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Parameter values not passed into method of mocked object

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Simon
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Simon asked on 24 Jun 2013, 10:13 AM
I've set up a mocked object with a couple of arranged methods. How do I pass in parameters to exercise the arranged methods?
When i call target.GetValue with 5/Aug/2012, the GetData method receives the value of 1/Jan/1983 in its startDate parameter. What do i need to do in order for the arranged methods to receive the required parameter value?

------- set up mocking ------------
            var dataAccess = Mock.Create<IDataAccess>();
            Mock.Arrange(() => dataAccess.DataExists(Arg.IsAny<SiteLocation>(), Arg.Matches<DateTime>(d => d >= startDate), Arg.Matches<DateTime>(d => d <= endDate))).Returns(true);
            Mock.Arrange(() => dataAccess.RetrieveData(Arg.IsAny<SiteLocation>(), Arg.Matches<DateTime>(d => d >= startDate), Arg.Matches<DateTime>(d => d <= endDate))).Returns(data);
            DataLoader target = new DataLoader(dataAccess);

            // act
            int actual;
            actual = target.GetValue(location, date)[0];

-------------------- called method on non-mocked object ---------------
        public List<int> GetValue(SiteLocation location, DateTime date)
        {
            var data = new List<int>();

            var temp = GetData(location, date, DateTime.Now);
            if (temp.Count > 0)
            {
                // todo: if there are gaps in the data fill with -999
                data = temp.Select(t => t.Value).ToList();
            }
            else { }

            return data;
        }

------------------------ called method on mocked object ------------------
        public List<DataRecord> GetData(SiteLocation location, DateTime startDate, DateTime endDate)
        {
            var data = new List<DataRecord>();

            if (dataAccess.DataExists(location, startDate, endDate))
            {
                data = dataAccess.RetrieveData(location, startDate, endDate);
            }else{}

            return data;
        }

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Kaloyan
Telerik team
answered on 24 Jun 2013, 03:14 PM
Hello Simon,

Thank you for contacting our support central with such a detailed message.

For the purpose of testing, I managed write the missing parts like this:
public class DataLoader
{
    public IDataAccess dataAccess;
 
    public DataLoader(IDataAccess dataA)
    {
        this.dataAccess = dataA;
    }
 
    public List<int> GetValue(SiteLocation location, DateTime date)
    {
        var data = new List<int>();
 
        var temp = GetData(location, date, DateTime.Now);
        if (temp.Count > 0)
        {
            // todo: if there are gaps in the data fill with -999
            data = temp.Select(t => t.Value).ToList();
        }
        else { }
 
        return data;
    }
 
    public List<DataRecord> GetData(SiteLocation location, DateTime startDate, DateTime endDate)
    {
        var data = new List<DataRecord>();
 
        if (dataAccess.DataExists(location, startDate, endDate))
        {
            data = dataAccess.RetrieveData(location, startDate, endDate);
        }
        else { }
 
        return data;
    }
}
 
public interface IDataAccess
{
    bool DataExists(SiteLocation location, DateTime startDate, DateTime endDate);
 
    List<DataRecord> RetrieveData(SiteLocation location, DateTime startDate, DateTime endDate);
}
 
public class DataRecord
{
    public int Value;
}
 
public class SiteLocation
{
     
}

Having the above, I finished your test method the following way:
[TestMethod]
public void GetValue_ShouldReturnFakeCollectionMember()
{
    List<DataRecord> data = new List<DataRecord>()
    {
        new DataRecord() {Value = 1},
        new DataRecord() {Value = 2},
    };
    SiteLocation location = new SiteLocation();
    DateTime date = new DateTime(2012, 8, 5); // 5/Aug/2012
    DateTime startDate = new DateTime(2011, 8, 5); // 5/Aug/2012 - Start date should be <= than "date"
    DateTime endDate = new DateTime(2014, 8, 5); // 5/Aug/2014 - End date should be >= than DateTime.Now
 
    // Arrange
    var dataAccess = Mock.Create<IDataAccess>();
 
    Mock.Arrange(() => dataAccess.DataExists(Arg.IsAny<SiteLocation>(),
                            Arg.Matches<DateTime>(d => d >= startDate),
                            Arg.Matches<DateTime>(d => d <= endDate)))
                    .Returns(true);
    Mock.Arrange(() =>  dataAccess.RetrieveData(Arg.IsAny<SiteLocation>(),
                            Arg.Matches<DateTime>(d => d >= startDate),
                            Arg.Matches<DateTime>(d => d <= endDate)))
                    .Returns(data);
 
    // Act
    DataLoader target = new DataLoader(dataAccess);
 
    int actual;
    actual = target.GetValue(location, date)[0];
 
    // Assert
    Assert.AreEqual(1, actual);
}
I haven`t changed your arrangements and the test passes as expected. The only thing I needed to take into consideration is that, inside the GetValue() method, you are calling DetData() with DateTime.Now for endDate argument. This means, you will need to pass a future time as an argument expectation for the endDate as well.

I hope this helps. Please, do not hesitate to contact us further if there are more issues.

Regards,
Kaloyan
Telerik
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Simon
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answered on 27 Jun 2013, 11:34 AM
Thanks,

I've adjusted the arrangements so they no longer check the endDate as the exact endDate value used is not known at this point.

Mock.Arrange(() => dataAccess.DataExists(Arg.IsAny<SiteLocation>(), Arg.Matches<DateTime>(d => d >= startDate), Arg.IsAny<DateTime>())).Returns(true);
Mock.Arrange(() => dataAccess.RetrieveData(Arg.IsAny<SiteLocation>(), Arg.Matches<DateTime>(d => d >= startDate), Arg.IsAny<DateTime>())).Returns(data);
            var target = new SunDataLoader(dataAccess);

The 1/Jan/1983 value came from another piece of code and was nothing to do with the mocking.
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Kaloyan
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Simon
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