[英]Setup and verify expression with Moq
有没有办法设置和验证使用Moq表达式的方法调用?
第一次尝试是我想让它工作的那个,而第二次尝试是让Assert
部分工作的“补丁”(验证部分仍然失败)
string goodUrl = "good-product-url";
[Setup]
public void SetUp()
{
productsQuery.Setup(x => x.GetByFilter(m=>m.Url== goodUrl).Returns(new Product() { Title = "Good product", ... });
}
[Test]
public void MyTest()
{
var controller = GetController();
var result = ((ViewResult)controller.Detail(goodUrl)).Model as ProductViewModel;
Assert.AreEqual("Good product", result.Title);
productsQuery.Verify(x => x.GetByFilter(t => t.Url == goodUrl), Times.Once());
}
在Assert
测试失败并抛出空引用异常,因为从不调用方法GetByFilter。
如果相反我使用它
[Setup]
public void SetUp()
{
productsQuery.Setup(x => x.GetByFilter(It.IsAny<Expression<Func<Product, bool>>>())).Returns(new Product() { Title = "Good product", ... });
}
测试通过了Assert部分,但这次是验证失败,说它从未被调用过。
有没有办法用特定的表达式设置方法调用,而不是使用泛型It.IsAny<>()
?
更新
我在评论中也尝试了UfukHacıoğulları的建议并创建了以下内容
Expression<Func<Product, bool>> goodUrlExpression = x => x.UrlRewrite == "GoodUrl";
[Setup]
public void SetUp()
{
productsQuery.Setup(x => x.GetByFilter(goodUrlExpression)).Returns(new Product() { Title = "Good product", ... });
}
[Test]
public void MyTest()
{
...
productsQuery.Verify(x => x.GetByFilter(goodUrlExpression), Times.Once());
}
但是我得到了一个空引用异常,就像在第一次尝试中一样。
我的控制器中的代码如下
public ActionResult Detail(string urlRewrite)
{
//Here, during tests, I get the null reference exception
var entity = productQueries.GetByFilter(x => x.UrlRewrite == urlRewrite);
var model = new ProductDetailViewModel() { UrlRewrite = entity.UrlRewrite, Culture = entity.Culture, Title = entity.Title };
return View(model);
}
以下代码演示了如何在此类方案中进行测试。 一般的想法是你对“真实”数据执行传入的查询。 这样,您甚至不需要“验证”,就好像查询不对,它将无法找到数据。
修改以满足您的需求:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using Moq;
using NUnit.Framework;
namespace StackOverflowExample.Moq
{
public class Product
{
public string UrlRewrite { get; set; }
public string Title { get; set; }
}
public interface IProductQuery
{
Product GetByFilter(Expression<Func<Product, bool>> filter);
}
public class Controller
{
private readonly IProductQuery _queryProvider;
public Controller(IProductQuery queryProvider)
{
_queryProvider = queryProvider;
}
public Product GetProductByUrl(string urlRewrite)
{
return _queryProvider.GetByFilter(x => x.UrlRewrite == urlRewrite);
}
}
[TestFixture]
public class ExpressionMatching
{
[Test]
public void MatchTest()
{
//arrange
const string GOODURL = "goodurl";
var goodProduct = new Product {UrlRewrite = GOODURL};
var products = new List<Product>
{
goodProduct
};
var qp = new Mock<IProductQuery>();
qp.Setup(q => q.GetByFilter(It.IsAny<Expression<Func<Product, bool>>>()))
.Returns<Expression<Func<Product, bool>>>(q =>
{
var query = q.Compile();
return products.First(query);
});
var testController = new Controller(qp.Object);
//act
var foundProduct = testController.GetProductByUrl(GOODURL);
//assert
Assert.AreSame(foundProduct, goodProduct);
}
}
}
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