public void FailInvalidImageFileExtension(string extension, SkinValidator skinValidator, string image)
        {
            var valid = skinValidator.ValidImageExtension(image + extension);

            Assert.False(valid);
        }
        public void AllowValidImageFileExtensions(string extension, SkinValidator skinValidator, string image)
        {
            var valid = skinValidator.ValidImageExtension(image + extension);

            Assert.True(valid);
        }