unit-testing - 使用 Moq 的 lambda 表达式 stub 上的参数计数不匹配

Question

当我想测试我的租户存储库时，出现“参数计数不匹配”TargetParameterCountException:

界面:

public interface ITenantRepository
{
    IQueryable<Tenant> Get(Expression<Func<Tenant, bool>> filter = null,
    Func<IQueryable<Tenant>, IOrderedQueryable<Tenant>> orderBy = null,
    string includeProperties = null);
}

测试代码:

var TenantRepository = new Mock<ITenantRepository>();

TenantRepository
    .Setup(p => p.Get(It.IsAny<Expression<Func<Tenant, bool>>>(),
        It.IsAny<Func<IQueryable<Tenant>,IOrderedQueryable<Tenant>>>() ,
        It.IsAny<string>()))
    .Returns(new Func<Expression<Func<Tenant, bool>>,
       IQueryable<Tenant>>(expr => Tenants.Where(expr.Compile()).AsQueryable()));

Tenant TestTenant = TenantRepository.Object.Get(
      t => t.TenantID == Tenant2.TenantID,
      null,
      null).FirstOrDefault();

错误发生在最后一行。

Answer 1

找到正确参数的解决方案:

TenantRepository.Setup(p => p.Get(It.IsAny<Expression<Func<Tenant, bool>>>(),
                                  It.IsAny<Func<IQueryable<Tenant>, IOrderedQueryable<Tenant>>>(),
                                  It.IsAny<string>()))
                .Returns(
                         (Expression<Func<Tenant, bool>> expr, 
                          Func<IQueryable<Tenant>, IOrderedQueryable<Tenant>> orderBy,
                          string includeProperties) => Tenants.Where(expr.Compile()).AsQueryable());