public async Task Should_SignIn(string AEmailAddr, string APassword)
        {
            var(LSessionId, LIsSignedIn, _) = await FAccounts.SignIn(AEmailAddr, APassword);

            var LIsGuidEmpty = LSessionId == Guid.Empty;

            LIsGuidEmpty.Should().BeFalse();
            LIsSignedIn.Should().BeTrue();
        }