这是我的nodejs打字稿类,并为isHealthy()公共方法编写了玩笑的单元测试。
测试覆盖率显示this.pingCheck()然后阻塞,捕获和最后一个return语句未被覆盖。请指教。
我们可以对pingCheck私有方法进行单元测试吗?
这是我的课程
import { HttpService, Injectable } from '@nestjs/common';
import { DependencyUtlilizationService } from '../dependency-utlilization/dependency-utlilization.service';
import { ComponentType } from '../enums/component-type.enum';
import { HealthStatus } from '../enums/health-status.enum';
import { ComponentHealthCheckResult } from '../interfaces/component-health-check-result.interface';
import { ApiHealthCheckOptions } from './interfaces/api-health-check-options.interface';
@Injectable()
export class ApiHealthIndicator {
private healthIndicatorResponse: {
[key: string]: ComponentHealthCheckResult;
};
constructor(
private readonly httpService: HttpService,
private readonly dependencyUtilizationService: DependencyUtlilizationService,
) {
this.healthIndicatorResponse = {};
}
private async pingCheck(api: ApiHealthCheckOptions): Promise<boolean> {
let result = this.dependencyUtilizationService.isRecentlyUsed(api.key);
if (result) {
await this.httpService.request({ url: api.url }).subscribe(() => {
return true;
});
}
return false;
}
async isHealthy(
listOfAPIs: ApiHealthCheckOptions[],
): Promise<{ [key: string]: ComponentHealthCheckResult }> {
for (const api of listOfAPIs) {
const apiHealthStatus = {
status: HealthStatus.fail,
type: ComponentType.url,
componentId: api.key,
description: `Health Status of ${api.url} is: fail`,
time: Date.now(),
output: '',
links: {},
};
await this.pingCheck(api)
.then(response => {
apiHealthStatus.status = HealthStatus.pass;
apiHealthStatus.description = `Health Status of ${api.url} is: pass`;
this.healthIndicatorResponse[api.key] = apiHealthStatus;
})
.catch(rejected => {
this.healthIndicatorResponse[api.key] = apiHealthStatus;
});
}
return this.healthIndicatorResponse;
}
}
这是我的单元测试代码。运行npm run test时出现以下错误]
((node:7876)UnhandledPromiseRejectionWarning:TypeError:无法读取未定义的属性'status'
((node:7876)UnhandledPromiseRejectionWarning:未处理的承诺拒绝。引发此错误的原因可能是抛出了一个没有catch块的异步函数,或者是拒绝了一个.catch()无法处理的承诺。 (拒绝ID:6)
import { HttpService } from '@nestjs/common';
import { Test, TestingModule } from '@nestjs/testing';
import { DependencyUtlilizationService } from '../dependency-utlilization/dependency-utlilization.service';
import { ApiHealthIndicator } from './api-health-indicator';
import { ApiHealthCheckOptions } from './interfaces/api-health-check-options.interface';
import { HealthStatus } from '../enums/health-status.enum';
describe('ApiHealthIndicator', () => {
let apiHealthIndicator: ApiHealthIndicator;
let httpService: HttpService;
let dependencyUtlilizationService: DependencyUtlilizationService;
let dnsList: [{ key: 'domain_api'; url: 'http://localhost:3001' }];
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
providers: [
ApiHealthIndicator,
{
provide: HttpService,
useValue: new HttpService(),
},
{
provide: DependencyUtlilizationService,
useValue: new DependencyUtlilizationService(),
},
],
}).compile();
apiHealthIndicator = module.get<ApiHealthIndicator>(ApiHealthIndicator);
httpService = module.get<HttpService>(HttpService);
dependencyUtlilizationService = module.get<DependencyUtlilizationService>(
DependencyUtlilizationService,
);
});
it('should be defined', () => {
expect(apiHealthIndicator).toBeDefined();
});
it('isHealthy should return status as true when pingCheck return true', () => {
jest
.spyOn(dependencyUtlilizationService, 'isRecentlyUsed')
.mockReturnValue(true);
const result = apiHealthIndicator.isHealthy(dnsList);
result.then(response =>
expect(response['domain_api'].status).toBe(HealthStatus.pass),
);
});
it('isHealthy should return status as false when pingCheck return false', () => {
jest
.spyOn(dependencyUtlilizationService, 'isRecentlyUsed')
.mockReturnValue(false);
jest.spyOn(httpService, 'request').mockImplementation(config => {
throw new Error('could not call api');
});
const result = apiHealthIndicator.isHealthy(dnsList);
result
.then(response => {
expect(response['domain_api'].status).toBe(HealthStatus.fail);
})
.catch(reject => {
expect(reject['domain_api'].status).toBe(HealthStatus.fail);
});
});
});
这是我的nodejs打字稿类,并为isHealthy()公共方法编写了玩笑的单元测试。测试覆盖率表明this.pingCheck()然后block,catch和last return语句未被覆盖。 ...
看起来您应该在初始化单元测试之前定义状态,尝试使用console.log
捕获更多日志,对于第二个测试,添加了catch块以确保您捕获了失败。