我正在尝试测试存储库的Get方法。签名如下:
public virtual IEnumerable<TEntity> Get(
Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "")
通常以下列方式调用此方法:
Department targetDepartment =
_departmentRepository.Get(department => department.Id == departmentId).FirstOrDefault();
它可以很好地处理实际数据,当我尝试设置此方法以返回特定的部门时,它会正常运行。用特定的lambda来解决问题。
到目前为止,我已经尝试了很多方法来模拟它,其中一些是:
1)
Expression<Func<Department, bool>> filterExpression2 = d => d.Id == DepartmentId;
_departmentRepositoryMock.Setup(repo => repo.Get(
It.Is<Expression<Func<Department, bool>>>(y => filterExpression2.Compile()(firstDepartment)),
null,
It.IsAny<string>()))
.Returns(new List<Department>() { firstDepartment }.AsQueryable());
2)
Expression<Func<Department, bool>> filterExpression2 = d => d.Id == DepartmentId;
_departmentRepositoryMock.Setup(repo => repo.Get(
It.IsAny<Expression<Func<Department, bool>>>(),
null,
It.IsAny<string>()))
.Returns(new List<Department>() { firstDepartment }.Where(filterExpression2.Compile()).AsQueryable());
我看到很多类似的问题,但不知怎的,它们都没有用。
我要做的是强制模拟的存储库返回特定的部门,具体取决于&#39; Id&#39;参数发送到lambda。
我知道很多使用It.IsAny
的回复,但它不是我想要的,因为它会触发传递给Get方法的任何表达式的匹配。
任何人都可以帮助我,或者至少让我朝着正确的方向前进吗?
答案 0 :(得分:5)
尝试了以下最小例子并且能够通过测试。注意设置和返回。
[TestClass]
public class UnitTest11 {
[TestMethod]
public void TestMethod1() {
//Arrange
//fake data
var list = Enumerable.Range(1, 10).Select(id => new Department { Id = id }).ToList();
var mock = new Mock<IRepository<Department>>();
mock
.Setup(repo => repo.Get(
It.IsAny<Expression<Func<Department, bool>>>(),
null,
It.IsAny<string>())
)
.Returns(
(
Expression<Func<Department, bool>> filter,
Func<IQueryable<Department>, IOrderedQueryable<Department>> orderBy,
string includeProperties
) => {
var func = filter.Compile();
var result = list.Where(func);
if (orderBy != null) {
result = orderBy(result.AsQueryable());
}
return result;
}
);
var sut = new MyClass(mock.Object);
var departmentId = 2;
//Act
var actual = sut.GetDepartment(departmentId);
//Assert
Assert.IsNotNull(actual);
Assert.AreEqual(actual, list[departmentId - 1]);
}
public class MyClass {
private readonly IRepository<Department> _departmentRepository;
public MyClass(IRepository<Department> repository) {
this._departmentRepository = repository;
}
public Department GetDepartment(int departmentId) {
Department targetDepartment = _departmentRepository.Get(department => department.Id == departmentId).FirstOrDefault();
return targetDepartment;
}
}
public class Department {
public int Id { get; set; }
}
public interface IRepository<TEntity> {
IEnumerable<TEntity> Get(
Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = ""
);
}
}