From fb39c1615605b16846e90da14bdc89155fde8c8a Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Thu, 16 Nov 2023 15:28:37 +0100
Subject: [PATCH] theme: added test for component overrides

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 packages/theme/src/v5/types.test.ts | 47 +++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 packages/theme/src/v5/types.test.ts

diff --git a/packages/theme/src/v5/types.test.ts b/packages/theme/src/v5/types.test.ts
new file mode 100644
index 0000000000..12bd0ff2b8
--- /dev/null
+++ b/packages/theme/src/v5/types.test.ts
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { palettes } from '../base';
+import { createUnifiedTheme } from '../unified';
+
+declare module '@backstage/theme' {
+  interface OverrideComponentNameToClassKeys {
+    MyTestComponent: 'root' | 'header';
+  }
+}
+
+describe('OverrideComponentNameToClassKeys', () => {
+  it('should provide type safe component style overrides', () => {
+    const theme = createUnifiedTheme({
+      palette: palettes.light,
+      components: {
+        MyTestComponent: {
+          styleOverrides: {
+            root: {
+              color: '#f00',
+            },
+            // @ts-expect-error
+            invalid: {
+              color: '#b45',
+            },
+          },
+        },
+      },
+    });
+
+    expect(theme).toBeDefined();
+  });
+});