public void TestIfItSetsParentFieldOnCommandWhenItMatchesTheParentType()
        {
            // Arrange
              var parentMock = new Mock<Parent>();
              var target = new ItsAssertable<Parent, Child>(p => p.Child);

              // Act
              target.Command(parentMock.Object);

              // Assert
              Assert.AreEqual(parentMock.Object, target.GetFieldValue("mParent"));
        }
        public void TestIfIgnoresTheCommandWhenItDoesntMatchTheParentType()
        {
            // Arrange
              var wrongMock = new Mock<Child>();
              var target = new ItsAssertable<Parent, Child>(p => p.Child);

              // Act
              target.Command(wrongMock.Object);

              // Assert
              Assert.IsNull(target.GetFieldValue("mParent"));
        }