my test keeps crashing, it’s an assertionFailure in onChange. But that’s expected. the onChange method should receive a snapshot which conforms to the protocol. Is there a way to keep this test while still keeping the assertionFailure in onChange, which triggers in a guard statement if the it doesnt conform to the protocol?

func testOnChangeWithInvalidValueShouldNotUpdateSnapshot() {
    let listener = SomeListenerFake()
    let expectation = XCTestExpectation(description: "Snapshot updated and listener notified")
    expectation.isInverted = true
    fakeListener.onUpdatedModelList = {
      expectation.fulfill()
    }
    guard let delegate = someObject as? SomeDelegate else {
      XCTFail("someObject is not a SomeDelegate")
      return
    }
    someObject?.set(listener: listener)
    delegate.onChange(withId: "invalid value")
    wait(for: [expectation], timeout: 1.0)
    XCTAssertNil(listener.capturedValue)
    XCTAssertFalse(listener.methodCalled)
  }