public void GivenAttributeInDictionary_ThenContainsAttributeIsTrue()
        {
            var target = new HtmlAttributeDictionary {
                "example"
            };

            target.ContainsAttribute("example").ShouldBeTrue();
        }
        public void WhenAttributeNameIsEmpty_ThenContainsAttributesThrowsException()
        {
            var target = new HtmlAttributeDictionary();

            Assert.Throws <ArgumentException>(
                () => target.ContainsAttribute("")
                );
        }
        public void GivenEmptyDictionary_ThenContainsAttributeIsFalse()
        {
            var target = new HtmlAttributeDictionary();

            target.ContainsAttribute("example").ShouldBeFalse();
        }