test: add React Testing Library (#11771)

superset-frontend/spec/javascripts/components/Timer_spec.tsx

@@ -0,0 +1,85 @@
+/**
+ * @jest-environment jsdom
+ */
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 React from 'react';
+import { render, sleep, waitFor } from 'spec/helpers/testing-library';
+import Timer from 'src/components/Timer';
+import { now } from 'src/modules/dates';
+
+function parseTime(text?: string | null) {
+  return !!text && Number(text.replace(/:/g, ''));
+}
+
+describe('Timer', () => {
+  const mockProps = {
+    startTime: now(),
+    endTime: undefined,
+    isRunning: true,
+    status: 'warning',
+  };
+
+  it('should render correctly', async () => {
+    const screen = render(<Timer {...mockProps} />);
+    const node = screen.getByRole('timer');
+    let text = node.textContent || '';
+    expect(node).toBeInTheDocument();
+    expect(node).toHaveClass('label-warning');
+    expect(node).toHaveTextContent('00:00:00.00');
+    // should start running
+    await waitFor(() => {
+      expect(parseTime(screen.getByRole('timer')?.textContent)).toBeGreaterThan(
+        0.2,
+      );
+    });
+    text = node.textContent || '';
+
+    // should stop
+    screen.rerender(<Timer {...mockProps} isRunning={false} />);
+    // the same node should still be in DOM and the content should not change
+    expect(screen.getByRole('timer')).toBe(node);
+    expect(node).toHaveTextContent(text);
+
+    // the timestamp should not change even after while
+    await sleep(100);
+    expect(screen.getByRole('timer')).toBe(node);
+    expect(node).toHaveTextContent(text);
+
+    // should continue and start from stopped time
+    screen.rerender(<Timer {...mockProps} isRunning />);
+    expect(screen.getByRole('timer')).toBe(node);
+    expect(node).toHaveTextContent(text);
+
+    await waitFor(() => {
+      expect(screen.getByRole('timer')).toBe(node);
+      expect(parseTime(node.textContent)).toBeGreaterThan(0.3);
+    });
+
+    // should restart from start
+    screen.rerender(<Timer {...mockProps} startTime={now()} />);
+    await waitFor(() => {
+      expect(parseTime(node.textContent)).toBeLessThan(0.1);
+    });
+    // should continue to run
+    await waitFor(() => {
+      expect(parseTime(node.textContent)).toBeGreaterThan(0.3);
+    });
+  });
+});