[Jest] Write data driven tests in Jest with test.each

最新推荐文章于 2024-09-14 08:10:02 发布

转载最新推荐文章于 2024-09-14 08:10:02 发布 · 58 阅读

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原文链接：http://www.cnblogs.com/Answer1215/p/9291049.html

通过JUnit 23版本新增的test.each方法，可以将多个单元测试案例整合为单一的数据驱动测试，简化测试代码并提高维护效率。

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Often, we end up creating multiple unit tests for the same unit of code to make sure it behaves as expected with varied input. This is a good practice, but it can be a little tedious to create what is essentially the same test multiple times. We copy a test, paste it and update the variables that matter. Maybe we do that several times. Then, if we need to update our tests, we update each copy of the test. The good news is, starting with version 23 of Jest, there is built-in support for creating data-driven tests. In this lesson we'll take a handful of unit tests and reduce them down to a single, data-driven test with the new test.each method in Jest. We'll also look at the alternate version of test.each that lets us use a tagged template literal to describe the data for our test.

Additional info:

In the Jest docs: https://facebook.github.io/jest/docs/en/api.html#testeachtable-name-fn

Jest cheatsheet: https://github.com/sapegin/jest-cheat-sheet#data-driven-tests-jest-23

describe('isPalindrome - each', () => {
  const data = [
    ['Racecar', true],
    ['Typewriter', false],
    ['rotor', true],
    ['kayak', true],
    ['Step on no pets', true]
  ];
  test.each(data)('isPalindrome(%s) --- %s', (input, expected) => {

    const result = isPalindrome(input);
    expect(result).toBe(expected)
  })
})

describe('isPalindrome - each template literal', () => {
  test.each`
  input           | expected
  ${'Racecar'}    | ${true}
  ${'Typewriter'} | ${false}
  ${'rotor'}      | ${true}
  `('isPalindrome("$input") - $expected', ({ input, expected }) => {
    const result = isPalindrome(input)
    expect(result).toBe(expected)
  })
})

转载于:https://www.cnblogs.com/Answer1215/p/9291049.html