public void Solve_CalledWithFewerOrMoreThanSixNumbers_Returns400(int target, int[] numbers) { // ACT var result = numbersController.Solve(target, numbers); // ASSERT Assert.IsType(typeof(BadRequestObjectResult), result); Assert.Equal(400, ((BadRequestObjectResult)result).StatusCode); Assert.Contains("Request must provide 6 numbers", (string)((BadRequestObjectResult)result).Value); }