[pygobject] tests: support builddir != srcdir

[Christoph Reiter <creiter src gnome org>]

commit a1bb7bfb03ef713066753ed0679096db8d94e0bc
Author: Mathieu Duponchelle <mathieu centricular com>
Date:   Fri Mar 16 00:41:21 2018 +0100

    tests: support builddir != srcdir

 tests/__init__.py          | 22 ++++++++++++++++++++++
 tests/test_gobject.py      |  2 +-
 tests/test_interface.py    |  2 +-
 tests/test_internal_api.py |  2 +-
 tests/test_signal.py       |  2 +-
 tests/test_thread.py       |  2 +-
 tests/test_unknown.py      |  2 +-
 7 files changed, 28 insertions(+), 6 deletions(-)
---
diff --git a/tests/__init__.py b/tests/__init__.py
index 09a20e37..437c44e7 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -7,6 +7,27 @@ import signal
 import subprocess
 import atexit
 import warnings
+import importlib
+import sys
+import imp
+
+
+class GIImport:
+    def find_module(self, fullname, path=None):
+        if fullname == 'gi._gi':
+            return self
+        return None
+
+    def load_module(self, name):
+        if name in sys.modules:
+            return sys.modules[name]
+        module_info = imp.find_module('_gi')
+        module = imp.load_module(name, *module_info)
+        sys.modules[name] = module
+        return module
+
+
+sys.meta_path.insert(0, GIImport())
 
 
 def init_test_environ():
@@ -46,6 +67,7 @@ def init_test_environ():
     tests_srcdir = os.path.abspath(os.path.dirname(__file__))
     srcdir = os.path.dirname(tests_srcdir)
 
+    sys.path.insert(0, os.path.join(builddir, 'gi'))
     sys.path.insert(0, tests_srcdir)
     sys.path.insert(0, srcdir)
     sys.path.insert(0, tests_builddir)
diff --git a/tests/test_gobject.py b/tests/test_gobject.py
index 3f7e0089..36a6af18 100644
--- a/tests/test_gobject.py
+++ b/tests/test_gobject.py
@@ -12,7 +12,7 @@ from gi import PyGIDeprecationWarning
 from gi.module import get_introspection_module
 from gi import _gi
 
-from . import testhelper
+import testhelper
 
 
 class TestGObjectAPI(unittest.TestCase):
diff --git a/tests/test_interface.py b/tests/test_interface.py
index bed37f36..ca1e0f47 100644
--- a/tests/test_interface.py
+++ b/tests/test_interface.py
@@ -5,7 +5,7 @@ from __future__ import absolute_import
 import unittest
 
 from gi.repository import GObject
-from . import testhelper
+import testhelper
 
 
 GUnknown = GObject.type_from_name("TestUnknown")
diff --git a/tests/test_internal_api.py b/tests/test_internal_api.py
index 7b2b8ea5..9dcde058 100644
--- a/tests/test_internal_api.py
+++ b/tests/test_internal_api.py
@@ -9,7 +9,7 @@ import pytest
 from gi.repository import GLib, GObject
 from gi._compat import PY3
 
-from . import testhelper
+import testhelper
 
 
 class PyGObject(GObject.GObject):
diff --git a/tests/test_signal.py b/tests/test_signal.py
index f4641a81..16d95c27 100644
--- a/tests/test_signal.py
+++ b/tests/test_signal.py
@@ -14,7 +14,7 @@ from gi import _signalhelper as signalhelper
 from gi.module import repository as repo
 from gi._compat import PY3, long_
 
-from . import testhelper
+import testhelper
 from .helper import capture_glib_warnings, capture_gi_deprecation_warnings
 
 
diff --git a/tests/test_thread.py b/tests/test_thread.py
index e2bbda08..45ebd0b5 100644
--- a/tests/test_thread.py
+++ b/tests/test_thread.py
@@ -6,7 +6,7 @@ import unittest
 
 from gi.repository import GLib
 
-from . import testhelper
+import testhelper
 
 
 class TestThread(unittest.TestCase):
diff --git a/tests/test_unknown.py b/tests/test_unknown.py
index e483003d..1ed1fb88 100644
--- a/tests/test_unknown.py
+++ b/tests/test_unknown.py
@@ -6,7 +6,7 @@ import unittest
 
 from gi.repository import GObject
 
-from . import testhelper
+import testhelper
 
 
 TestInterface = GObject.GType.from_name('TestInterface')