为什么分支覆盖是随机的？

Question

我有这 4 个单元测试。

const handleHttp = (method: 'POST' | 'GET' | 'PUT' | 'DELETE'): void => {
  const req = httpTestingController.expectOne(`${environment.apiUrl}test`);
  expect(req.request.method).toEqual(method);
  return req.flush({ fake: 1 });
};

it('should make a POST request', fakeAsync(() => {
  service.post('test', { fakeProp: 'fakeValue' }).then((res) => {
    expect(res).toEqual({ fake: 1 });
  });
  handleHttp('POST');
}));

it('should make a GET request', fakeAsync(() => {
  service.get('test').then((res) => {
    expect(res).toEqual({ fake: 1 });
  });
  handleHttp('GET');
}));

it('should make a PUT request', fakeAsync(() => {
  service.put('test', { fakeProp: 'fakeValue' }).then((res) => {
    expect(res).toEqual({ fake: 1 });
  });
  handleHttp('PUT');
}));

it('should make a DELETE request', fakeAsync(() => {
  service.delete('test', { fakeProp: 'fakeValue' }).then((res) => {
    expect(res).toEqual({ fake: 1 });
  });
  handleHttp('DELETE');
}));

方法选项参数都一样：

post<T>(url: string, body: object, options: object = this.httpOptions): Promise<T> {
get<T>(url: string, options: object = this.httpOptions): Promise<T> {
put<T>(url: string, body: object, options: object = this.httpOptions): Promise<T> {
delete<T>(url: string, options: object = this.httpOptions): Promise<T> {

结果：

75% 分支 3/4

截图：

只有最后一个参数 options 没有被覆盖，前 3 个被覆盖。

图书馆：

"jasmine-core": "~3.4.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~4.1.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.1",
"karma-jasmine": "~2.0.1",
"karma-jasmine-html-reporter": "^1.4.0",

所以问题是：为什么分支覆盖看起来是随机的或者我的代码中遗漏了一些东西？我应该运行测试还是不重要？

Answer 1

您唯一一次调用提供选项的方法是在调用 delete 时（我怀疑您实际上并不是故意的）。

为什么分支覆盖是随机的？

Why branches coverage is random?

angular

istanbul

karma-coverage

angular-unit-test

我有这 4 个单元测试。

方法选项参数都一样：

结果：

75% 分支 3/4

截图：