Inject context into groovy class

Hi

I am trying to structure my groovy a bit more with classes. However now I get an error saying groovy.lang.MissingPropertyException: No such property: context for class: GameWSTool
My class is this:

class GameWSTool{


def groovyUtils = new com.eviware.soapui.support.GroovyUtils( context ) 
def project = context.testCase.testSuite.project
def testSuite = project.testSuites['StartingPoint'];
def testCase = testSuite.getTestCaseAt(1) //GenerateInputData

def noItems = 10
def i =0
def sb = new SwingBuilder()

  static void main(String[] args){
    def tool = new GameWSTool()
    tool.show()
  }

Do I need to inject the context somehow?

Thanks