我正在尝试使用MOQ框架对类进行单元测试。该类中的public方法的行如下所示。
看着那条线,我正在尝试模拟_currencyRepository
,但不知道该怎么做。考虑到它有一个像p => new { p.Id, p.Code }
这样的参数。
在分析代码时,看来这是一种输出P的方法-我相信是匿名方法。
var currencies = await _currencyRepository.GetsAs(p => new { p.Id, p.Code }, p => p.Id == sellCurrencyId || p.Id == buyCurrencyId);
将鼠标悬停在var上以了解获取返回类型的信息,tootip显示IEnumerable<'a> currencies. Anonymous types: 'a is new{Guid Id, string code}
。
..和GetAs的定义是:
public async Task<IEnumerable<TOutput>> GetsAs<TOutput>(Expression<Func<TEntity, TOutput>> projector,
Expression<Func<TEntity, bool>> spec = null,
Func<IQueryable<TEntity>, IQueryable<TEntity>> preFilter = null,
params Func<IQueryable<TEntity>, IQueryable<TEntity>>[] postFilters)
{
if (projector == null)
{
throw new ArgumentNullException("projector");
}
return await FindCore(true, spec, preFilter, postFilters).Select(projector).ToListAsync();
}
GetAs()还是通用类GenericRepository
中的成员/方法-其类定义为:
public class GenericRepository<TContext, TEntity> : IGenericRepository<TEntity>
where TEntity : BaseEntity
where TContext : DbContext
{
protected readonly TContext DbContext;
public GenericRepository(TContext dbContext)
{
DbContext = dbContext;
}
//followed by method definitions including GetAs
}
上面的类从通用接口IGenericRepository<TEntity>
继承,该接口定义为:
public interface IGenericRepository<TEntity>
where TEntity : class
{
//list of methods including GetAs
Task<IEnumerable<TOutput>> GetsAs<TOutput>(Expression<Func<TEntity, TOutput>> projector,
Expression<Func<TEntity, bool>> spec = null,
Func<IQueryable<TEntity>, IQueryable<TEntity>> preFilter = null,
params Func<IQueryable<TEntity>, IQueryable<TEntity>>[] postFilters);
... BaseEntity只是具有属性的类:
public class BaseEntity
{
public BaseEntity()
{
Id = Guid.NewGuid();
CreatedDate = DateTime.Now;
}
public Guid Id { get; set; }
public DateTime CreatedDate { get; set; }
public DateTime? UpdatedDate { get; set; }
public Guid? CreatedBy { get; set; }
public Guid? UpdateddBy { get; set; }
}
我已经有了要返回的货币列表,但参数有误。不确定使用什么参数匹配器(我知道参数匹配器是NSubstitute talk。不确定在Moq中是否被称为相同参数)
我尝试了很多事情。以下是其中之一:
var mockCurrencies3 = new[] { new { Id = buyCurrencyId, Code = "EUR" }, new { Id = sellCurrencyId, Code = "GBP" } };
MockCurrencyRepository.Setup(x => x.GetsAs(
It.IsAny<Expression<Func<Currency, (Guid, string)>>>(),
It.IsAny<Expression<Func<Currency, bool>>>(),
It.IsAny<Func<IQueryable<Currency>, IQueryable<Currency>>>()))
.Returns(Task.FromResult(mockCurrencies3.AsEnumerable()));
尝试上述操作无效,因为生产代码中未返回mockCurrencies3
值。我什么也没回来。
答案 0 :(得分:1)
使用提供的信息,我能够创建通用方法来设置所需的行为
[TestClass]
public class MyTestClass {
[TestMethod]
public async Task Should_Mock_Generic() {
Guid buyCurrencyId = Guid.NewGuid();
Guid sellCurrencyId = Guid.NewGuid();
var mockCurrencies3 = new[] { new { Id = buyCurrencyId, Code = "EUR" }, new { Id = sellCurrencyId, Code = "GBP" } };
var mock = new Mock<IGenericRepository<Currency>>();
SetupGetAs(mock, mockCurrencies3);
var _currencyRepository = mock.Object;
var currencies = await _currencyRepository.GetsAs(p => new { p.Id, p.Code }, p => p.Id == sellCurrencyId || p.Id == buyCurrencyId);
currencies.Should().NotBeNullOrEmpty();
}
Mock<IGenericRepository<TEntity>> SetupGetAs<TEntity, TOutput>(Mock<IGenericRepository<TEntity>> mock, IEnumerable<TOutput> source)
where TEntity : class {
mock.Setup(x => x.GetsAs(
It.IsAny<Expression<Func<TEntity, TOutput>>>(),
It.IsAny<Expression<Func<TEntity, bool>>>(),
It.IsAny<Func<IQueryable<TEntity>, IQueryable<TEntity>>>())
)
.ReturnsAsync(source);
return mock;
}
}