Refactor test

tests/test_impls.py

@@ -24,6 +24,13 @@
 )
 @patch("rapids_build_backend.impls._get_git_commit", Mock(return_value="abc123"))
 def test_edit_git_commit(commit_file_type, initial_contents, expected_contents):
+    def check_initial_contents(filename):
+        if initial_contents is not None:
+            with open(filename) as f:
+                assert f.read() == initial_contents
+        else:
+            assert not os.path.exists(filename)
+
     with tempfile.TemporaryDirectory() as d:
         commit_file = os.path.join(d, "commit-file")
         if initial_contents is not None:
@@ -44,15 +51,8 @@ def test_edit_git_commit(commit_file_type, initial_contents, expected_contents):
             with _edit_git_commit(config):
                 with open(commit_file) as f:
                     assert f.read() == expected_contents
-                bkp_file = os.path.join(d, ".commit-file.rapids-build-backend.bak")
-                if initial_contents is not None:
-                    with open(bkp_file) as f:
-                        assert f.read() == initial_contents
-                else:
-                    assert not os.path.exists(bkp_file)
+                check_initial_contents(
+                    os.path.join(d, ".commit-file.rapids-build-backend.bak")
+                )
 
-        if initial_contents is not None:
-            with open(commit_file) as f:
-                assert f.read() == initial_contents
-        else:
-            assert not os.path.exists(commit_file)
+        check_initial_contents(commit_file)