Question

我有一个假的存储库，我需要根据表达式返回不同的值

A.CallTo(() => repository.FirstOrDefaultAsync<Group>(x => x.Id == busMessage.Id && x.GroupType == ObjectType.Office)).Returns(dbOffice);
A.CallTo(() => repository.FirstOrDefaultAsync<Group>(x => x.Id == busMessage.Id && x.GroupType == ObjectType.Country)).Returns(dbCountry);

我尝试了不同的方法，但是没有运气任何建议表示赞赏

Answer 1

尝试单独定义您的表情。它对我有用。

using System;
using NUnit.Framework;
using FakeItEasy;
using System.Linq.Expressions;

namespace ClassLibraryTests
{
    [TestFixture]
    public class IRepositoryTests
    {
        private IRepository CreateSut(Expression<Func<Group, bool>> expression, object result)
        {
            IRepository sut = A.Fake<IRepository>();
            A.CallTo(() => sut.FirstOrDefaultAsync<Group>(expression)).Returns(result);
            return sut;
        }

        [Test]
        public void FirstOrDefaultAsyncTests_Office()
        {
            // Arrange    
            BusMessage busMessage = new BusMessage();
            Expression<Func<Group, bool>> expression = x => x.Id == busMessage.Id && x.GroupType == ObjectType.Office;
            object dbOffice = new object();

            IRepository repository = this.CreateSut(expression, dbOffice);

            // Act
            object obj = repository.FirstOrDefaultAsync<Group>(expression);

            //Assert
            Assert.AreEqual(obj, dbOffice);
        }

        [Test]
        public void FirstOrDefaultAsyncTests_Country()
        {
            // Arrange    
            BusMessage busMessage = new BusMessage();           
            Expression<Func<Group, bool>> expression = x => x.Id == busMessage.Id && x.GroupType == ObjectType.Country;
            object dbCountry = new object();

            IRepository repository = this.CreateSut(expression, dbCountry);

            // Act
            object obj = repository.FirstOrDefaultAsync<Group>(expression);

            //Assert
            Assert.AreEqual(obj, dbCountry);
        }
    }

    public interface IRepository
    {
        object FirstOrDefaultAsync<T>(Expression<Func<T, bool>> expression);
    }

    public class Group
    {
        public ObjectType GroupType { get; set; }
        public int Id { get; set; }
    }

    public class BusMessage
    {
        public int Id { get; set; }
    }

    public enum ObjectType
    {
        Office,
        Country
    }
}

FakeItEasy：根据表达式返回不同的对象

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