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Testing LinkButton Component Rendering in Apache Airflow

This test suite validates the LinkButton component in Apache Airflow’s web interface, ensuring proper rendering and behavior of link-styled buttons. The tests verify the component’s core functionality of transforming child content into clickable link elements while maintaining styling consistency.

Test Coverage Overview

The test coverage focuses on the fundamental rendering capabilities of the LinkButton component.

Verifies proper rendering of child content within link elements
Ensures link tag (a) is correctly generated
Tests DOM structure and element presence

Implementation Analysis

The testing approach utilizes React Testing Library’s render method to evaluate component output.

The implementation employs Jest’s expect assertions combined with Testing Library’s getByText query, demonstrating modern React component testing patterns. The tests validate both content rendering and DOM structure verification.

Technical Details

Testing Stack:

Jest as the test runner and assertion library
React Testing Library for component rendering and DOM queries
TypeScript for type-safe testing
Custom LinkButton component implementation

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

User-centric testing approach using Testing Library’s recommended patterns
Clear test descriptions and expectations
Isolation of component rendering logic
Verification of both content and structure

apache/airflow

airflow/www/static/js/components/LinkButton.test.tsx

            
/*!
 * 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,
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 * "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.
 */

/* global describe, test, expect */

import React from "react";
import { render } from "@testing-library/react";

import LinkButton from "./LinkButton";

describe("Test LinkButton Component.", () => {
  test("LinkButton should be rendered as a link.", () => {
    const { getByText, container } = render(
      <LinkButton>
        <div>The link</div>
      </LinkButton>
    );

    expect(getByText("The link")).toBeDefined();
    expect(container.querySelector("a")).not.toBeNull();
  });
});