Node.js单元测试的Istanbul代码覆盖率：如何编写单元测试用例以覆盖条件

Question

我有一个调用API调用的函数，我可以将API调用存根，但是当我  编写单元测试用例并运行伊斯坦布尔报告我看不到测试范围  对于是否满足条件

 class EmpController {
        getEmployee() {
            const options = paylod();
            let emp = new Promise((resolve, reject) => {


        Service.myAPI(options, (response) => {
                if (response.error) {
                    reject(response.error);

                } else {

                    resolve(response.body);
                }
            })
        });

        return emp;
    }
}

it('Emp test', (done) => {
    // Mock the request response
    nock('http://domain')
        .post('api/abc')
        .reply(201, response);
    sinon.stub(outhController, 'getEmployee').returns(Promise.resolve(response));
    EmpController.getEmployee(payload)
        .then(response => {
            //expect an object back
            expect(typeof response).to.equal('object');
            done();
        });
});