public void Sum_MockingReturnValue_ReturnsMockedValue()
 {
     LegacyStaticClass.SumDelegate = (a, b) => 6;
     LegacyStaticClass.Sum(5, 6).ShouldBe(6);
 }
 public void Sum_NoMocking_AddsValues()
 {
     LegacyStaticClass.Sum(5, 6).ShouldBe(11);
 }