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错误消息：

‘expect’ was used when there was no current spec, this could be because an asynchronous test timed out

原始的单元测试代码：

describe('Jerry for Spartacus unit test', () => {
     const valueService = new ValueService();  expect(valueService.getValue()).toEqual('Jerry');} );

解决方法

describe('Jerry for Spartacus unit test', () => {
     it('#getValue unit test here!', () => {
       const valueService = new ValueService();    expect(valueService.getValue()).toEqual('Jerry');  });});

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