public void TestTokenize()
        {
            // Arrange
            CommandEnvironment ci = new CommandEnvironment();
            string             s1 = "command";
            string             s2 = "command arg1";
            string             s3 = "command \"arg 1\" \"arg 2\"";

            // Act
            List <string> r1 = ci.tokenize(s1);
            List <string> r2 = ci.tokenize(s2);
            List <string> r3 = ci.tokenize(s3);

            // Assert
            Assert.AreEqual(1, r1.Count, "Single token - token count");
            Assert.AreEqual(2, r2.Count, "Two tokens - token count");
            Assert.AreEqual(3, r3.Count, "Three tokens with quotes - token count");
            Assert.AreEqual("command", r1[0], "Single token - value");
            Assert.AreEqual("command", r2[0], "Two tokens - value 1");
            Assert.AreEqual("arg1", r2[1], "Two tokens - value 1");
            Assert.AreEqual("command", r3[0], "Three tokens with quotes - value 1");
            Assert.AreEqual("arg 1", r3[1], "Three tokens with quotes - value 2");
            Assert.AreEqual("arg 2", r3[2], "Three tokens with quotes - value 3");
        }