Add tests for app/print_table.py (#15)

* Add tests for app/print_table.py

* Exclude app/version and app/args from coverage

* Remove app/main from coverage (just uses other modules)

app/main.py

@@ -7,7 +7,7 @@ import sys
 from app.args import parse_args
 from app.print_table import print_table, generate_prefix_string
 from app.query_normalisation import is_ip_address, resolve_domain_name
-from app.ip_info import (  # pragma: no cover
+from app.ip_info import (
     get_ip_information,
     get_autonomous_system_number,
     get_prefix_information,

app/print_table.py

@@ -18,6 +18,6 @@ def generate_prefix_string(prefixes: list) -> Union[str, None]:
         return None
 
 
-def print_table(table_data) -> None:
+def print_table(table_data) -> None:  # pragma: no cover
     """Print table generated by tabulate."""
     print(tabulate(table_data))

sonar-project.properties

@@ -6,3 +6,4 @@ sonar.python.xunit.reportPath=testresults.xml
 sonar.sources=app
 sonar.tests=tests
 sonar.exclusions=,.github/**,.gitignore,CODEOWNERS,CHANGELOG.md,LICENSE.md,README.md,renovate.json,requirements-dev.txt,requirements.txt
+sonar.coverage.exclusions=app/_version.py,app/args.py,app/main.py

tests/test_print_table.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+"""MODULE: Provides test cases for app/print_table.py."""
+
+from app.print_table import generate_prefix_string  # pragma: no cover
+
+
+def test_generate_prefix_string_small() -> None:
+    """TEST: Verifies if a small prefix list results in one line."""
+    test_query = ["abc", "def"]
+    result = generate_prefix_string(prefixes=test_query)
+    assert result == "abc, def\n"
+
+
+def test_generate_prefix_string_large() -> None:
+    """TEST: Verifies if a large prefix list results in multiple lines."""
+    test_query = ["abc", "def", "ghi", "jkl", "mno", "pqr"]
+    result = generate_prefix_string(prefixes=test_query)
+    assert result == "abc, def, ghi, jkl\nmno, pqr\n"