scaffolder: add test for TemplateEditorPage

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

plugins/scaffolder/src/components/TemplateEditorPage/DryRunResults/DryRunResultsView.test.tsx

@@ -31,19 +31,6 @@ jest.mock('react-virtualized-auto-sizer', () => ({
   }) => <>{props.children({ width: 400, height: 200 })}</>,
 }));
 
-// Patch jsdom to add feature used by CodeMirror
-document.createRange = () => {
-  const range = new Range();
-
-  range.getClientRects = () => ({
-    item: () => null,
-    length: 0,
-    [Symbol.iterator]: jest.fn(),
-  });
-
-  return range;
-};
-
 function DryRunRemote() {
   const dryRun = useDryRun();
 

plugins/scaffolder/src/components/TemplateEditorPage/TemplateEditorPage.test.tsx

@@ -0,0 +1,58 @@
+/*
+ * 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 { catalogApiRef } from '@backstage/plugin-catalog-react';
+import { renderInTestApp, TestApiProvider } from '@backstage/test-utils';
+import { screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import React from 'react';
+import { TemplateEditorPage } from './TemplateEditorPage';
+
+describe('TemplateEditorPage', () => {
+  it('renders without exploding', async () => {
+    await renderInTestApp(<TemplateEditorPage />);
+
+    expect(screen.getByText('Load Template Directory')).toBeInTheDocument();
+    expect(screen.getByText('Edit Template Form')).toBeInTheDocument();
+  });
+
+  it('template directory loading should not be supported in Jest', async () => {
+    await renderInTestApp(<TemplateEditorPage />);
+
+    expect(
+      screen.getByRole('button', { name: /Load Template Directory/ }),
+    ).toBeDisabled();
+  });
+
+  it('should be able to continue to form preview', async () => {
+    await renderInTestApp(
+      <TestApiProvider
+        apis={[
+          [
+            catalogApiRef,
+            { getEntities: jest.fn().mockResolvedValue({ items: [] }) },
+          ],
+        ]}
+      >
+        <TemplateEditorPage />
+      </TestApiProvider>,
+    );
+
+    await userEvent.click(screen.getByText('Edit Template Form'));
+
+    expect(screen.getByLabelText('Load Existing Template')).toBeInTheDocument();
+  });
+});

plugins/scaffolder/src/setupTests.ts

@@ -19,3 +19,16 @@ import 'cross-fetch/polyfill';
 
 const { EventSourcePolyfill } = jest.requireMock('event-source-polyfill');
 global.EventSource = EventSourcePolyfill;
+
+// Patch jsdom to add feature used by CodeMirror
+document.createRange = () => {
+  const range = new Range();
+
+  range.getClientRects = () => ({
+    item: () => null,
+    length: 0,
+    [Symbol.iterator]: jest.fn(),
+  });
+
+  return range;
+};