Torbjörn Nomell’s blog  |
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| Written by: Torbjörn Nomell | TDD |
| 2011/05/31 |
| Enhance unit tests by checking coverage |
When adding unit tests it can sometimes be hard to get an overview of how much code is covered, especially when adding tests to existing code.
Why not try a code coverage tool? I tried PartCover, it's free and open source software. Here's how to use it with Nunit.
• Click File -> Run target
• Edit settings
• Executable file: Full path to nunit-console.exe
• Working directory: Path to NUnit directory
• Working arguments: Path to test assemblies, delimited by spaces, DON’T forget /noshadow flag (to get source code from NUnit)
• Rules: Specify Assemblies to test and Namespaces eg. +[Assembly]Namespace (Start with +[*]* to get everything)
• Don't forget to save settings when satisfied
• Start
• Wait
• Browse the resulting tree
• Click Views -> View coverage details to see source code
.NET 4? Be aware!
If your test assemblies are compiled for .NET 4 then things might not work.
That’s because NUnit doesn't support .NET 4 by default(?). I had to add the following to nunit-console.exe.config
<startup>
<requiredRuntime version='v4.0.30319' />
</startup>
Coverage != Quality
Just remember that good code coverage cannot be interpreted as good quality of unit tests and the aim of 100% coverage have several drawbacks. |
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| Written by: Torbjörn Nomell | TDD |
| 2011/05/27 |
| Test all C# enum values with NUnit |
I just tried to find a nice way to test all combinations of input parameters to a test case where one of the parameters is a C# enum. The thing is that I don't want to test the current range of enums but also those added in future. I found a blogpost about how to solve this with the TestCaseSource attribute. ValuesSource attribute could also be used if there are more input parameters to test. But the nicest way I could find out to do this was to extend NUnit with a new attribute.
[AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
public class EnumValuesAttribute : ParameterDataAttribute
{
protected System.Collections.ICollection data;
public EnumValuesAttribute(Type anEnum)
{
this.data = Enum.GetValues(anEnum);
}
public override System.Collections.IEnumerable GetData
(System.Reflection.ParameterInfo parameter)
{
return this.data;
}
}
Now our tests can look like this:
[Test]
public void Test(
[EnumValues(typeof(MyEnum))]MyEnum val,
[Values(true,false)]bool isNewUser)
{
}
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| Written by: Torbjörn Nomell | .NET |
| 2011/05/25 |
| NServiceBus |
Had the opportunity to hear Udi Dahan and Andreas Öhlund talk about NServiceBus last week. To really understand what NServiceBus is all about I think I’ll have to download it and fiddle with it or maybe read some more blog posts. What I did understand that it’s a really cool architectural component that can simplify and enhance the systems we build. Not to mention sagas, which I have to dig in to a lot deeper. Udi is a good speaker and he can really captivate the audience. |
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| Written by: Torbjörn Nomell | .NET |
| 2011/04/14 |
| CQRS and Event Sourcing Seminar |
I went to a seminar at Avega yesterday. The speaker was Andreas Öhlund and the subject was the Command-Query separation principle and Event sourcing. I’ve read some blogs about CQRS and we’re using a subset of the principle in my current project. Andreas gave us a walkthrough of the principle.
After the break he moved on to Event Sourcing which is totally new for me, this was an eye opener of a different way to think. I won’t try to explain anything here but if it sounds interesting try google it or read some blog posts of Greg Young.
I wonder how adopted these ideas will be in let’s say five years. Probably we will see the amount of CQRS frameworks evolve, like NCQRS, I haven’t had a chance to examine NCQRS yet but that will be interesting. |
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I work as a system developer consultant. In this blog I share my thougths about .NET system development.