public void LojalnyKontrahent_4DokumentyZOstatniegoPolrocza_False()
        {
            var result = KalkulatorRabatu.LojalnyKontrahent(() => new[]
            {
                Date.Today,
                Date.Today.AddMonths(-1),
                Date.Today.AddMonths(-3),
                Date.Today.AddMonths(-4)
            });

            Assert.IsFalse(result);
        }
        public void LojalnyKontrahent_5DokumentowZOstatniegoPolrocza_True()
        {
            var result = KalkulatorRabatu.LojalnyKontrahent(() => new[]
            {
                Date.Today,
                Date.Today.AddMonths(-1),
                Date.Today.AddMonths(-2),
                Date.Today.AddMonths(-3),
                Date.Today.AddMonths(-4),
            });

            Assert.IsTrue(result);
        }
        public void LojalnyKontrahent_Powyzej4DokumentowAleTylkoTrzyZOstatniegoPolrocza_False()
        {
            var result = KalkulatorRabatu.LojalnyKontrahent(() => new[]
            {
                Date.Today,
                Date.Today.AddMonths(-4),
                Date.Today.AddMonths(-5),
                Date.Today.AddMonths(-6),
                Date.Today.AddMonths(-7),
                Date.Today.AddMonths(-8),
                Date.Today.AddMonths(-9),
            });

            Assert.IsFalse(result);
        }