伙计们!我是测试人员的新手,并且一直坚持这个问题。我正在尝试为我的服务编写单元测试,该测试从服务器获取数据。经典案例:
public static String returnEmployeeName(String ID) throws ClassNotFoundException, SQLException {
HashMap<String, String> infoHR = connectionInfoHR();
String query = "SELECT first_name FROM employees WHERE employee_id = '" + ID + "'";
Class.forName("com.mysql.cj.jdbc.Driver");
Statement st;
ResultSet rs;
Connection con;
try (con = DriverManager.getConnection(infoHR.get("url"), infoHR.get("uname"), infoHR.get("pass"))) {
//Error on line above relating to not initialising the object within the statement
st = con.createStatement();
rs = st.executeQuery(query);
rs.next();
return rs.getString("first_name");
} finally {
st.close();
con.close();
}
}
我在服务文件中的方法如下:
import {TestBed} from '@angular/core/testing';
import {ShiftsService} from "./shifts.service";
import {Shift} from "../shift/shift";
describe('ShiftService - testing HTTP request method getShifts()', () => {
let httpTestingController: HttpTestingController;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [ShiftsService]
});
});
it('can test HttpClient.get', () => {
let shifts = new Array<Shift>();
let shiftsService;
let calendarMonth = new Date().getMonth()+2;
let calendarYear = new Date().getFullYear();
shiftsService = TestBed.inject(ShiftsService);
httpTestingController = TestBed.inject(HttpTestingController);
shiftsService.getShifts(calendarYear, calendarMonth).subscribe(response => {expect(response).toBe(response.length);
console.log(response);
});
let apiRequest:string = '/api/shifts?year='.concat(calendarYear.toString()).concat('&month=').concat(calendarMonth.toString());
const req = httpTestingController.expectOne(apiRequest);
console.log(apiRequest);
expect(req.request.method).toBe('GET');
req.flush(shifts);
});
afterEach(() => httpTestingController.verify());
});
我得到了错误:错误:预期[]为0。当我打印出 response 变量时,我发现它是空的!但我敢肯定,这种方法可以正常工作!在我的应用程序中效果很好!您能帮我解决这个问题吗?如何更正我的测试方法以测试服务?
答案 0 :(得分:1)
最后,您正在做req.flush(shifts)
和shifts = new Array<Shift>();
,本质上是[]
。刷新是您希望HTTP get请求响应的内容,在这种情况下,它是一个空数组。
在订阅中,您声明response
([]
)等于response.length
,即0
。
尝试一下:
it('can test HttpClient.get', (done) => { // add done callback to be able to call it in the subscribe
let shifts = new Array<Shift>();
let shiftsService;
let calendarMonth = new Date().getMonth()+2;
let calendarYear = new Date().getFullYear();
shiftsService = TestBed.inject(ShiftsService);
httpTestingController = TestBed.inject(HttpTestingController);
shiftsService.getShifts(calendarYear, calendarMonth).subscribe(response => {
// we have to use toEqual because toBe does a deep assertion
// but the array to compare to is in a different location in memory so
// toBe would fail
expect(response).toEqual([]);
console.log(response);
// call done to tell the unit test you are done with this test
done();
});
let apiRequest:string = '/api/shifts?year='.concat(calendarYear.toString()).concat('&month=').concat(calendarMonth.toString());
const req = httpTestingController.expectOne(apiRequest);
console.log(apiRequest);
expect(req.request.method).toBe('GET');
shifts.push(/* push a shift here */) // change the shifts array to what you want the server to respond with
req.flush(shifts);
});