Question

I’m starting to use Moq and I cannot figure out how to test the method Execute in the code below:

I have the following class:

public class MyObject {
    private IDataReaderPlugin m_source;
    private IDataWriterPlugin m_dest;
    private string[] m_dummyTags = new string[] { "tag1", "tag2", "tag3"};

    public void Execute(DateTime time)
    {
        DataCollection tags = m_source.SnapshotUtc(m_dummyTags, time);

        //Doing some treatment on the values in tags    

        m_dest.Write(tags); 
    }

}

Another method is responsible to create and initialize IDataReaderPlugin and IDataWriterPlugin from information in a configuration file.

I want to test the method Execute. So, I need to mock m_source and m_dest and after I want to test the result sent to m_dest.

How I can achieve this with Moq?

Thanks.

Answer 1

This should get you started:

DateTime myDate = DateTime.Now;

DataCollection tags = new DataCollection();

Mock<IDataReaderPlugin> dataReaderPlugin = new Mock<IDataWriterPlugin>();
dataReaderPlugin.Setup(drp => drp.SnapshotUtc(It.IsAny<string[]>(), myDate)).Returns(tags);

Mock<IDataWriterPlugin> dataWriterPlugin = new Mock<IDataWriterPlugin>();
dataWriterPlugin.Setup(dwp => dwp.Write(tags);    

MyObject mo = new MyObject();
mo.Execute();

mock.Verify(foo => foo.Write(tags));