模拟存储库的问题

Question

我有一个包含以下方法的服务，它查询存储库，如下所示：

public IEnumerable<Variable> ListVariables(int instanceId, int instanceVersionId, TypeGroup typeGroup)
{
    return
        _variableRepository.Where(x => x.InstanceVersion.Instance.Id == instanceId && x.InstanceVersion.Version == instanceVersionId && x.VariableType.VariableTypeGroup.Id == Convert.ToInt32(typeGroup));
}   

我正在尝试编写一个单元测试来模拟此调用，如下所示：

[Test]
        public void ListVariables_Returns_Variables_From_Repository()
        {
            IEnumerable<Variable> reposVariables = new List<Variable>
                                                    {
                                                        new Variable {InstanceVersion = new InstanceVersion(), VariableType = new VariableType(), Value = "test value1"},
                                                        new Variable {InstanceVersion = new InstanceVersion(), VariableType = new VariableType(), Value = "test value2"},
                                                        new Variable {InstanceVersion = new InstanceVersion(), VariableType = new VariableType(), Value = "test value3"},
                                                        new Variable {InstanceVersion = new InstanceVersion(), VariableType = new VariableType(), Value = "test value4"}
                                                    };

            var mockVariableRepository = new Mock<IVariableRepository>();
            mockVariableRepository.Setup(y => y.Where(x => x.InstanceVersion.Instance.Id == 1 && x.InstanceVersion.Version == 1 && x.VariableType.VariableTypeGroup.Id == 1)).Returns(reposVariables).Verifiable();

            var service = CreateSpiralService(variableRepository: mockVariableRepository.Object);

            var result = service.ListVariables(1,1,TypeGroup.Information).ToList<Variable>();

            mockVariableRepository.Verify(y => y.Where(x => x.InstanceVersion.Instance.Id == 1 && x.InstanceVersion.Version == 1 && x.VariableType.VariableTypeGroup.Id == 1), Times.Once()); ;
            Assert.AreEqual(reposVariables, result);
        }

但是当我运行它时，我收到以下错误：

Moq.MockException : 
Expected invocation on the mock once, but was 0 times: y => y.Where(x => (x.InstanceVersion.Instance.Id == 1 && x.InstanceVersion.Version == 1) && x.VariableType.VariableTypeGroup.Id == 1)

Configured setups:
y => y.Where(x => (x.InstanceVersion.Instance.Id == 1 && x.InstanceVersion.Version == 1) && x.VariableType.VariableTypeGroup.Id == 1), Times.Never

Performed invocations:
IReadOnlyNoIdRepository`1.Where(x => (((x.InstanceVersion.Instance.Id == value(Core.Services.Spiral.SpiralService+<>c__DisplayClass8).instanceId) AndAlso (x.InstanceVersion.Version == value(Core.Services.Spiral.SpiralService+<>c__DisplayClass8).instanceVersionId)) AndAlso (x.VariableType.VariableTypeGroup.Id == ToInt32(Convert(value(Core.Services.Spiral.SpiralService+<>c__DisplayClass8).typeGroup)))))

似乎表达式我传入的测试装置中存储库设置的一部分与服务本身定义的表达式不匹配。随后，最后的断言不成立，因为它“期望一个包含 4 个项目的列表，但实际上返回一个包含 0 个项目的列表”

有人知道可能会出现什么问题吗？

Answer 1

您使用的表达式与您设置的表达式不匹配。

您已经设置：

y => y.Where(x => (x.InstanceVersion.Instance.Id == 1 && x.InstanceVersion.Version == 1) && x.VariableType.VariableTypeGroup.Id == 1)

然而，您需要这样做：

m => m.ListVariables(
  It.Is<int>(i ==> i == 1), 
  It.Is<int>(i ==> i == 1), 
  It.Is<TypeGroup>(t => t == TypeGroup.Information))

Moq 将分析表达式以确定您何时执行：

var service.ListVariables(1, 1, TypeGroup.Information);

它将根据预期输入检查输入。

Answer 2

经过与同事进一步讨论，这似乎是 NHibernate 本身的问题。它与Where 语句中的两个（相同）条件不匹配。