[英]How to set up a concrete Expression<Func<TEntity, bool>> to a mock in a unit test through Moq?
[英]Moq with exact Expression<Func<TEntity, bool>>
我正在嘗試測試存儲庫的Get方法。 簽名如下:
public virtual IEnumerable<TEntity> Get(
Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "")
通常以下列方式調用此方法:
Department targetDepartment =
_departmentRepository.Get(department => department.Id == departmentId).FirstOrDefault();
它適用於真實數據,當我嘗試設置此方法以返回具有問題開始的特定lambda的特定“部門”時。
到目前為止,我已經嘗試了很多方法來模擬它,這里有一些:
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());
我看到了許多類似的問題,但不知怎的,它們都沒有用。
我想要做的是強制模擬的存儲庫返回一個特定的部門,具體取決於發送給lambda的'Id'參數。
我知道許多使用It.IsAny
響應,但它不是我想要的,因為它會在字面上觸發傳遞給Get方法的任何表達式的匹配。
誰能幫助我,或者至少讓我朝着正確的方向前進?
嘗試了以下最小的例子,並且能夠通過測試。 注意設置和返回。
[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 = ""
);
}
}
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