public void ThrowIfFallbackTenantIdentifierIsNull()
    {
        var services = new ServiceCollection();
        var builder  = new FinbuckleMultiTenantBuilder(services);

        Assert.Throws <ArgumentNullException>(() => builder.WithFallbackStrategy(null));
    }
    public void AddFallbackTenantIdentifier()
    {
        var services = new ServiceCollection();
        var builder  = new FinbuckleMultiTenantBuilder(services);

        builder.WithFallbackStrategy("test");
        var sp = services.BuildServiceProvider();

        var strategy = sp.GetRequiredService <FallbackStrategy>();

        Assert.Equal("test", strategy.identifier);
    }