public void Should_throw_ArgumentNullException_when_policy_to_add_is_null()
        {
            // Arrange
            var policyAppender = new DefaultPolicyAppender();

            // Act & Assert
            Assert.Throws<ArgumentNullException>(() =>
                policyAppender.UpdatePolicies(null, new List<ISecurityPolicy>())
            );
        }
        public void Should_throw_ArgumentNullException_when_policies_is_null()
        {
            // Arrange
            var policyAppender = new DefaultPolicyAppender();

            // Act & Assert
            Assert.Throws <ArgumentNullException>(() =>
                                                  policyAppender.UpdatePolicies(new IgnorePolicy(), null)
                                                  );
        }
        public void Should_throw_ArgumentNullException_when_policies_is_null()
        {
            // Arrange
            var policyAppender = new DefaultPolicyAppender();

            // Act & Assert
            Assert.Throws<ArgumentNullException>(() =>
                policyAppender.UpdatePolicies(new IgnorePolicy(), null)
            );
        }
        public void Should_throw_ArgumentNullException_when_policy_to_add_is_null()
        {
            // Arrange
            var policyAppender = new DefaultPolicyAppender();

            // Act & Assert
            Assert.Throws <ArgumentNullException>(() =>
                                                  policyAppender.UpdatePolicies(null, new List <ISecurityPolicy>())
                                                  );
        }