diff --git a/tests/unit/test_git.py b/tests/unit/test_git.py
new file mode 100644
index 0000000..7929a27
--- /dev/null
+++ b/tests/unit/test_git.py
@@ -0,0 +1,43 @@
+import pytest
+from pathlib import Path
+import tempfile
+import os
+
+from src.git.git import GitRepo, FileChange
+
+
+class TestGitRepo:
+    def test_get_file_language(self):
+        repo = GitRepo(Path.cwd())
+        assert repo.get_file_language("test.py") == "python"
+        assert repo.get_file_language("test.js") == "javascript"
+        assert repo.get_file_language("test.go") == "go"
+        assert repo.get_file_language("test.rs") == "rust"
+        assert repo.get_file_language("test.unknown") == "unknown"
+
+    def test_get_diff_stats(self):
+        repo = GitRepo(Path.cwd())
+        diff = """diff --git a/test.py b/test.py
+--- a/test.py
++++ b/test.py
+@@ -1,3 +1,4 @@
+ def hello():
++    print("hello")
+     return True
+-    return False
+"""
+        additions, deletions = repo.get_diff_stats(diff)
+        assert additions == 1
+        assert deletions == 1
+
+
+class TestFileChange:
+    def test_file_change_creation(self):
+        change = FileChange(
+            filename="test.py",
+            status="M",
+            diff="diff content"
+        )
+        assert change.filename == "test.py"
+        assert change.status == "M"
+        assert change.diff == "diff content"