Moq&EF6 - 模拟EF6移除方法不移除对象

Question

我试图模仿我EF6 DbContext,这一切工程Add,Update,Find方法.但它不适Remove用于未知原因的方法.

理论上,在移除后,Students集合应该只剩下1个返回.但它不断返回伯爵 - 2.

我进行了3次Moq .Verify检查以确保调用所有方法并确实执行它们.但它实际上并没有从学生合集中删除该项目.

如果我评论Assert.Equal检查计数的行,则整个测试通过.

删除XUnit方法

[Fact]
public void Delete()
{            
    Mock<DbContexts.MVCWebAppDbContext> dbContext = new Mock<DbContexts.MVCWebAppDbContext>();
    IStudentsService studentService = new StudentsService(dbContext.Object);

    var students = new List<Student>()
    {
        new Student() { StudentID = 1, RefNo = "12456343", FirstName = "John", LastName = "Smith", DateOfBirth = DateTime.Now.AddYears(-10), DateCreated = DateTime.Now },
        new Student() { StudentID = 2, RefNo = "87984564", FirstName = "Pete", LastName = "Luck", DateOfBirth = DateTime.Now.AddYears(-20), DateCreated = DateTime.Now.AddDays(1) }
    };

    var mockSet = new Mock<DbSet<Student>>();
    mockSet.As<IQueryable<Student>>().Setup(m => m.Provider).Returns(students.AsQueryable().Provider);
    mockSet.As<IQueryable<Student>>().Setup(m => m.Expression).Returns(students.AsQueryable().Expression);
    mockSet.As<IQueryable<Student>>().Setup(m => m.ElementType).Returns(students.AsQueryable().ElementType);
    mockSet.As<IQueryable<Student>>().Setup(m => m.GetEnumerator()).Returns(students.AsQueryable().GetEnumerator());

    mockSet.Setup(m => m.Remove(It.IsAny<Student>())).Callback<Student>((entity) => students.Remove(entity));

    dbContext.Setup(c => c.Students).Returns(mockSet.Object);

    int idToDelete = 1;

    dbContext.Setup(s => s.Students.Find(idToDelete)).Returns(students.Single(s => s.StudentID == idToDelete));

    // call delete method now
    studentService.Delete(idToDelete);

    // 1 object deleted, it should return 1
    Assert.Equal(1, students.Count());  // <----- Error here

    dbContext.Verify(s => s.Students.Find(idToDelete), Times.Once);
    dbContext.Verify(s => s.Students.Remove(It.IsAny<Student>()), Times.Once);
    dbContext.Verify(s => s.SaveChanges(), Times.Once);
}

StudentService.cs删除方法

MVCWebAppDbContext _context;

public StudentsService(MVCWebAppDbContext context)
{
    _context = context;
}

public int Delete(int id)
{
    var objToDelete = _context.Students.Find(id);

    if (objToDelete != null)
    {
        _context.Students.Remove(objToDelete);
        return _context.SaveChanges();
    }

    return -1;
}

你能帮我解决这个删除方法吗？

Answer 1

更换

mockSet
    .Setup(m => m.Remove(It.IsAny<Student>()))
    .Callback<Student>((entity) => students.Remove(entity));

同

dbContext
    .Setup(m => m.Students.Remove(It.IsAny<Student>()))
    .Callback<Student>((entity) => students.Remove(entity));

大多数设置都是使用DbContext.Students覆盖设置完成的DbSet.Remove

事实上,你实际上可以删除所有的DbSet模拟和测试仍然会通过

[Fact]
public void Delete() {
    var dbContext = new Mock<DbContexts.MVCWebAppDbContext>();
    IStudentsService studentService = new StudentsService(dbContext.Object);

    var students = new List<Student>()
    {
        new Student() { StudentID = 1, RefNo = "12456343", FirstName = "John", LastName = "Smith", DateOfBirth = DateTime.Now.AddYears(-10), DateCreated = DateTime.Now },
        new Student() { StudentID = 2, RefNo = "87984564", FirstName = "Pete", LastName = "Luck", DateOfBirth = DateTime.Now.AddYears(-20), DateCreated = DateTime.Now.AddDays(1) }
    };

    dbContext
        .Setup(m => m.Students.Remove(It.IsAny<Student>()))
        .Callback<Student>((entity) => students.Remove(entity));

    int idToDelete = 1;

    dbContext
        .Setup(s => s.Students.Find(idToDelete))
        .Returns(students.Single(s => s.StudentID == idToDelete));

    // call delete method now
    studentService.Delete(idToDelete);

    // 1 object deleted, it should return 1
    Assert.AreEqual(1, students.Count());

    dbContext.Verify(s => s.Students.Find(idToDelete), Times.Once);
    dbContext.Verify(s => s.Students.Remove(It.IsAny<Student>()), Times.Once);
    dbContext.Verify(s => s.SaveChanges(), Times.Once);
}