public void GetTest_Exists_Pass()
        {
            var dict = new BiDictionaryOneToOne <int, int> {
                { 0, 815 },
            };

            Assert.Equal(815, dict.Get(0));
        }
        public void GetTest_Missing_Fail()
        {
            var dict = new BiDictionaryOneToOne <int, int> {
                { 0, 815 },
            };

            object Check() => dict.Get(42);

            Assert.Throws <ArgumentException>(Check);
        }