public void FromAppSettingsValue_should_fail(string value)
 {
     Assert.Throws <ArgumentException>(() => {
         var signingInstance = GoogleSigned.FromValueString(value);
         var actual          = signingInstance.GetSignedUri(BASE_URI);
     });
 }
        public void FromAppSettingsValue_pass(string value, string expected)
        {
            //arrange

            //act
            var signingInstance = GoogleSigned.FromValueString(value);
            var actual          = signingInstance.GetSignedUri(BASE_URI);

            //assert
            Assert.AreEqual(expected, actual);
        }