feature(tests): add unit tests

tests/test_img.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+"""Provides test cases for webexmemebot/img.py."""
+
+import pytest
+
+from app import img  # pragma: no cover
+
+
+def test_get_templates() -> None:
+    """Test to ensure that we can successfully contact the API."""
+    result = img.get_templates()
+    assert isinstance(result, list) and isinstance(result[0], dict)
+
+
+@pytest.mark.parametrize("test_input,expected", img.CHAR_REPLACEMENTS)
+def test_format_meme_string(test_input, expected):
+    """Test to ensure we correctly reformat special chars in the meme URL."""
+    test_str: str = f"abc{test_input}123"
+    assert img.format_meme_string(test_str) == f"abc{expected}123"