How to mock DbContext [duplicate]

问题

Here is the code I want to test

public DocumentDto SaveDocument(DocumentDto documentDto)
{
    Document document = null;
    using (_documentRepository.DbContext.BeginTransaction())
    {
        try
        {
            if (documentDto.IsDirty)
            {
                if (documentDto.Id == 0)
                {
                    document = CreateNewDocument(documentDto);
                }
                else if (documentDto.Id > 0)
                {
                    document = ChangeExistingDocument(documentDto);
                }

                document = _documentRepository.SaveOrUpdate(document);
                _documentRepository.DbContext.CommitChanges();
        }
    }
    catch
    {
        _documentRepository.DbContext.RollbackTransaction();
        throw;
    }
}
return MapperFactory.GetDocumentDto(document);

}

And here is my test code

[Test]
public void SaveDocumentsWithNewDocumentWillReturnTheSame()
{
    //Arrange

    IDocumentService documentService = new DocumentService(_ducumentMockRepository,
            _identityOfSealMockRepository, _customsOfficeOfTransitMockRepository,
            _accountMockRepository, _documentGuaranteeMockRepository,
            _guaranteeMockRepository, _goodsPositionMockRepository);
    var documentDto = new NctsDepartureNoDto();


    //Act
    var retDocumentDto = documentService.SaveDocument(documentDto);

    //Assert
    Assert.AreEqual(documentDto, documentDto);
}

Once I run the test I get Null exception for the DbContext on the line

 using (_documentRepository.DbContext.BeginTransaction())

The problem I have is I don't have access to the DbContext. How would I go about solving it

回答1:

As far as I understand you are injecting the repository through the constructor of Document Service as ducumentMockRepository. So you can setup this mock with any expectations you want.

For your case you've to substitute DbContext by mock as well

// I hope you have an interface to abstract DbContext?
var dbContextMock = MockRepository.GenerateMock<IDbContext>();

// setup expectations for DbContext mock
dbContextMock.Expect(...)

// bind mock of the DbContext to property of repository.DbContext
ducumentMockRepository.Expect(mock => mock.DbContext)
                      .Return(dbContextMock)
                      .Repeat()
                      .Any();

来源：https://stackoverflow.com/questions/7609430/how-to-mock-dbcontext

标签

entity-framework

unit-testing

nunit

dbcontext