Fix sys.path.insert for project path: insert absolute path (#638)

Fixes #637

pytest_django/plugin.py

@@ -139,7 +139,7 @@ def find_django_path(args):
 
     project_dir = find_django_path(args)
     if project_dir:
-        sys.path.insert(0, str(project_dir))
+        sys.path.insert(0, str(project_dir.absolute()))
         return PROJECT_FOUND % project_dir
     return PROJECT_NOT_FOUND
 

tests/test_manage_py_scan.py

@@ -23,6 +23,24 @@ def test_foobar():
     assert outcomes['passed'] == 1
 
 
+@pytest.mark.django_project(project_root='django_project_root',
+                            create_manage_py=True)
+def test_django_project_found_absolute(django_testdir, monkeypatch):
+    """This only tests that "." is added as an absolute path (#637)."""
+    django_testdir.create_test_module("""
+    def test_dot_not_in_syspath():
+        import sys
+        assert '.' not in sys.path[:5]
+    """)
+    monkeypatch.chdir('django_project_root')
+    # NOTE: the "." here is important to test for an absolute path being used.
+    result = django_testdir.runpytest_subprocess('-s', '.')
+    assert result.ret == 0
+
+    outcomes = result.parseoutcomes()
+    assert outcomes['passed'] == 1
+
+
 @pytest.mark.django_project(project_root='django_project_root',
                             create_manage_py=True)
 def test_django_project_found_invalid_settings(django_testdir, monkeypatch):