Testing Angular Components with Jasmine and Karma: When handling the 'onChange' event, the changeEvent parameter of type MatRadioChange should not be void and must be assigned to a parameter of type

Hey there, I was working on a test for a call where I am using to emit the event:

onChange(eventName: MatRadioChange): void {
    this.eventName.emit(eventName.value);
  }

Here is the test I have written for it:

describe('onChange', (eventName: MatRadioChange) => {
    it('should emit true to open calendar modal for mobile view', () => {
      spyOn(component.eventName, 'emit');
      component.onChange(eventName.value);
      expect(component.eventName.emit).toHaveBeenCalled();
    });
  });

But I keep encountering this error:

Argument of type '(changeEvent: MatRadioChange) => void' is not assignable to parameter of type '() => void'.

describe('onChange', (changeEvent: MatRadioChange) => {

Any assistance with this issue would be highly appreciated!

Answer №1

This particular problem is related to TypeScript. The error can be found on the following line:

component.onChange(eventName.value);

It seems that eventName.value is expected to be a string, not a MatRadioChange.

To resolve this issue, you can try the following workaround:

component.onChange({ value: 'xyz' } as any);

By using as any, you are essentially converting the object to type any, which should satisfy the MatRadioChange requirement.

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