public void AddShopItemTest_input_productId_shopId_count_output_true() { // Arrange int productId = 1; int shopId = 2; int count = 5; var shopItems = new AddShopItem(); var repo = new Mock <ShopItemRepository>(); repo.Setup(arg => arg.Create(It.IsAny <ShopItem>())); repo.Setup(arg => arg.Save()); shopItems.db = repo.Object; // Act var result = shopItems.AddShpItem(productId, shopId, count); // Assert Assert.IsTrue(result); repo.Verify(arg => arg.Create(It.IsAny <ShopItem>()), Times.Once()); repo.Verify(arg => arg.Save(), Times.Once()); }