public void RotateArray_Throw_Exception()
{
//arrange
var moqRotateArray = new RotateArray();
var expectedResult = new ArgumentNullException();
//act
var sut = Assert.Throws <ArgumentNullException>(
() => moqRotateArray.GetRotateArray(null, -1),
"should not be null parameters and number should be more than 0");
//act
Assert.AreEqual(sut.InnerException, expectedResult.InnerException);
}
