public void SetIndexer_IDictionary(string input)
        {
            IDictionary <string, bool> dict = new KeyThrowingDictionary <string, bool>();

            dict[input] = default;
            Assert.True(dict.ContainsKey(input));
        }
        public void Contains_IDictionary(string input)
        {
            IDictionary <string, bool> dict = new KeyThrowingDictionary <string, bool>();

            dict.Add(input, true);
            Assert.True(dict.ContainsKey(input));
        }