testComponent.vue

<script lang="ts">
import 'testMethod' from 'testService';
export default class testComponent extends Vue {
  mounted(){
    testMethod();
  }
}
</script>

testComponent.spec.vue

describe('test component',() => {
  it('should mount correctly',() => {
    const wrapper = shallowMount(testComponent);
  });
});

我要监视testMethod，因为它正在进行api调用。使用茉莉花进行测试时如何监视？