C# 使用 Moq 从模拟存储库中删除项目

Question

我正在尝试使用 C# 中的 Moq 框架进行测试删除，我正在测试项目是否已删除。

在底部，如果我将 int count 设置为 events.Count，它 returns 3。太棒了！！但是，如果我将它设置为 EventsMockDatabase.Count()，它 returns 5 尽管模拟已设置为 return events.Count.

谁能帮我解释一下为什么？

    [Test]
    public void DeleteDuplicateEventDetailsFromRows()
    {
        var event1 = new EventLogObj() { RecordId = 1, TableKey = "PERSON_CODE=1", Status = "S" };
        var event2 = new EventLogObj() { RecordId = 2, TableKey = "PERSON_CODE=2", Status = "S" };
        var event3 = new EventLogObj() { RecordId = 3, TableKey = "PERSON_CODE=3", Status = "S" };
        var event4 = new EventLogObj() { RecordId = 4, TableKey = "PERSON_CODE=2", Status = "S" };
        var event5 = new EventLogObj() { RecordId = 5, TableKey = "PERSON_CODE=1", Status = "S" };

        var events = new List<EventLogObj>() { event1, event2, event3, event4, event5 };

        var mockEventsRepository = new Mock<IEventRepository>();

        mockEventsRepository.Setup(ev => ev.GetEvents())
            .Returns(events);

        mockEventsRepository.Setup(ev => ev.DeleteEvent(It.IsAny<decimal>()))
            .Callback((decimal RecID) =>
            {
                events.RemoveAll(e => e.RecordId == RecID);
            });

        mockEventsRepository.Setup(ev => ev.Count())              
            .Returns(events.Count);

        IEventRepository EventsMockDatabase = mockEventsRepository.Object;

        var eventLogObjects = new List<EventLogObj>();
        var duplicateEventLogObjects = new List<EventLogObj>();

        foreach (EventLogObj elo in EventsMockDatabase.GetEvents())
        {
            var existing = eventLogObjects.Where(
                e => e.TableKey.Equals(elo.TableKey)
            ).ToList();

            if (existing.Count == 0)
            {
                eventLogObjects.Add(elo);
            }
            else
            {
                duplicateEventLogObjects.Add(elo);
            }
        }

        Assert.AreEqual(2, duplicateEventLogObjects.Count);

        foreach (EventLogObj e in duplicateEventLogObjects)
        {
            // delete by id
            EventsMockDatabase.DeleteEvent(e.RecordId);
        }

        int count = events.Count; // EventsMockDatabase.Count(); // WHY!!!?

        Assert.AreEqual(3, count);
    }

Answer 1

当您 Setup Mock 时返回的值被存储，所以在这个例子中，初始列表的大小 (5)。

您可以通过使用委托设置模拟来绕过它：

mockEventsRepository.Setup(ev => ev.Count())
    .Returns(() => { return events.Count; });

顺便说一句，您确实知道您当前的测试不会测试任何生产代码，它只是测试您是否已将模型设置为模拟存储库？

C# 使用 Moq 从模拟存储库中删除项目

C# using Moq to delete items from a Mock Repository

c#

tdd

unit-testing