XCTestCase to check if a method is called within a Struct
Use a protocol. Make your class/struct and your test mock conform to the protocol. Inject the dependency and assert that the expected method gets called in your mock.
Edit: Example
protocol DataApiProtocol { func getApplicationData(block: [AnyObject] -> Void)}// Production codestruct DataApi: DataApiProtocol { func getApplicationData(block: [AnyObject] -> Void) { // do stuff } // more properties and methods}// Mock codestruct MockDataApi: DataApiProtocol { var getApplicationDataGotCalled = false func getApplicationData(block: [AnyObject] -> Void) { getApplicationDataGotCalled = true }}// Test codefunc testGetData_CallsGetApplicationData() { let sut = MyAwesomeClass() let mockDataApi = MockDataApi() sut.getData(mockDataApi) XCTAssertTrue(mockDataApi.getApplicationDataGotCalled)}I hope this helps.