起订量表达式<Func<> &gt;

Question

Im trying to mock Expression<Func<>> exactly how it should work in class that im testing.

My original declaration of this method looks like this:

var entity = await _repository.GetByIdAsync(input.Id1, x => x.Id2 == "Some String");

Now i want to mock that method using Moq :

// Arrange
entity.Id2 = "Some id";

// Act
_rRepositoryMock.Setup(x =>
    x.GetByIdAsync(
        It.Is<string>(y => y == input.Id1),
        It.Is<Expression<Func<MyEntity, object>>>(z => z.Id2 == "Some id")))
.ReturnsAsync(entity);

From Moq code i get this error, that Expression<Func<>> does not contein definition of Id2 .

How to Mock in Moq Expression<Func<>> to work exatly as i want to in original implementation?

EDIT

When i type something like:

It.Is<Expression<Func<MyEntity, object>>>(z => z = p => p.Id2 == "Some string")))

I get this error:

Severity Code Description Project File Line Suppression State Error CS1662 Cannot convert lambda expression to intended delegate type because some of the return types in the block are not implicitly convertible to the delegate return type

Severity Code Description Project File Line Suppression State Error CS0029 Cannot implicitly convert type 'System.Linq.Expressions.Expression>' to 'bool'

EDIT2

Signature of the method to mock:

Task<MyEntity> GetByIdAsync(string id, params Expression<Func<MyEntity, object>>[] @params);

Answer 1

I found solution. You dont need to mock Expression<Func>> , you can simply pass func to Moq like this:

_repositoryMock.Setup(x =>
    x.GetByIdAsync(
        It.Is<string>(y => y == input.Id1),
        z => z.Id2 == "Some id"))
.ReturnsAsync(entity);