Move the extension test to examples

pytest.ini

@@ -4,7 +4,7 @@ addopts = --doctest-modules
 # Ignore broken files in blackbox test directories
 norecursedirs = .* docs completion refactor namespace_package
     scripts extensions speed static_analysis not_in_sys_path
-    sample_venvs init_extension_module jedi/third_party
+    sample_venvs jedi/third_party
 
 # 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_inference/test_extension.py

@@ -35,7 +35,7 @@ def test_find_signatures_stdlib(Script):
 
 # Check only on linux 64 bit platform and Python3.4.
 @pytest.mark.skipif('sys.platform != "linux" or sys.maxsize <= 2**32 or sys.version_info[:2] != (3, 4)')
-@cwd_at('test/test_inference')
+@cwd_at('test/examples')
 def test_init_extension_module(Script):
     """
     ``__init__`` extension modules are also packages and Jedi should understand