Config.groovy

app.parentname = "objectpartners.com"

environments {
  test {
    app.parentname = "danveloper.com"
  }
}

CustomerIntegrationTests.groovy

class CustomerIntegrationTests extends GroovyTestCase {
  // DI
  def grailsApplication
  
  void testProps() {
    def customer = grailsApplication.mainContext.getBean(Customer)
    assert customer.parentName == "danveloper.com"
  }
}