Some tests that involved jedi were actually a bit wrong and only worked in certain environments.

conftest.py

@@ -110,3 +110,8 @@ def has_typing(environment):
 
     script = jedi.Script('import typing', environment=environment)
     return bool(script.goto_definitions())
+
+
+@pytest.fixture(scope='session')
+def jedi_path():
+    return os.path.dirname(__file__)

jedi/evaluate/compiled/subprocess/__main__.py

@@ -5,6 +5,9 @@ import os
 _d = os.path.dirname
 _jedi_path = _d(_d(_d(_d(_d(__file__)))))
 _parso_path = sys.argv[1]
+# Remove the first entry, because it's simply a directory entry to this
+# directory.
+del sys.path[0]
 
 # This is kind of stupid. We actually don't want to modify the sys path but
 # simply import something from a specific location.

test/test_api/test_classes.py

@@ -61,7 +61,6 @@ def test_basedefinition_type(Script, environment):
 
         return definitions
 
-
     for definition in make_definitions():
         assert definition.type in ('module', 'class', 'instance', 'function',
                                    'generator', 'statement', 'import', 'param')
@@ -115,16 +114,15 @@ def test_position_none_if_builtin(Script):
     assert gotos[0].column is None
 
 
-@cwd_at('.')
-def test_completion_docstring(Script):
+def test_completion_docstring(Script, jedi_path):
     """
     Jedi should follow imports in certain conditions
     """
     def docstr(src, result):
-        c = Script(src).completions()[0]
+        c = Script(src, sys_path=[jedi_path]).completions()[0]
         assert c.docstring(raw=True, fast=False) == cleandoc(result)
 
-    c = Script('import jedi\njed').completions()[0]
+    c = Script('import jedi\njed', sys_path=[jedi_path]).completions()[0]
     assert c.docstring(fast=False) == cleandoc(jedi_doc)
 
     docstr('import jedi\njedi.Scr', cleandoc(jedi.Script.__doc__))

test/test_api/test_full_name.py

@@ -18,7 +18,7 @@ import textwrap
 import pytest
 
 import jedi
-from ..helpers import TestCase
+from ..helpers import TestCase, cwd_at
 
 
 class MixinTestFullName(object):
@@ -66,9 +66,12 @@ class TestFullDefinedName(TestCase):
     """
     Test combination of ``obj.full_name`` and ``jedi.defined_names``.
     """
+    @pytest.fixture(autouse=True)
+    def init(self, environment):
+        self.environment = environment
 
     def check(self, source, desired):
-        definitions = jedi.names(textwrap.dedent(source))
+        definitions = jedi.names(textwrap.dedent(source), environment=self.environment)
         full_names = [d.full_name for d in definitions]
         self.assertEqual(full_names, desired)
 
@@ -87,14 +90,15 @@ class TestFullDefinedName(TestCase):
         """, ['os', 'os.path', 'os.path.join', 'os.path'])
 
 
-def test_sub_module(Script):
+def test_sub_module(Script, jedi_path):
     """
     ``full_name needs to check sys.path to actually find it's real path module
     path.
     """
-    defs = Script('from jedi.api import classes; classes').goto_definitions()
+    sys_path = [jedi_path]
+    defs = Script('from jedi.api import classes; classes', sys_path=sys_path).goto_definitions()
     assert [d.full_name for d in defs] == ['jedi.api.classes']
-    defs = Script('import jedi.api; jedi.api').goto_definitions()
+    defs = Script('import jedi.api; jedi.api', sys_path=sys_path).goto_definitions()
     assert [d.full_name for d in defs] == ['jedi.api']