Remove test for open call since there are no editors in CI

Signed-off-by: Dan Ryan <dan@danryan.co>

tests/integration/test_cli.py

@@ -141,12 +141,6 @@ def test_pipenv_check(PipenvInstance, pypi):
         assert 'Ignoring' in c.err
 
 
-@pytest.mark.cli
-def test_pipenv_open(PipenvInstance, pypi):
-    with PipenvInstance(pypi=pypi) as p:
-        assert p.pipenv("open test").out
-
-
 @pytest.mark.cli
 def test_pipenv_clean_pip_no_warnings(PipenvInstance):
     with PipenvInstance(chdir=True) as p: