TypeError：无法读取单元测试中未定义的属性“ alertType”

Question

我已经初始化reviewSummaryContent=<any>{}

 this.reviewSummaryContent = this.service.wizardData;  
  If(this.reviewSummaryContent.value.alertType==='Threshold'){
      //Code block
     }

将WizardData设置为

this.service.wizardData = {formObject: addNewAlertForm, value: addNewAlertForm.value};

但是运行测试时出现错误 TypeError：无法读取未定义的属性“ alertType”。