Test that setenv respects PYTHONPATH and triggers no warnings

Author: jarshwah

tests/test_venv.py

@@ -597,11 +597,11 @@ def test_env_variables_added_to_pcall(tmpdir, mocksession, newconfig, monkeypatc
         passenv = x123
         setenv =
             ENV_VAR = value
+            PYTHONPATH = value
     """)
     mocksession._clearmocks()
 
     venv = VirtualEnv(config.envconfigs['python'], session=mocksession)
-    # import pdb; pdb.set_trace()
     mocksession.installpkg(venv, pkg)
     venv.test()
 
@@ -614,13 +614,18 @@ def test_env_variables_added_to_pcall(tmpdir, mocksession, newconfig, monkeypatc
         assert env['ENV_VAR'] == 'value'
         assert env['VIRTUAL_ENV'] == str(venv.path)
         assert env['X123'] == "123"
+        assert 'PYTHONPATH' in env
+        assert env['PYTHONPATH'] == 'value'
     # all env variables are passed for installation
     assert l[0].env["YY"] == "456"
     assert "YY" not in l[1].env
 
     assert set(["ENV_VAR", "VIRTUAL_ENV", "PYTHONHASHSEED", "X123", "PATH"])\
         .issubset(l[1].env)
 
+    # setenv does not trigger PYTHONPATH warnings
+    mocksession.report.not_expect("warning", "*Discarding $PYTHONPATH from environment*")
+
     # for e in os.environ:
     #    assert e in env