new_contents: from io import BytesIO
  
  from zeus import factories
  from zeus.models import Artifact
  
  
  def test_new_artifact(client, default_source, default_repo, default_hook, sample_xunit):
      build = factories.BuildFactory(
          source=default_source,
          provider=default_hook.provider,
          external_id='3',
      )
  
      job = factories.JobFactory(
          build=build,
          provider=default_hook.provider,
          external_id='2',
          in_progress=True,
      )
  
      path = '/hooks/{}/{}/builds/{}/jobs/{}/artifacts'.format(
          default_hook.id, default_hook.get_signature(), build.external_id, job.external_id
      )
  
      resp = client.post(
          path,
          data={
              'name': 'junit.xml',
              'file': (BytesIO(sample_xunit.encode('utf-8')), 'junit.xml'),
          },
      )
  
      assert resp.status_code == 201, repr(resp.data)
      data = resp.json()
      artifact = Artifact.query.get(data['id'])
      assert artifact.file.filename.endswith('junit.xml')
  
subject: add tests for job artifacts