Test: Add test for specific-common-specific content and refactor fixtures

This commit adds a new test, `test__exclude_common_contents__specific_common_specific`, to verify that the `exclude_common_contents` function correctly handles the case where specific content is present both before and after a common content block.

To support this test, the following changes were made:

- Added `readme_content_specific_common_specific` fixture: This fixture generates README content with specific content before and after a common content block.
- Refactored `readme_content_double` fixture: This fixture now reuses the `readme_content_specific_common_specific` fixture to generate its content, improving code reuse and reducing duplication.

The new test asserts that the specific lines from both sections are preserved in the output, while the common lines are removed. This ensures that the function correctly handles the specific-common-specific scenario.

Author: beachdweller

tests/test_ai_tutor.py

@@ -377,6 +377,47 @@ def specific_lines_2() -> Tuple[str]:
     )
 
 
+@pytest.fixture
+def readme_content_specific_common_specific(
+    readme_content_single:str,
+    specific_lines_2:Tuple[str],
+) -> str:
+    return (
+        readme_content_single
+        + '\n'.join(specific_lines_2) + '\n'
+    )
+
+
+def test__exclude_common_contents__specific_common_specific(
+    readme_content_specific_common_specific:str,
+    start_marker:str,
+    end_marker:str,
+    specific_lines:Tuple[str],
+    common_lines:Tuple[str],
+    specific_lines_2:Tuple[str],
+):
+    result = ai_tutor.exclude_common_contents(
+        readme_content=readme_content_specific_common_specific,
+        common_content_start_marker=start_marker,
+        common_content_end_marker=end_marker,
+    )
+
+    for line in (specific_lines + specific_lines_2):
+        assert line.strip() in result, ("\n"
+            f"Could not find line: {line}\n"
+            f"in result: {result}."
+        )
+
+    for line in common_lines:
+        assert line.strip() not in result, ("\n"
+            f"Found line: {line}\n"
+            f"in result: {result}."
+        )
+
+    assert start_marker.strip() not in result
+    assert end_marker.strip() not in result
+
+
 @pytest.fixture
 def common_lines_2() -> Tuple[str]:
     return (
@@ -387,15 +428,13 @@ def common_lines_2() -> Tuple[str]:
 
 @pytest.fixture
 def readme_content_double(
-    readme_content_single:str,
-    specific_lines_2:Tuple[str],
+    readme_content_specific_common_specific:str,
     start_marker:str,
     common_lines_2:Tuple[str],
     end_marker:str
 ) -> str:
     return (
-        readme_content_single
-        + '\n'.join(specific_lines_2) + '\n'
+        readme_content_specific_common_specific
         + create_common_block(start_marker, common_lines_2, end_marker)
     )