public void IsVMSS_RetrunsExpectedResult(string roleInstanceId, bool expected)
        {
            IEnvironment env = new TestEnvironment();

            if (roleInstanceId != null)
            {
                env.SetEnvironmentVariable(EnvironmentSettingNames.RoleInstanceId, roleInstanceId);
            }

            Assert.Equal(expected, EnvironmentExtensions.IsVMSS(env));
        }