Need help with NUnit

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Hi
Im testing out some testing software well NUnit and TDD. while I can get TDD to work with no problem I am struggling to get NUnit working property.

Below is a simplified version of the class that I am running the test on.

C#

public class buildings : RatingBase
{
  public override decimal Premium()
  {
    //have stripped this down to show only the area that is causing the error
    decimal TAMultipler = TA();
  }

  private decimal TA()
  {
    string regions = RegionResults(Postcode);
  }
}

public abstract class RatingBase
{
  public string RegionResults(string Postcode, string Town = "")
  {
    using(DataContext db = new DataContext(ConfigurationManager.ConnectionStrings["connectionstring"].ToString())
    {
    }
  }
}

Now under Microsoft TDD it works as expected fails / passes on the assertion depending on the values I put in to compare against the result of Premium()

But when I try NUnit with the following test, which is the same test used in the TDD attempt. I have tried it with both the mock of the datacontext and without and the result is still the same.

C#

[TestFixture]
public class TestBuildings
{
    [Test]
    public void CalculateBuidings()
    {
        //string connection = "Data Source=oak_apps;Initial Catalog=Oak_Underwriting;Integrated Security=True";
        //Mock<DataContext> db = new Mock<DataContext>(connection);

        Buildings blds = new Buildings();
        blds.Postcode = "TN20 6JS";
        blds.Age = 54;
        blds.Occupation = "Insurance Company Director";
        blds.PropertyType = "Detached";
        blds.YearBuilt = 2012;
        blds.SumInsured = 2878500;
        blds.Excess = 500;

        blds.PercentageAdjustment = 0.855M;
        blds.MoneyAdjustment = 0;
        blds.Discretionary = 10;

        decimal value = blds.Premium();

        Assert.AreEqual(1792.809M, value);
    }
}

When I run it though Nunit test application it always throughs the following error

Rating.TestBuildings.CalculateBuidings:
System.NullReferenceException : Object reference not set to an instance of an object.

Am I missing something that I need to setup in the NUnit test? any pointers to get it working would be great!

Thanks
Simon

Posted 2-Oct-13 5:50am

Simon_Whale

Updated 2-Oct-13 21:28pm

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Rob Philpott 2-Oct-13 16:49pm

I can't see anything intrinsically wrong with that but I think you'd need to include more code. In particular when you debug the test, what line throws the exception?

Simon_Whale 3-Oct-13 3:29am

Thanks Rob, I've traced through the test and the line that caused the error is the using statement that connects to the database

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Fredrik Bornander · Accepted Answer · 2013-10-02T21:47:00

Solution 1

What does the app.config that's used when running NUnit look like?

This sounds very much like a case of missing configuration, try making sure the configuration you need exists in the app.config of the test project.

Hope this helps,
Fredrik

Posted 2-Oct-13 21:47pm

Fredrik Bornander

Comments

Simon_Whale 3-Oct-13 5:37am

Thank you very much Fredrik.

I assumed that the NUnit took the app config from the bin directory. After creating a app.config in the root of the rating class library project and running it again it worked as expected.

Fredrik Bornander 3-Oct-13 5:44am

Glad I could help.
You should mark the answer as accepted if it solved your problem so that we can close the question.

Rob Philpott · Accepted Answer · 2013-10-02T22:45:00

Ok, based on that - two things.

Firstly, I suspect that you may be using NUnit test runner, so I think it will be looking in that thing's app.config for the connection string rather than you app. That'd explain why it works with Microsoft's approach.

Other thing (maybe not important):

using(DataContext db = new DataContext(ConfigurationManager.ConnectionStrings["connectionstring"].ToString())

Should be:

using(DataContext db = new DataContext(ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString)

Either way, I bet that you are calling ToString() on a null!