public void When_Two_Instances_Are_Equals_Then_They_Have_Same_Hash_Code()
{
// ARRANGE
var left = new NonEmptyString("foo");
var right = new NonEmptyString("foo");
// ACT
var result1 = left.GetHashCode();
var result2 = right.GetHashCode();
// ASSERT
Assert.AreEqual(result1, result2);
}