public void ShoulGetTraderStatusBlack() {// Arrange TraderService traderService = new TraderService( this.provider, this.traderRep, this.logger); var trader = new Trader() { Id = 0, name = "Evgeniy", surname = "Nikulin", phone = "+7()", money = -100, }; traderRep.GetTrader(0).Returns(trader); // Act var result = traderService.GetTraderStatus(0); // Assert Assert.AreEqual("Black status", result); }