public void ConstructorSetsInstanceeAndOptionType()
        {
            // Arrange
            var viewEngine = new TestModelBinder();

            // Act
            var descriptor = new ModelBinderDescriptor(viewEngine);

            // Assert
            Assert.Same(viewEngine, descriptor.Instance);
            Assert.Equal(viewEngine.GetType(), descriptor.OptionType);
        }
        public void ConstructorSetsOptionType()
        {
            // Arrange
            var type = typeof(TestModelBinder);

            // Act
            var descriptor = new ModelBinderDescriptor(type);

            // Assert
            Assert.Equal(type, descriptor.OptionType);
            Assert.Null(descriptor.Instance);
        }