rules.cs

        static bool ShouldAcceptConnectionRequest(bool firstUserHasConnections, bool secondUserHasConnections)
        {
            return !firstUserHasConnections && !secondUserHasConnections;
        }

test.cs

        public void AcceptingConnectionRequestFromUnconnectedUserShouldSucceed()
        {
            ShouldAcceptConnectionRequest(firstUserHasConnections: false, secondUserHasConnections: false)
                .Should().BeTrue();
        }