奇怪的“预期对模拟至少调用一次，但从未执行过”我设置模拟时出错

Question

我通过 NUnit 从 Moq 收到此错误，这对我来说没有多大意义。

“预期在模拟上至少调用一次，但从未执行过：x => x.DeleteItem(.$VB$Local_item)”

“在 Moq.Mock.ThrowVerifyException(MethodCall Expects, IEnumerable1 setups, IEnumerable< /code>1actualCalls，Expression表达式，Times次，Int32 callCount) 在 Moq.Mock.VerifyCalls（拦截器 targetInterceptor，预期 MethodCall，表达式表达式，Times 次） 在 Moq.Mock.Verify[T](Mock 模拟，Expression1 表达式，Times 次，String failureMessage) 在 Moq.Mock1.Verify(Expression`1 表达式) 在 PeekABookEditor.UnitTests.ItemBrowsing.Can_Delete_Item() in C:\Projects\MyProject\MyProject.UnitTests\Tests\ItemBrowsing.vb:line 167"

非常相似的代码在 C# 中运行良好，因此对我而言，错误可能很小且语法错误这

是我的代码：

    <Test()> _
Public Sub Can_Delete_Item()
    'Arrange: Given a repository containing some item...
    Dim mockRepository = New Mock(Of IItemsRepository)()
    Dim item As New Item With {.ItemID = "24", .Title = "i24"}

    mockRepository.Setup(Function(x) x.Items).Returns(New Item() {item}.AsQueryable())

    'Act ... when the user tries to delete that product
    Dim controller = New ItemsController(mockRepository.Object)
    Dim result = controller.Delete(24)

    'Assert ... then it's deleted, and the user sees a confirmation
    mockRepository.Verify(Sub(x) x.DeleteItem(item))
    result.ShouldBeRedirectionTo(New With {Key .action = "List"})
    Assert.AreEqual(DirectCast(controller.TempData("message"), String), "i24 was deleted")

End Sub

有罪的行似乎是“mockRepository.Verify(Sub(x)” x.DeleteItem(item))"

关于如何解决此问题有什么想法吗？

工作 C# 代码并不完全相同，但它是：

[Test] 
public void Can_Delete_Product() 
{ 
// Arrange: Given a repository containing some product... 
var mockRepository = new Mock<IProductsRepository>(); 
var product = new Product { ProductID = 24, Name = "P24"}; 
mockRepository.Setup(x => x.Products).Returns( 
    new[] { product }.AsQueryable() 
); 

// Act: ... when the user tries to delete that product 
var controller = new AdminController(mockRepository.Object); 
var result = controller.Delete(24); 

// Assert: ... then it's deleted, and the user sees a confirmation
mockRepository.Verify(x => x.DeleteProduct(product)); 
result.ShouldBeRedirectionTo(new { action = "Index" }); 
controller.TempData["message"].ShouldEqual("P24 was deleted"); 

}

Answer 1

在 VB 测试方法中，您使用字符串 ItemID = "24" 创建 Item，但使用整数调用 controller.Delete 方法值为24。

检查您的控制器代码并查看类型差异是否会导致项目无法正确识别，因此要么根本不调用 DeleteItem，要么使用不同的 Item 调用。