Runs the NUnit console test runner.
| Attribute | Description | Required | 
| vm | Same as dotnetexec's vm attribute. Specify the framework to use. | No. | 
| config | Config file to use | No. | 
| output | Where test output should go. | No. | 
| error | Where test error output should go. | No. | 
| xmlout | Where NUnit's XML output should go. | No. | 
| transform | The transformation to apply. | No. | 
| thread | Causes a separate thread to be created for running the tests - see the NUnit documentation for details. | No - defaults to false. | 
| noshadow | Disables shadow copying of the assembly in order to provide improved performance.. | No - defaults to false. | 
| fixture | Test fixture to run. | No. | 
| labels | Causes an identifying label to be displayed at the start of each test case. | No - defaults to false. | 
| failOnError | Stops the build if NUnit returns with a code indicating an error or failure. | No - defaults to false. | 
| errorProperty | Name of the Ant property to set if one of the tests fails/causes an error. Only useful if the failOnError attribute is set to false. | No. | 
testassembly has a single required attribute name -
    specifies an assembly or a project file holding tests.
in/exclude have a single required attribute name -
    specifies a category to include or exclude from the tests.
Note that in current versions of NUnit (up to 2.2) you may choose to either include or exclude categories in a run, but not both. This task does not enforce this restriction since future versions of NUnit may change behavior.
A nested I/O
    Redirector can be specified.  Any file mapping is done using a
    null sourcefile; therefore not all Mapper
    types will return results.
It is possible to specify environment variables to
    pass to the system command via nested <env>
    elements.  They support the same attributes as the nested env
    element of the <exec> task.
      <nunit>
        <testassembly name="nunit.tests.dll"/>
      </nunit>
    
    
    or
      <nunit>
        <testassembly name="nunit.tests.csproj"/>
      </nunit>
    
    
    
      <nunit fixture="NUnit.Tests.AssertionTests">
        <testassembly name="nunit.tests.dll"/>
      </nunit>
    
    
      <nunit>
        <testassembly name="nunit.tests.dll"/>
        <include name="Baseline"/>
      </nunit>
    
    
      <nunit xmlout="console-test.xml">
        <testassembly name="nunit.tests.dll"/>
      </nunit>
    
    changes the name of the output file to "console-test.xml" - note that this task will resolve file names relative to the project's base directory, not the current working directory.
      <nunit>
        <testassembly name="assembly1.dll"/>
        <testassembly name="assembly2.dll"/>
        <testassembly name="assembly3.dll"/>
      </nunit>
    
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