Test that envsitepackagesdir actually gets called

It's hard to check that the system integration part is correct without
reimplementing it in the test, but we can at least see if the method
gets called and doesn't crash.

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/test_config.py b/tests/test_config.py
index 9e088d4b..264710b5 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,6 +1,7 @@
 import tox
 import pytest
 import os, sys
+import subprocess
 from textwrap import dedent
 
 import py
@@ -590,6 +591,35 @@ class TestConfigTestEnv:
         assert conf.changedir.basename == 'testing'
         assert conf.changedir.dirpath().realpath() == tmpdir.realpath()
 
+    @pytest.mark.xfailif("sys.platform == 'win32'")
+    def test_substitution_envsitepackagesdir(self, tmpdir, monkeypatch,
+                                             newconfig):
+        """
+         The envsitepackagesdir property is mostly doing system work,
+         so this test doesn't excercise it very well.
+
+         Usage of envsitepackagesdir on win32/jython will explicitly
+         throw an exception,
+        """
+        class MockPopen(object):
+            returncode = 0
+
+            def __init__(self, *args, **kwargs):
+                pass
+
+            def communicate(self, *args, **kwargs):
+                return 'onevalue', 'othervalue'
+
+        monkeypatch.setattr(subprocess, 'Popen', MockPopen)
+        env = 'py%s' % (''.join(sys.version.split('.')[0:2]))
+        config = newconfig("""
+            [testenv:%s]
+            commands = {envsitepackagesdir}
+        """ % (env))
+        conf = config.envconfigs[env]
+        argv = conf.commands
+        assert argv[0][0] == 'onevalue'
+
 
 class TestGlobalOptions:
     def test_notest(self, newconfig):