Question

我有具有功能声明的IGeneric存储库

T FindBy(Expression<Func<T, bool>> predicate);

和Generic Repository Class

public T FindBy(System.Linq.Expressions.Expression<Func<T, bool>> predicate)
    {
        return _dbset.FirstOrDefault(predicate);
    }

并拥有单元Test class，创建一个模拟存储库并将数据初始化到模拟数据库

[TestClass]
public class ServiceTest
{
    private IClientRepository mockClientRepository;
public ServiceTest()
    {
        IList<ClientData> client = new List<ClientData>
            {
                new ClientData{ Name= "Mike", Address ="Uk" },
                new ClientData{ Name= "Jane", Address ="US" },
            };
         Mock<IClientRepository> _mockRepository = new Mock<IClientRepository>();
        _mockRepository.Setup(m => m.FindBy(It.IsAny<Expression<Func<ClientData, bool>>>())).Returns((string apiClient) =>
        {
            var data = client.Where(x => x.Hash == apiClient).FirstOrDefault();
            return data;
        });
this.mockClientRepository = _mockRepository.Object;
} 
[TestMethod]
public void IsDataFindByName()
    {
        ClientData testResult = this.mockClientRepository.FindBy(i => i.Name== "Mike");
        Assert.IsNotNull(testResult);
    }

我在运行测试时发现了一个例外

Additional information: Object of type 'System.Linq.Expressions.Expression`1[System.Func`2[Adminportal.Entities.ClientData ,System.Boolean]]' cannot be converted to type 'System.String'.

我不知道如何传递它，

Answer 1

参数丰富的Returns方法期望其参数与mocked方法的参数类型相同。如果需要.Returns((string apiClient)，请使用Expression<Func<ClientData, bool>>。只需将其更改为：

.Returns((Expression<Func<ClientData, bool>> expression) =>
{
    var data = client.Where(expression.Compile()).FirstOrDefault();
    return data;
});

如何在moq Repository中执行表达式？

1 个答案: