public void ConvertToString()
        {
            string[] s_array = { "Eric", "Clapton", null, "The", "World" };
            int[]    i_array = { 1, 5, 6, 5, 19 };
            string   s;

            var dict1 = new ReadWriteTestDictionary <string, int>(s_array, i_array);

            s = dict1.ToString();
            Assert.AreEqual("{Eric->1, Clapton->5, null->6, The->5, World->19}", s);

            var dict2 = new ReadOnlyTestDictionary <int, string>(i_array, s_array);

            s = dict2.ToString();
            Assert.AreEqual("{1->Eric, 5->Clapton, 6->null, 5->The, 19->World}", s);
        }
        public void DebuggerDisplayString()
        {
            string[] s_array = { "Eric", "Clapton", null, "The", "World" };
            int[]    i_array = { 1, 5, 6, 5, 19 };
            string   s;

            var dict1 = new ReadWriteTestDictionary <string, int>(s_array, i_array);

            s = dict1.ToString();
            Assert.AreEqual("{Eric->1, Clapton->5, null->6, The->5, World->19}", s);

            var dict2 = new ReadOnlyTestDictionary <int, string>(i_array, s_array);

            s = dict2.ToString();
            Assert.AreEqual("{1->Eric, 5->Clapton, 6->null, 5->The, 19->World}", s);

            var s_big = new string[1000];
            var i_big = new int[1000];

            for (var i = 0; i < i_big.Length; ++i)
            {
                i_big[i] = i * 2 + 1;
                s_big[i] = "foo" + i + "bar";
            }

            const string expected =
                "{1->foo0bar, 3->foo1bar, 5->foo2bar, 7->foo3bar, 9->foo4bar, 11->foo5bar, 13->foo6bar, 15->foo7bar, 17->foo8bar, 19->foo9bar, 21->foo10bar, 23->foo11bar, 25->foo12bar, 27->foo13bar, 29->foo14bar, 31->foo15bar, 33->foo16bar, 35->foo17bar, 37->foo18bar, ...}";

            var dict3 = new ReadWriteTestDictionary <int, string>(i_big, s_big);

            s = dict3.DebuggerDisplayString();
            Assert.AreEqual(expected, s);

            var dict4 = new ReadOnlyTestDictionary <int, string>(i_big, s_big);

            s = dict4.DebuggerDisplayString();
            Assert.AreEqual(expected, s);
        }