new_contents: import pytest
  
  from frigg.projects.models import EnvironmentVariable, Project
  
  
  @pytest.fixture
  def project():
      return Project(owner='frigg', name='frigg-hq')
  
  
  def test_environment_variable__str__(project):
      variable = EnvironmentVariable(project=project, key='PYPI_PASSWORD')
      assert str(variable) == 'frigg / frigg-hq - PYPI_PASSWORD'
  
subject: Add test for str in EnvironmentVariable