test: add coverage for check with 3+ files and Change.__str__

src/configdrift/cli.py

@@ -70,8 +70,6 @@ def check(
         raise typer.Exit(code=1)
 
     env_configs: dict[str, dict[str, Any]] = {}
-    env_labels = []
-
     env_labels = [baseline, target] if len(files) == 2 else [f"file_{i + 1}" for i in range(len(files))]
 
     for label, filepath in zip(env_labels, files, strict=False):

tests/test_cli.py

@@ -66,6 +66,21 @@ def test_check_error_file_not_found(self):
         assert result.exit_code == 1
         assert "Error loading" in result.stdout
 
+    def test_check_three_files(self):
+        """Compare three config files with auto-labeled environments."""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            a = Path(tmpdir) / "a.yaml"
+            b = Path(tmpdir) / "b.yaml"
+            c = Path(tmpdir) / "c.yaml"
+            a.write_text(yaml.dump({"host": "localhost", "port": 8080}))
+            b.write_text(yaml.dump({"host": "staging.example.com", "port": 8080}))
+            c.write_text(yaml.dump({"host": "prod.example.com", "port": 443}))
+
+            result = runner.invoke(app, ["check", str(a), str(b), str(c)])
+            assert result.exit_code == 0
+            assert "file_1" in result.stdout or "Config Drift" in result.stdout
+            assert "prod.example.com" in result.stdout
+
     def test_check_less_than_two_files(self):
         """Only one file should error."""
         with tempfile.TemporaryDirectory() as tmpdir:

tests/test_diff.py

@@ -10,6 +10,33 @@
 )
 
 
+class TestChangeStr:
+    def test_str_added(self):
+        """Change.__str__ for added key."""
+        c = Change(key="port", change_type=ChangeType.ADDED, new_value=8080, env="prod")
+        s = str(c)
+        assert "[+]" in s
+        assert "port" in s
+        assert "8080" in s
+        assert "prod" in s
+
+    def test_str_removed(self):
+        """Change.__str__ for removed key."""
+        c = Change(key="debug", change_type=ChangeType.REMOVED, old_value=True, env="dev")
+        s = str(c)
+        assert "[-]" in s
+        assert "debug" in s
+        assert "True" in s or "true" in s
+
+    def test_str_changed(self):
+        """Change.__str__ for changed key."""
+        c = Change(key="host", change_type=ChangeType.CHANGED, old_value="localhost", new_value="prod.example.com", env="prod")
+        s = str(c)
+        assert "[~]" in s
+        assert "localhost" in s
+        assert "prod.example.com" in s
+
+
 class TestDiffConfigs:
     def test_no_changes(self):
         base = {"host": "localhost", "port": 8080}