Added tests for apply changes method

tests/test_wolverine.py

@@ -0,0 +1,54 @@
+import os
+import pytest
+import tempfile
+from wolverine import apply_changes
+
+
+@pytest.fixture(scope='function')
+def temp_file():
+    # Create a temporary file
+    with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
+        f.write("first line\nsecond line\nthird line")
+    file_path = f.name
+    yield file_path
+    # Clean up the temporary file
+    os.remove(file_path)
+
+
+def test_apply_changes_replace(temp_file):
+    # Make a "replace" change to the second line
+    changes = [
+        {"operation": "Replace", "line": 2, "content": "new second line"}
+    ]
+    apply_changes(temp_file, changes)
+
+    # Check that the file was updated correctly
+    with open(temp_file) as f:
+        content = f.read()
+        assert content == "first line\nnew second line\nthird line"
+
+
+def test_apply_changes_delete(temp_file):
+    # Make a "delete" change to the third line
+    changes = [
+        {"operation": "Delete", "line": 3},
+    ]
+    apply_changes(temp_file, changes)
+
+    # Check that the file was updated correctly
+    with open(temp_file) as f:
+        content = f.read()
+        assert content == "first line\nsecond line"
+
+
+def test_apply_changes_insert(temp_file):
+    # Make an "insert" change after the second line
+    changes = [
+        {"operation": "InsertAfter", "line": 2, "content": "inserted line"},
+    ]
+    apply_changes(temp_file, changes)
+
+    # Check that the file was updated correctly
+    with open(temp_file) as f:
+        content = f.read()
+        assert content == "first line\nsecond line\ninserted line"