tests: specify relative path to README.rst

slapos/recipe/build/tests.py

@@ -139,7 +139,7 @@ class GitCloneNonInformativeTests(unittest.TestCase):
 def test_suite():
   suite = unittest.TestSuite((
       doctest.DocFileSuite(
-          'README.rst',
+          os.path.join(os.path.dirname(__file__), '..', '..', '..', 'README.rst'),
           module_relative=False,
           setUp=setUp,
           tearDown=zc.buildout.testing.buildoutTearDown,