,16 @@ basic unittest for jhelpers
 
 import os
 import unittest
-
-from dotdrop.cfg_aggregator import CfgAggregator
 from tests.helpers import (clean,
                            create_random_file, get_string, get_tempdir,
                            load_options)
+from dotdrop.cfg_aggregator import CfgAggregator
 from dotdrop.dotfile import Dotfile
 from dotdrop.dotdrop import cmd_install
 
 
 class TestJhelpers(unittest.TestCase):
+    """test case"""
 
     CONFIG_NAME = 'config.yaml'
 
@@ -58,19 +58,19 @@ dirname: /tmp/a/b
 
     def fake_config(self, path, dotfile, profile, dotpath):
         """Create a fake config file"""
-        with open(path, 'w') as f:
-            f.write('config:\n')
-            f.write('  backup: true\n')
-            f.write('  create: true\n')
-            f.write('  dotpath: {}\n'.format(dotpath))
-            f.write('dotfiles:\n')
-            f.write('  {}:\n'.format(dotfile.key))
-            f.write('    dst: {}\n'.format(dotfile.dst))
-            f.write('    src: {}\n'.format(dotfile.src))
-            f.write('profiles:\n')
-            f.write('  {}:\n'.format(profile))
-            f.write('    dotfiles:\n')
-            f.write('    - {}\n'.format(dotfile.key))
+        with open(path, 'w', encoding='utf-8') as file:
+            file.write('config:\n')
+            file.write('  backup: true\n')
+            file.write('  create: true\n')
+            file.write(f'  dotpath: {dotpath}\n')
+            file.write('dotfiles:\n')
+            file.write(f'  {dotfile.key}:\n')
+            file.write(f'    dst: {dotfile.dst}\n')
+            file.write(f'    src: {dotfile.src}\n')
+            file.write('profiles:\n')
+            file.write(f'  {profile}:\n')
+            file.write('    dotfiles:\n')
+            file.write(f'    - {dotfile.key}\n')
         return path
 
     def test_jhelpers(self):
@@ -87,34 +87,37 @@ dirname: /tmp/a/b
         self.addCleanup(clean, dst)
 
         # create the dotfile in dotdrop
-        f1, c1 = create_random_file(tmp)
-        with open(f1, 'w') as f:
-            f.write(self.TEMPLATE)
+        file1, _ = create_random_file(tmp)
+        with open(file1, 'w', encoding='utf-8') as file:
+            file.write(self.TEMPLATE)
         dst1 = os.path.join(dst, get_string(6))
-        d1 = Dotfile(get_string(5), dst1, os.path.basename(f1))
+        dotfile1 = Dotfile(get_string(5), dst1, os.path.basename(file1))
 
         # generate the config and stuff
         profile = get_string(5)
         confpath = os.path.join(tmp, self.CONFIG_NAME)
-        self.fake_config(confpath, d1, profile, tmp)
+        self.fake_config(confpath, dotfile1, profile, tmp)
         conf = CfgAggregator(confpath, profile, debug=True)
         self.assertTrue(conf is not None)
 
         # install them
-        o = load_options(confpath, profile)
-        o.safe = False
-        o.install_showdiff = True
-        o.variables = {}
-        o.debug = True
-        cmd_install(o)
+        opt = load_options(confpath, profile)
+        opt.safe = False
+        opt.install_showdiff = True
+        opt.variables = {}
+        opt.debug = True
+        cmd_install(opt)
 
         # now compare the generated files
         self.assertTrue(os.path.exists(dst1))
-        f1content = open(dst1, 'r').read()
+        f1content = ''
+        with open(dst1, 'r', encoding='utf-8') as file:
+            f1content = file.read()
         self.assertTrue(f1content == self.RESULT)
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_listings.py b/tests/test_listings.py
index e568ad7..a81cbf5 100644
--- a/tests/test_listings.py
+++ b/tests/test_listings.py
@@ -49,23 +49,23 @@ class TestListings(unittest.TestCase):
         self.addCleanup(clean, dotfilespath)
 
         # create the dotfiles to test
-        d1, c1 = create_random_file(fold_config)
-        self.assertTrue(os.path.exists(d1))
-        self.addCleanup(clean, d1)
-        d2, c2 = create_random_file(fold_subcfg)
-        self.assertTrue(os.path.exists(d2))
-        self.addCleanup(clean, d2)
-        d3, c3 = create_random_file(fold_tmp)
-        self.assertTrue(os.path.exists(d3))
-        self.addCleanup(clean, d3)
-        d4, c4 = create_random_file(fold_tmp, binary=True)
-        self.assertTrue(os.path.exists(d4))
-        self.addCleanup(clean, d4)
-        d5 = get_tempdir()
-        self.assertTrue(os.path.exists(d5))
-        self.addCleanup(clean, d5)
-        d6, _ = create_random_file(d5)
-        self.assertTrue(os.path.exists(d6))
+        file1, _ = create_random_file(fold_config)
+        self.assertTrue(os.path.exists(file1))
+        self.addCleanup(clean, file1)
+        file2, _ = create_random_file(fold_subcfg)
+        self.assertTrue(os.path.exists(file2))
+        self.addCleanup(clean, file2)
+        file3, _ = create_random_file(fold_tmp)
+        self.assertTrue(os.path.exists(file3))
+        self.addCleanup(clean, file3)
+        file4, _ = create_random_file(fold_tmp, binary=True)
+        self.assertTrue(os.path.exists(file4))
+        self.addCleanup(clean, file4)
+        file5 = get_tempdir()
+        self.assertTrue(os.path.exists(file5))
+        self.addCleanup(clean, file5)
+        file6, _ = create_random_file(file5)
+        self.assertTrue(os.path.exists(file6))
 
         # create the config file
         profile = get_string(5)
@@ -75,29 +75,30 @@ class TestListings(unittest.TestCase):
                                       backup=self.CONFIG_BACKUP,
                                       create=self.CONFIG_CREATE)
         self.assertTrue(os.path.exists(confpath))
-        o = load_options(confpath, profile)
-        dfiles = [d1, d2, d3, d4, d5]
+        opt = load_options(confpath, profile)
+        dfiles = [file1, file2, file3, file4, file5]
 
         # import the files
-        o.import_path = dfiles
-        cmd_importer(o)
-        o = load_options(confpath, profile)
+        opt.import_path = dfiles
+        cmd_importer(opt)
+        opt = load_options(confpath, profile)
 
         # files
-        cmd_list_profiles(o)
+        cmd_list_profiles(opt)
 
         # list files
-        o.files_templateonly = False
-        cmd_files(o)
-        o.files_templateonly = True
-        cmd_files(o)
+        opt.files_templateonly = False
+        cmd_files(opt)
+        opt.files_templateonly = True
+        cmd_files(opt)
 
         # details
-        o.detail_keys = None
-        cmd_detail(o)
+        opt.detail_keys = None
+        cmd_detail(opt)
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_remove.py b/tests/test_remove.py
index 2c8d262..d287058 100644
--- a/tests/test_remove.py
+++ b/tests/test_remove.py
@@ -15,6 +15,7 @@ from tests.helpers import (clean, create_dir,
 
 
 class TestRemove(unittest.TestCase):
+    """test case"""
 
     def load_yaml(self, path):
         """Load yaml to dict"""
@@ -68,13 +69,13 @@ class TestRemove(unittest.TestCase):
         }
 
         yaml_dump(configdic, confpath)
-        o = load_options(confpath, 'host1')
-        o.remove_path = ['f_test1']
-        o.remove_iskey = True
-        o.debug = True
-        o.safe = False
+        opt = load_options(confpath, 'host1')
+        opt.remove_path = ['f_test1']
+        opt.remove_iskey = True
+        opt.debug = True
+        opt.safe = False
         # by key
-        cmd_remove(o)
+        cmd_remove(opt)
 
         # ensure file is deleted
         self.assertFalse(os.path.exists(df1))
@@ -82,48 +83,49 @@ class TestRemove(unittest.TestCase):
         self.assertTrue(os.path.exists(df3))
 
         # load dict
-        y = yaml_load(confpath)
+        cont = yaml_load(confpath)
 
         # ensure not present
-        self.assertTrue('f_test1' not in y['dotfiles'])
-        self.assertTrue('f_test1' not in y['profiles']['host1']['dotfiles'])
-        self.assertTrue('host2' not in y['profiles'])
+        self.assertTrue('f_test1' not in cont['dotfiles'])
+        self.assertTrue('f_test1' not in cont['profiles']['host1']['dotfiles'])
+        self.assertTrue('host2' not in cont['profiles'])
 
         # assert rest is intact
-        self.assertTrue('f_test2' in y['dotfiles'].keys())
-        self.assertTrue('f_test3' in y['dotfiles'].keys())
-        self.assertTrue('f_test2' in y['profiles']['host1']['dotfiles'])
-        self.assertTrue('f_test3' in y['profiles']['host1']['dotfiles'])
-        self.assertTrue(y['profiles']['host3']['dotfiles'] == ['f_test2'])
+        self.assertTrue('f_test2' in cont['dotfiles'].keys())
+        self.assertTrue('f_test3' in cont['dotfiles'].keys())
+        self.assertTrue('f_test2' in cont['profiles']['host1']['dotfiles'])
+        self.assertTrue('f_test3' in cont['profiles']['host1']['dotfiles'])
+        self.assertTrue(cont['profiles']['host3']['dotfiles'] == ['f_test2'])
 
-        o = load_options(confpath, 'host1')
-        o.remove_path = ['/tmp/some-fake-path']
-        o.remove_iskey = False
-        o.debug = True
-        o.safe = False
+        opt = load_options(confpath, 'host1')
+        opt.remove_path = ['/tmp/some-fake-path']
+        opt.remove_iskey = False
+        opt.debug = True
+        opt.safe = False
         # by path
-        cmd_remove(o)
+        cmd_remove(opt)
 
         # ensure file is deleted
         self.assertTrue(os.path.exists(df2))
         self.assertFalse(os.path.exists(df3))
 
         # load dict
-        y = yaml_load(confpath)
+        cont = yaml_load(confpath)
 
         # ensure not present
-        self.assertTrue('f_test3' not in y['dotfiles'])
-        self.assertTrue('f_test3' not in y['profiles']['host1']['dotfiles'])
+        self.assertTrue('f_test3' not in cont['dotfiles'])
+        self.assertTrue('f_test3' not in cont['profiles']['host1']['dotfiles'])
 
         # assert rest is intact
-        self.assertTrue('host1' in y['profiles'].keys())
-        self.assertFalse('host2' in y['profiles'].keys())
-        self.assertTrue('host3' in y['profiles'].keys())
-        self.assertTrue(y['profiles']['host1']['dotfiles'] == ['f_test2'])
-        self.assertTrue(y['profiles']['host3']['dotfiles'] == ['f_test2'])
+        self.assertTrue('host1' in cont['profiles'].keys())
+        self.assertFalse('host2' in cont['profiles'].keys())
+        self.assertTrue('host3' in cont['profiles'].keys())
+        self.assertTrue(cont['profiles']['host1']['dotfiles'] == ['f_test2'])
+        self.assertTrue(cont['profiles']['host3']['dotfiles'] == ['f_test2'])
 
 
 def main():
+    """entry point"""
     unittest.main()
 
 
diff --git a/tests/test_update.py b/tests/test_update.py
index ffaaf62..834b683 100644
--- a/tests/test_update.py
+++ b/tests/test_update.py
@@ -47,13 +47,13 @@ class TestUpdate(unittest.TestCase):
         self.addCleanup(clean, dotfilespath)
 
         # create the dotfiles to test
-        d1, _ = create_random_file(fold_config)
-        self.assertTrue(os.path.exists(d1))
-        self.addCleanup(clean, d1)
+        dotfilefile1, _ = create_random_file(fold_config)
+        self.assertTrue(os.path.exists(dotfilefile1))
+        self.addCleanup(clean, dotfilefile1)
 
-        d2, _ = create_random_file(fold_config)
-        self.assertTrue(os.path.exists(d2))
-        self.addCleanup(clean, d2)
+        dotfilefile2, _ = create_random_file(fold_config)
+        self.assertTrue(os.path.exists(dotfilefile2))
+        self.addCleanup(clean, dotfilefile2)
 
         # template
         d3t, _ = create_random_file(fold_config)
@@ -96,7 +96,7 @@ class TestUpdate(unittest.TestCase):
         self.assertTrue(os.path.exists(confpath))
         opt = load_options(confpath, profile)
         opt.update_showpatch = True
-        dfiles = [d1, dir1, d2, d3t, dsubstmp]
+        dfiles = [dotfilefile1, dir1, dotfilefile2, d3t, dsubstmp]
 
         # import the files
         opt.import_path = dfiles
@@ -138,7 +138,7 @@ class TestUpdate(unittest.TestCase):
         self.assertFalse(os.path.exists(gone))
 
         # edit the files
-        edit_content(d1, 'newcontent')
+        edit_content(dotfilefile1, 'newcontent')
         edit_content(dirf1, 'newcontent')
 
         # add more file
@@ -150,12 +150,12 @@ class TestUpdate(unittest.TestCase):
         create_random_file(dpath)
 
         # update it
-        opt.update_path = [d1, dir1]
+        opt.update_path = [dotfilefile1, dir1]
         cmd_update(opt)
 
         # test content
         newcontent = ''
-        with open(d1, 'r', encoding='utf-8') as file:
+        with open(dotfilefile1, 'r', encoding='utf-8') as file:
             newcontent = file.read()
         self.assertTrue(newcontent == 'newcontent')
         newcontent = ''
@@ -163,14 +163,14 @@ class TestUpdate(unittest.TestCase):
             newcontent = file.read()
         self.assertTrue(newcontent == 'newcontent')
 
-        edit_content(d2, 'newcontentbykey')
+        edit_content(dotfilefile2, 'newcontentbykey')
 
         # update it by key
         dfiles = opt.dotfiles
         d2key = ''
         for dotfile in dfiles:
             src = os.path.expanduser(dotfile.dst)
-            if src == d2:
+            if src == dotfilefile2:
                 d2key = dotfile.key
                 break
         self.assertTrue(d2key != '')
@@ -180,7 +180,7 @@ class TestUpdate(unittest.TestCase):
 
         # test content
         newcontent = ''
-        with open(d2, 'r', encoding='utf-8') as file:
+        with open(dotfilefile2, 'r', encoding='utf-8') as file:
             newcontent = file.read()
         self.assertTrue(newcontent == 'newcontentbykey')
 
diff --git a/tests/test_yamlcfg.py b/tests/test_yamlcfg.py
index 2713ef7..1b61e74 100644
--- a/tests/test_yamlcfg.py
+++ b/tests/test_yamlcfg.py
@@ -19,6 +19,7 @@ from tests.helpers import (SubsetTestCase, _fake_args, clean,
 
 
 class TestConfig(SubsetTestCase):
+    """test case"""
 
     CONFIG_BACKUP = False
     CONFIG_CREATE = True
@@ -52,6 +53,8 @@ class TestConfig(SubsetTestCase):
         self.assertTrue(conf.dump() != '')
 
     def test_def_link(self):
+        """unittest"""
+        # pylint: disable=E1120
         self._test_link_import('nolink', LinkTypes.ABSOLUTE, 'absolute')
         self._test_link_import('nolink', LinkTypes.RELATIVE, 'relative')
         self._test_link_import('nolink', LinkTypes.NOLINK, 'nolink')
@@ -75,7 +78,7 @@ class TestConfig(SubsetTestCase):
     @patch('dotdrop.cfg_yaml.os.path.exists', create=True)
     def _test_link_import(self, cfgstring, expected,
                           cliargs, mock_exists, mock_open):
-        data = '''
+        data = f'''
 config:
   backup: true
   create: true
@@ -83,11 +86,11 @@ config:
   banner: true
   longkey: false
   keepdot: false
-  link_on_import: {}
+  link_on_import: {cfgstring}
   link_dotfile_default: nolink
 dotfiles:
 profiles:
-        '''.format(cfgstring)
+        '''
 
         mock_open.side_effect = [
                 unittest.mock.mock_open(read_data=data).return_value,
@@ -100,14 +103,14 @@ profiles:
         args['--cfg'] = 'mocked'
         args['--link'] = cliargs
         args['--verbose'] = True
-        o = Options(args=args)
+        opt = Options(args=args)
 
-        self.assertTrue(o.import_link == expected)
+        self.assertTrue(opt.import_link == expected)
 
     @patch('dotdrop.cfg_yaml.open', create=True)
     @patch('dotdrop.cfg_yaml.os.path.exists', create=True)
     def _test_link_import_fail(self, value, mock_exists, mock_open):
-        data = '''
+        data = f'''
 config:
   backup: true
   create: true
@@ -115,11 +118,11 @@ config:
   banner: true
   longkey: false
   keepdot: false
-  link_on_import: {}
+  link_on_import: {value}
   link_dotfile_default: nolink
 dotfiles:
 profiles:
-        '''.format(value)
+        '''
 
         mock_open.side_effect = [
                 unittest.mock.mock_open(read_data=data).return_value
@@ -132,10 +135,11 @@ profiles:
         args['--verbose'] = True
 
         with self.assertRaises(YamlException):
-            o = Options(args=args)
-            print(o.import_link)
+            opt = Options(args=args)
+            print(opt.import_link)
 
     def test_include(self):
+        """unittest"""
         tmp = get_tempdir()
         self.assertTrue(os.path.exists(tmp))
         self.addCleanup(clean, tmp)
@@ -358,32 +362,32 @@ profiles:
         self.assertIsNotNone(imported_cfg)
 
         # test profiles
-        self.assertIsSubset(imported_cfg.profiles,
-                            importing_cfg.profiles)
+        self.assert_is_subset(imported_cfg.profiles,
+                              importing_cfg.profiles)
 
         # test dotfiles
-        self.assertIsSubset(imported_cfg.dotfiles, importing_cfg.dotfiles)
+        self.assert_is_subset(imported_cfg.dotfiles, importing_cfg.dotfiles)
 
         # test actions
         pre_ed = post_ed = pre_ing = post_ing = {}
-        for k, v in imported_cfg.actions.items():
-            kind, _ = v
+        for k, val in imported_cfg.actions.items():
+            kind, _ = val
             if kind == 'pre':
-                pre_ed[k] = v
+                pre_ed[k] = val
             elif kind == 'post':
-                post_ed[k] = v
-        for k, v in importing_cfg.actions.items():
-            kind, _ = v
+                post_ed[k] = val
+        for k, val in importing_cfg.actions.items():
+            kind, _ = val
             if kind == 'pre':
-                pre_ing[k] = v
+                pre_ing[k] = val
             elif kind == 'post':
-                post_ing[k] = v
-        self.assertIsSubset(pre_ed, pre_ing)
-        self.assertIsSubset(post_ed, post_ing)
+                post_ing[k] = val
+        self.assert_is_subset(pre_ed, pre_ing)
+        self.assert_is_subset(post_ed, post_ing)
 
         # test transactions
-        self.assertIsSubset(imported_cfg.trans_r, importing_cfg.trans_r)
-        self.assertIsSubset(imported_cfg.trans_w, importing_cfg.trans_w)
+        self.assert_is_subset(imported_cfg.trans_r, importing_cfg.trans_r)
+        self.assert_is_subset(imported_cfg.trans_w, importing_cfg.trans_w)
 
         # test variables
         imported_vars = {
@@ -396,10 +400,10 @@ profiles:
             for k, v in importing_cfg.variables.items()
             if not k.startswith('_')
         }
-        self.assertIsSubset(imported_vars, importing_vars)
+        self.assert_is_subset(imported_vars, importing_vars)
 
         # test prodots
-        self.assertIsSubset(imported_cfg.profiles, importing_cfg.profiles)
+        self.assert_is_subset(imported_cfg.profiles, importing_cfg.profiles)
 
     def test_import_configs_override(self):
         """Test import_configs when some config keys overlap."""
@@ -563,8 +567,8 @@ profiles:
         self.assertIsNotNone(imported_cfg)
 
         # test profiles
-        self.assertIsSubset(imported_cfg.profiles,
-                            importing_cfg.profiles)
+        self.assert_is_subset(imported_cfg.profiles,
+                              importing_cfg.profiles)
 
         # test dotfiles
         self.assertEqual(importing_cfg.dotfiles['f_vimrc'],
@@ -609,6 +613,7 @@ profiles:
 
 
 def main():
+    """entry point"""
     unittest.main()