Question

我正在编写单元测试来测试Save DbSet的变化。代码如下：

PreSchoolContext

DbSet<Student> Students{get;set;}

PreSchoolRepository

编辑：PreSchoolContext现在是一个IPreSchoolContext实例，通过依赖注入处理。

public async Task<int> UpdatePreSchoolStudentAsync(Student student)
{   
    PreSchoolContext.Set<Student>().AddOrUpdate(student);
    var result = await PreSchoolContext.SaveChangesAsync().ConfigureAwait(false);
    return result;              
}

测试方法

//Arrange
var data = GetStudents().AsQueryable();
var mockSet = new Mock<DbSet<Student>>();
mockSet.As<IQueryable<Student>>().Setup(m => m.Provider).Returns(new TestDbAsyncQueryProvider<Student>(data.Provider));
mockSet.As<IQueryable<Student>>().Setup(m => m.Expression).Returns(data.Expression);

var preSchoolContextMock = new Mock<IPreSchoolContext>();
preSchoolContextMock.Setup(c => c.Students).Returns(mockSet.Object);

var repo = new PreSchoolRepository(preSchoolContextMock.Object);

//Act
var preSchoolStudentUpdateFlag = await repo.UpdatePreSchoolStudentAsync(data.FirstOrDefault());

//Assert
preSchoolStudentUpdateFlag.ShouldNotBeNull();
preSchoolStudentUpdateFlag.ShouldBe(1);

错误

无法在派生的IDbSet类型'Castle.Proxies.DbSet`1Proxy'上调用public，实例方法AddOrUpdate。找不到方法。

无法理解正确设置模拟数据的缺失。

Answer 1

我在设计中进行了一些更改以测试DbSet<> 更新功能：

在我的上下文类下添加了以下功能：

public virtual void AddOrUpdateEntity<TEntity>(IProMetrixContext db, 
TEntity[] entities) where TEntity : class
{
     db.Set<TEntity>().AddOrUpdate(entities);
}

然后将UpdatePreSchoolStudentAsync(Student student)方法略微更改为：

public async Task<int> UpdateProMetrixRiskAsync(Student student)
{
        PreSchoolContext.AddOrUpdateEntity<Student>(PreSchoolContext, student); //This one resolved issue of unit test and works fine in real scenario too.
        var result = await PreSchoolContext.SaveChangesAsync().ConfigureAwait(false);
        return result;
}

在这里引用LINK

注意：如果有人对此有任何建议，请发帖。

无法正确MOCK DbSet以测试基础实体的更新功能

1 个答案: