public void IntervalArray_ClearTheArray_ShouldThrowNullReferenceException()
{
IntervalArray <int> array = new IntervalArray <int>(1, 5)
{
1, 2, 3, 4
};
array.Clear();
Exception ex = Assert.Throws <NullReferenceException>(() => array[array.FirstIndex]);
Assert.Equal("Object reference not set to an instance of an object.", ex.Message);
}
