public void CheckValidQuotedString_ValidAndInvalidvalues_MatchExpectation()
        {
            // No exception expected for the following input.
            HeaderUtilities.CheckValidQuotedString("\"x\"", "param");
            HeaderUtilities.CheckValidQuotedString("\"x y\"", "param");

            Assert.Throws <ArgumentException>(() => { HeaderUtilities.CheckValidQuotedString(null, "param"); });
            Assert.Throws <ArgumentException>(() => { HeaderUtilities.CheckValidQuotedString("", "param"); });
            Assert.Throws <FormatException>(() => { HeaderUtilities.CheckValidQuotedString("\"x", "param"); });
            Assert.Throws <FormatException>(() => { HeaderUtilities.CheckValidQuotedString("\"x\"y", "param"); });
        }