Add tests for escape_regex_special_chars function

tests/test_escape_regex.py

@@ -0,0 +1,36 @@
+"""Tests for the escape_regex_special_chars function in common.py"""
+
+import pytest
+from common import escape_regex_special_chars
+
+
+@pytest.mark.parametrize(
+    "input_text, expected_output",
+    [
+        # Special regex characters that should be escaped
+        ("file.name", "file\\.name"),
+        ("file*name", "file\\*name"),
+        ("file+name", "file\\+name"),
+        ("file?name", "file\\?name"),
+        ("file(name)", "file\\(name\\)"),
+        ("file[name]", "file\\[name\\]"),
+        ("file{name}", "file\\{name\\}"),
+        ("file^name", "file\\^name"),
+        ("file$name", "file\\$name"),
+        ("file|name", "file\\|name"),
+
+        # Normal text (no special characters)
+        ("normal_text", "normal_text"),
+        ("hello world", "hello\\ world"),
+
+        # Edge cases
+        ("", ""),
+        ("a", "a"),
+        ("123", "123"),
+    ],
+)
+def test_escape_regex_special_chars(input_text, expected_output):
+    """Test that escape_regex_special_chars correctly escapes regex special characters."""
+    result = escape_regex_special_chars(input_text)
+    assert result == expected_output
+