new_contents: import parsenvy
  
  
  def test_str_valid(monkeypatch):
      """'bar'"""
      monkeypatch.setenv("foo", "bar")
  
      assert parsenvy.str("foo") == "bar"
  
  
  def test_str_empty(monkeypatch):
      """''"""
      monkeypatch.setenv("foo", "")
  
      assert parsenvy.str("foo", "bar") == "bar"
  
subject: Add str tests