Angular2 测试用例显示 No provider for NgControl

Question

ng test 显示以下错误，但实际上可以正常工作。

Error: Template parse errors:
    No provider for NgControl ("
      <div class="form-group">
        <label class="control-label">Location</label>
        [ERROR ->]<select class="selectpicker" *ngIf="locations" data-style="btn btn-primary btn-round" title="Select A"): VehicleFormComponent@27:4
    No provider for NgControl ("  <div class="form-group label-floating">
        <label class="control-label">Is Available</label>
        [ERROR ->]<md-slide-toggle [(ngModel)]="isAvailable" color="primary" [ngModelOptions]="{standalone: true}">
       "): VehicleFormComponent@41:4 in src/test.ts (line 25739)
    Expected undefined to be truthy.

我认为这主要是因为在自定义标签中添加了[ngModelOptions]="{standalone: true}"。

Answer 1

您是否在 TestBed 模块中添加了对“FormsModule”的引用？

import { FormsModule } from '@angular/forms';

TestBed.configureTestingModule({
  imports: [ FormsModule ]
})
.compileComponents();

Answer 2

如果有其他人来这里，也许这会有所帮助。我在构造函数中缺少可选的装饰器：

  constructor(@Optional() @Self() public ngControl: NgControl) {}