我需要使用Apollo Client在React组件之外的辅助函数中执行graphql查询,经过一番尝试和错误后,我采用了这种方法,该方法应该可以正常工作:
setup.ts
export const setupApi = (): ApolloClient<any> => {
setupServiceApi(API_CONFIG)
return createServiceApolloClient({ uri: `${API_HOST}${API_PATH}` })
}
getAssetIdFromService.ts
import { setupApi } from '../api/setup'
const client = setupApi()
export const GET_ASSET_ID = gql`
query getAssetByExternalId($externalId: String!) {
assetId: getAssetId(externalId: $externalId) {
id
}
}
`
export const getAssetIdFromService = async (externalId: string) => {
return await client.query({
query: GET_ASSET_ID,
variables: { externalId },
})
return { data, errors, loading }
}
现在,我正在尝试为getAssetIdFromService
函数编写测试测试,但是在弄清楚如何使client.query
方法在测试中工作时遇到了麻烦。
我尝试了以下方法,包括许多其他无效的方法。对于此特定设置,开玩笑会抛出
TypeError:client.query不是函数
import { setupApi } from '../../api/setup'
import { getAssetIdFromService } from '../getAssetIdFromService'
jest.mock('../../api/setup', () => ({
setupApi: () => jest.fn(),
}))
describe('getAssetIdFromService', () => {
it('returns an assetId when passed an externalId and the asset exists in the service', async () => {
const { data, errors, loading } = await getAssetIdFromService('e1')
// Do assertions
})
}
我想我在这方面缺少一些东西:
jest.mock('../../api/setup', () => ({
setupApi: () => jest.fn(),
}))
...但是我看不到。
您没有正确嘲笑。这是正确的方法:
getAssetIdFromService.ts
:
import { setupApi } from './setup';
import { gql } from 'apollo-server';
const client = setupApi();
export const GET_ASSET_ID = gql`
query getAssetByExternalId($externalId: String!) {
assetId: getAssetId(externalId: $externalId) {
id
}
}
`;
export const getAssetIdFromService = async (externalId: string) => {
return await client.query({
query: GET_ASSET_ID,
variables: { externalId },
});
};
setup.ts
:
export const setupApi = (): any => {};
getAssetIdFromService.test.ts
:
import { getAssetIdFromService, GET_ASSET_ID } from './getAssetIdFromService';
import { setupApi } from './setup';
jest.mock('./setup.ts', () => {
const mApolloClient = { query: jest.fn() };
return { setupApi: jest.fn(() => mApolloClient) };
});
describe('59829676', () => {
it('should query and return data', async () => {
const client = setupApi();
const mGraphQLResponse = { data: {}, loading: false, errors: [] };
client.query.mockResolvedValueOnce(mGraphQLResponse);
const { data, loading, errors } = await getAssetIdFromService('e1');
expect(client.query).toBeCalledWith({ query: GET_ASSET_ID, variables: { externalId: 'e1' } });
expect(data).toEqual({});
expect(loading).toBeFalsy();
expect(errors).toEqual([]);
});
});
单元测试结果覆盖率100%:
PASS apollo-graphql-tutorial src/stackoverflow/59829676/getAssetIdFromService.test.ts (8.161s)
59829676
✓ should query and return data (7ms)
--------------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
--------------------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
getAssetIdFromService.ts | 100 | 100 | 100 | 100 | |
--------------------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 8.479s
源代码:https://github.com/mrdulin/apollo-graphql-tutorial/tree/master/src/stackoverflow/59829676