old_contents: from django.test import TestCase
  from viewflow.test import FlowTest
  from examples.helloworld.flows import HelloWorldFlow
  
  
  class HelloWorldFlowTests(TestCase):
      def test_normal_flow_succeed(self):
          with FlowTest(HelloWorldFlow) as flow:
              # The `employee` starts process
              flow.Task(HelloWorldFlow.start).User('helloworld/employee') \
                  .Execute() \
                  .Assert(lambda p: p.created is not None)
  
              # The `employee` grabs hello_request task and excutes it
              flow.Task(HelloWorldFlow.hello_request).User('helloworld/employee') \
                  .Execute({'text': 'Test Request'}) \
                  .Assert(lambda p: p.text == 'Test Request')
  
              # The `manager` approve the request
              flow.Task(HelloWorldFlow.approve).User('helloworld/manager') \
                  .Execute({'approved': True}) \
                  .Assert(lambda p: p.finished is None)
  
              # Send hello request succed
              flow.Task(HelloWorldFlow.send) \
                  .Execute() \
                  .Assert(lambda p: p.finished is not None)
  
new_contents: from django.test import TestCase
  from viewflow.test import FlowTest
  from examples.helloworld.flows import HelloWorldFlow
  
  
  class HelloWorldFlowTests(TestCase):
      def test_normal_flow_succeed(self):
          with FlowTest(HelloWorldFlow) as flow:
              # The `employee` starts process
              flow.Task(HelloWorldFlow.start).User('helloworld/employee') \
                  .Execute({'text': 'Test Request'}) \
                  .Assert(lambda p: p.created is not None)
  
              # The `manager` approve the request
              flow.Task(HelloWorldFlow.approve).User('helloworld/manager') \
                  .Execute({'approved': True}) \
                  .Assert(lambda p: p.finished is None)
  
              # Send hello request succed
              flow.Task(HelloWorldFlow.send) \
                  .Execute() \
                  .Assert(lambda p: p.finished is not None)
  
subject: Fix helloworld test