fix: resolve CI issues - push complete implementation with tests

tests/test_diff_parser.py

@@ -1,5 +1,3 @@
-"""Tests for the DiffParser module."""
-
 import sys
 from pathlib import Path
 
@@ -10,10 +8,7 @@ from gdiffer.parser import parse_diff
 
 
 class TestDiffParser:
-    """Tests for DiffParser class."""
-
     def test_parse_simple_diff(self, diff_parser, sample_diff):
-        """Test parsing a simple diff."""
         files = diff_parser.parse(sample_diff)
 
         assert len(files) == 1
@@ -21,7 +16,6 @@ class TestDiffParser:
         assert len(files[0].hunks) == 1
 
     def test_parse_new_file(self, diff_parser):
-        """Test parsing diff with new file."""
         diff = """diff --git a/new_file.py b/new_file.py
 new file mode 100644
 index 0000000..1234567
@@ -39,7 +33,6 @@ index 0000000..1234567
         assert files[0].new_file_mode == "100644"
 
     def test_parse_deleted_file(self, diff_parser):
-        """Test parsing diff with deleted file."""
         diff = """diff --git a/old_file.py b/old_file.py
 deleted file mode 100644
 index 1234567..0000000
@@ -57,7 +50,6 @@ index 1234567..0000000
         assert files[0].change_type == "delete"
 
     def test_parse_rename(self, diff_parser):
-        """Test parsing diff with renamed file."""
         diff = """diff --git a/old_name.py b/new_name.py
 similarity index 95%
 rename from old_name.py
@@ -79,7 +71,6 @@ index 1234567..89abcde 100644
         assert files[0].change_type == "rename"
 
     def test_parse_multi_file(self, diff_parser, multi_file_diff):
-        """Test parsing diff with multiple files."""
         files = diff_parser.parse(multi_file_diff)
 
         assert len(files) == 3
@@ -90,7 +81,6 @@ index 1234567..89abcde 100644
         assert "modify" in file_types
 
     def test_hunk_parsing(self, diff_parser, sample_diff):
-        """Test that hunks are correctly parsed."""
         files = diff_parser.parse(sample_diff)
         file_obj = files[0]
 
@@ -103,7 +93,6 @@ index 1234567..89abcde 100644
         assert hunk.new_lines > 0
 
     def test_get_added_lines(self, diff_parser):
-        """Test getting added lines from hunk."""
         diff = """diff --git a/test.py b/test.py
 --- a/test.py
 +++ b/test.py
@@ -120,7 +109,6 @@ index 1234567..89abcde 100644
         assert len(added_lines) == 2
 
     def test_get_removed_lines(self, diff_parser):
-        """Test getting removed lines from hunk."""
         diff = """diff --git a/test.py b/test.py
 --- a/test.py
 +++ b/test.py
@@ -136,7 +124,6 @@ index 1234567..89abcde 100644
         assert len(removed_lines) == 1
 
     def test_file_extension(self, diff_parser):
-        """Test file extension detection."""
         diff_py = """diff --git a/test.py b/test.py
 --- a/test.py
 +++ b/test.py
@@ -159,12 +146,10 @@ index 1234567..89abcde 100644
         assert files_js[0].extension == "js"
 
     def test_empty_diff(self, diff_parser):
-        """Test parsing empty diff."""
         files = diff_parser.parse("")
         assert len(files) == 0
 
     def test_parse_diff_function(self):
-        """Test the parse_diff convenience function."""
         diff = """diff --git a/test.py b/test.py
 --- a/test.py
 +++ b/test.py
@@ -178,20 +163,15 @@ index 1234567..89abcde 100644
 
 
 class TestDiffFile:
-    """Tests for DiffFile model."""
-
     def test_filename_property(self):
-        """Test filename property returns correct value."""
         file_obj = DiffFile(old_path="old.py", new_path="new.py")
         assert file_obj.filename == "new.py"
 
     def test_filename_only_old_path(self):
-        """Test filename when only old path exists."""
         file_obj = DiffFile(old_path="old.py", new_path=None)
         assert file_obj.filename == "old.py"
 
     def test_is_new_property(self):
-        """Test is_new property."""
         file_obj = DiffFile(old_path=None, new_path="new.py", new_file_mode="100644")
         assert file_obj.is_new
 
@@ -199,12 +179,10 @@ class TestDiffFile:
         assert not file_obj2.is_new
 
     def test_is_deleted_property(self):
-        """Test is_deleted property."""
         file_obj = DiffFile(old_path="old.py", new_path=None, deleted_file_mode="100644")
         assert file_obj.is_deleted
 
     def test_is_rename_property(self):
-        """Test is_rename property."""
         file_obj = DiffFile(
             old_path="old.py",
             new_path="new.py",
@@ -215,10 +193,7 @@ class TestDiffFile:
 
 
 class TestDiffHunk:
-    """Tests for DiffHunk model."""
-
     def test_get_modified_lines(self):
-        """Test getting modified lines."""
         hunk = DiffHunk(
             old_start=1,
             old_lines=3,