如何解决获取调用间谍的参数
我正在监视 emit
中 EventEmitter
的 Angular
方法
spyOn(answerComponent.answerEmitter,'emit');
我想检查是否使用参数 emit
调用了 A
,但我不想检查与 A
的完全匹配。我想检查 emit
是否使用值 A.a,A.b
调用并忽略 A.c
的值。
可以吗?
解决方法
我想到了两种方法:
使用原生 toHaveBeenCalledWith
expect(answerComponent.answerEmitter,'emit').toHaveBeenCalledWith(A.a);
expect(answerComponent.answerEmitter,'emit').toHaveBeenCalledWith(A.b);
// you can think of all the callers being tracked as an array and you can assert with
// toHaveBeenCalledWith to check the array of all of the calls and see the arguments
expect(anserComponent.anserEmitter,'emit').not.toHaveBeenCalledWith(A.c); // maybe you're looking for this as well
您还可以监视发射并调用假函数:
spyOn(answerComponent.answerEmitter,'emit').and.callFake((arg: any) => {
// every time emit is called,this fake function is called
if (arg !== A.a || arg !== A.b) {
throw 'Wrong argument passed!!'; // you can refine this call fake
} // but the point is that you can have a handle on the argument passed and assert it
});
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