How to test angular material dialog?

Question

I have a custom dialog component class which I am trying to test. Specifically my close function which is this

  close(): void {
    this.dialogRef.close();
  }

dialogRef is injected in that classes constructor as shown below

 constructor(public dialogRef: MatDialogRef<CustomDialogComponent>,
              @Inject(MAT_DIALOG_DATA) public data: any) {
  }

So my question would be, how could I mock dialogRef in my spec test file and test its close function?

My project is using angular 5, and angular material 5.

Answer 1

You shouldn't need to test this because the library you are using should already test its own component (which is not always the case).

But if you need a specific test which uses the close dialog reference, have a look at their test on this component which should help you write yours :

https://github.com/angular/components/blob/master/src/material/dialog/dialog.spec.ts#L186