Test if virtualenvs and pth files work

test/test_evaluate/sample_venvs/pth_directory/dir-from-foo-pth/__init__.py

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+# This file is here to force git to create the directory, as *.pth files only
+# add existing directories.

test/test_evaluate/sample_venvs/pth_directory/egg_link.egg-link

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+/path/from/egg-link

test/test_evaluate/sample_venvs/pth_directory/foo.pth

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+./dir-from-foo-pth

test/test_evaluate/sample_venvs/pth_directory/import_smth.pth

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+import smth; smth.extend_path_foo()

test/test_evaluate/sample_venvs/pth_directory/relative.egg-link

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+./relative/egg-link/path

test/test_evaluate/sample_venvs/pth_directory/smth.py

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+import sys
+sys.path.append('/foo/smth.py:module')
+
+
+def extend_path_foo():
+    sys.path.append('/foo/smth.py:from_func')