Add any .egg-link paths from VIRTUAL_ENV to sys.path

Adding test_get_sys_path required factoring out
`_get_venv_sitepackages`, because `sys.version_info` cannot be mocked
apparently.

jedi/evaluate/sys_path.py

@@ -1,3 +1,4 @@
+import glob
 import os
 import sys
 
@@ -16,17 +17,26 @@ def get_sys_path():
         if not venv:
             return
         venv = os.path.abspath(venv)
-        if os.name == 'nt':
-            p = os.path.join(venv, 'lib', 'site-packages')
-        else:
-            p = os.path.join(venv, 'lib', 'python%d.%d' % sys.version_info[:2],
-                             'site-packages')
+        p = _get_venv_sitepackages(venv)
         if p not in sys_path:
             sys_path.insert(0, p)
 
+        # Add all egg-links from the virtualenv.
+        for egg_link in glob.glob(os.path.join(p, '*.egg-link')):
+            with open(egg_link) as fd:
+                sys_path.insert(0, fd.readline().rstrip())
+
     check_virtual_env(sys.path)
     return [p for p in sys.path if p != ""]
 
+def _get_venv_sitepackages(venv):
+    if os.name == 'nt':
+        p = os.path.join(venv, 'lib', 'site-packages')
+    else:
+        p = os.path.join(venv, 'lib', 'python%d.%d' % sys.version_info[:2],
+                         'site-packages')
+    return p
+
 
 def _execute_code(module_path, code):
     c = "import os; from os.path import *; result=%s"

pytest.ini

@@ -2,7 +2,7 @@
 addopts = --doctest-modules
 
 # Ignore broken files in blackbox test directories
-norecursedirs = .* docs completion refactor absolute_import namespace_package scripts extensions speed static_analysis not_in_sys_path buildout_project
+norecursedirs = .* docs completion refactor absolute_import namespace_package scripts extensions speed static_analysis not_in_sys_path buildout_project egg-link
 
 # Activate `clean_jedi_cache` fixture for all tests.  This should be
 # fine as long as we are using `clean_jedi_cache` as a session scoped

test/test_evaluate/egg-link/venv/lib/python3.4/site-packages/egg_link.egg-link

@@ -0,0 +1 @@
+/path/from/egg-link

test/test_evaluate/test_sys_path.py

@@ -1,3 +1,5 @@
+import os
+
 from jedi._compatibility import unicode
 from jedi.parser import Parser, load_grammar
 from jedi.evaluate import sys_path, Evaluator
@@ -15,3 +17,15 @@ def test_paths_from_assignment():
 
     # Fail for complicated examples.
     assert paths('sys.path, other = ["a"], 2') == []
+
+
+def test_get_sys_path(monkeypatch):
+    monkeypatch.setenv('VIRTUAL_ENV', os.path.join(os.path.dirname(__file__),
+                                                   'egg-link', 'venv'))
+    def sitepackages_dir(venv):
+        return os.path.join(venv, 'lib', 'python3.4', 'site-packages')
+
+    monkeypatch.setattr('jedi.evaluate.sys_path._get_venv_sitepackages',
+                        sitepackages_dir)
+
+    assert '/path/from/egg-link' in sys_path.get_sys_path()