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Jestでテスト用の環境変数を設定する

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describe('もとの環境変数はprocess.env.EXAMPLE="origin"だが、テスト1のときだけ"hogehoge"としたい', () => {
  const OLD_ENV = process.env;

  beforeEach(() => {
    process.env = { ...OLD_ENV };
  });

  afterEach(() => {
    jest.clearAllMocks();
  });

  it('テスト1', () => {
    process.env.EXAMPLE = "hogehoge"
    // この中ではprocess.env.EXAMPLE = "hogehoge"
  });

  
  it('テスト2', () => {
    // この中ではprocess.env.EXAMPLE = "origin"
  });
});
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