运行 jest 时设置 env 变量

Question

我在我的上定义了这个变量main.ts

const mockMode = process.env.MOCK_MODE;

我只是创建一个测试并将此变量设置为 true，但在 main 上没有得到'true'，但是'false'

describe('onBook', () => {

    // Arrange
     const mockMode = "true";
     ...

Answer 1

process.env.MOCK_MODE您可以直接在单元测试用例中设置 的值，并在最后将其恢复为原始值。

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例如

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main.ts:

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export function main() {\n  const mockMode = process.env.MOCK_MODE;\n  return mockMode;\n}\n

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main.test.ts:

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import { main } from \'./main\';\n\ndescribe(\'main\', () => {\n  it(\'should pass\', () => {\n    const original = process.env.MOCK_MODE;\n    process.env.MOCK_MODE = \'true\';\n    const actual = main();\n    expect(actual).toBe(\'true\');\n    process.env.MOCK_MODE = original;\n  });\n  it(\'should restore MOCK_MODE\', () => {\n    expect(process.env.MOCK_MODE).toBe(\'undefined\');\n  });\n});\n

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单元测试结果：

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 PASS  src/stackoverflow/59319610/main.test.ts (14.207s)\n  main\n    \xe2\x9c\x93 should pass (7ms)\n    \xe2\x9c\x93 should restore MOCK_MODE (1ms)\n\nTest Suites: 1 passed, 1 total\nTests:       2 passed, 2 total\nSnapshots:   0 total\nTime:        16.293s\n

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