Question

我正在尝试对名为search的方法进行单元测试，该方法具有三种方法，例如buildSearchParameter，isUnknownFields，readAll。我需要嘲笑他们，但我不知道该怎么做。有人可以帮我吗？

    search = async (=> {
        const searchParam = buildSearchParameter();
        // check for unknown fields
        const isUnknownFields = isUnknownFields();
        readAll()
})

Answer 1

为简化问题，我删除了它的静态类型。您可以使用Expanded(child: Column( children: <Widget>[ Container( height: 50, width: MediaQuery.of(context).size.width * 0.8, child: Text(snapshot.data.documents[index]['title']), ), Container( height: 50, width: MediaQuery.of(context).size.width * 0.8, child: Text(snapshot.data.documents[index]['body']), ), ], ), ),为这三种方法创建存根。这是单元测试解决方案：

jest.spyOn：

index.ts

import ModelUtility from './ModelUtility'; enum EndpointType { SEARCH = 'SEARCH', } export class SomeClass { schemaConstants; errorConstants = { invalidQueryParameters: 'invalid', }; search = async (query, endpointConstants) => { const searchParam = ModelUtility.buildSearchParameter(query, endpointConstants, this.schemaConstants); // check for unknown fields const isUnknownFields = ModelUtility.isUnknownFields(EndpointType.SEARCH, searchParam, this.schemaConstants); if (isUnknownFields) { return this.errorConstants.invalidQueryParameters; } return this.readAll(query, searchParam, endpointConstants); }; readAll(...args) { return 'real data'; } }：

ModelUtility.ts

export default { buildSearchParameter(...args) { return 'real search parameter'; }, isUnknownFields(...args) { return true; }, };：

index.spec.ts

带有覆盖率报告的单元测试结果：

import { SomeClass } from './';
import ModelUtility from './ModelUtility';

describe('SomeClass', () => {
  afterEach(() => {
    jest.restoreAllMocks();
  });
  it('should return invalid query parameters', async () => {
    const buildSearchParameterSpy = jest
      .spyOn(ModelUtility, 'buildSearchParameter')
      .mockReturnValueOnce('mocked search parameter');
    const isUnknownFieldsSpy = jest.spyOn(ModelUtility, 'isUnknownFields').mockReturnValueOnce(true);

    const instance = new SomeClass();
    const actual = await instance.search('mocked query', 'endpointConstants');
    expect(actual).toBe('invalid');
    expect(buildSearchParameterSpy).toBeCalledWith('mocked query', 'endpointConstants', undefined);
    expect(isUnknownFieldsSpy).toBeCalledWith('SEARCH', 'mocked search parameter', undefined);
  });

  it('should return correctly', async () => {
    const buildSearchParameterSpy = jest
      .spyOn(ModelUtility, 'buildSearchParameter')
      .mockReturnValueOnce('mocked search parameter');
    const isUnknownFieldsSpy = jest.spyOn(ModelUtility, 'isUnknownFields').mockReturnValueOnce(false);

    const instance = new SomeClass();
    jest.spyOn(instance, 'readAll').mockReturnValueOnce('mocked data');
    const actual = await instance.search('mocked query', 'endpointConstants');
    expect(actual).toBe('mocked data');
    expect(buildSearchParameterSpy).toBeCalledWith('mocked query', 'endpointConstants', undefined);
    expect(isUnknownFieldsSpy).toBeCalledWith('SEARCH', 'mocked search parameter', undefined);
  });
});

如何使用JEST在方法内部模拟方法？

1 个答案: