theme: added tests for UnifiedThemeProvider

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/theme/package.json

@@ -45,6 +45,9 @@
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",
+    "@mui/styles": "^5.14.18",
+    "@testing-library/jest-dom": "^6.0.0",
+    "@testing-library/react": "^14.0.0",
     "@types/react": "^16.13.1 || ^17.0.0"
   },
   "files": [

packages/theme/src/setupTests.ts

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2020 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 '@testing-library/jest-dom';

packages/theme/src/unified/UnifiedThemeProvider.test.tsx

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2022 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 {
+  useTheme as useV4Theme,
+  makeStyles as makeV4Styles,
+} from '@material-ui/core/styles';
+import { useTheme as useV5Theme } from '@mui/material/styles';
+import { makeStyles as makeV5Styles } from '@mui/styles';
+import { render, screen } from '@testing-library/react';
+import React from 'react';
+import './MuiClassNameSetup';
+import { UnifiedThemeProvider } from './UnifiedThemeProvider';
+import { themes } from './themes';
+
+describe('UnifiedThemeProvider', () => {
+  it('provides a themes for v4 and v5 directly', () => {
+    function MyV4Component() {
+      const theme = useV4Theme();
+      return <span>v4-grey: {theme.palette.grey[500]}</span>;
+    }
+    function MyV5Component() {
+      const theme = useV5Theme();
+      return <span>v5-grey: {theme.palette.grey[500]}</span>;
+    }
+
+    render(
+      <UnifiedThemeProvider theme={themes.light}>
+        <MyV4Component />
+        <MyV5Component />
+      </UnifiedThemeProvider>,
+    );
+
+    expect(screen.getByText('v4-grey: #9e9e9e')).toBeInTheDocument();
+    expect(screen.getByText('v5-grey: #9e9e9e')).toBeInTheDocument();
+  });
+
+  it('provides a themes for v4 and v5 through makeStyles', () => {
+    const useV4Styles = makeV4Styles(theme => ({
+      root: {
+        color: theme.palette.grey[500],
+      },
+    }));
+    const useV5Styles = makeV5Styles(theme => ({
+      root: {
+        color: theme.palette.grey[500],
+      },
+    }));
+
+    function MyV4Component() {
+      const classes = useV4Styles();
+      return <span className={classes.root}>v4</span>;
+    }
+    function MyV5Component() {
+      const classes = useV5Styles();
+      return <span className={classes.root}>v5</span>;
+    }
+
+    render(
+      <UnifiedThemeProvider theme={themes.light}>
+        <MyV4Component />
+        <MyV5Component />
+      </UnifiedThemeProvider>,
+    );
+
+    expect(window.getComputedStyle(screen.getByText('v4')).color).toBe(
+      'rgb(158, 158, 158)',
+    );
+    expect(window.getComputedStyle(screen.getByText('v5')).color).toBe(
+      'rgb(158, 158, 158)',
+    );
+  });
+});