use the mobile_cv's SubPackageInitFileTestMixin

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/263

Re-use the code in D36651241

Reviewed By: tglik

Differential Revision: D36682041

fbshipit-source-id: 1bf30afbbb69d10fc11f9161e29319f180c65e2f

tests/misc/test_sub_package_init_file.py

 #!/usr/bin/env python3
 # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
 
-import glob
-import os
 import unittest
 
-import pkg_resources
+from mobile_cv.common.misc.test_utils import SubPackageInitFileTestMixin
 
 
-class TestSubPackageInitFile(unittest.TestCase):
-    def test_has_init_files(self):
-        """We require every subpackage has an __init__.py file"""
-        root = pkg_resources.resource_filename("d2go", "")
-
-        all_py_files = glob.glob(f"{root}/**/*.py", recursive=True)
-        all_package_dirs = [os.path.dirname(f) for f in all_py_files]
-        all_package_dirs = sorted(set(all_package_dirs))  # dedup
-
-        init_files = [
-            os.path.join(os.path.relpath(d, root), "__init__.py")
-            for d in all_package_dirs
-        ]
-        print("Checking following files ...\n{}".format("\n".join(init_files)))
-        missing_init_files = [
-            f for f in init_files if not os.path.isfile(os.path.join(root, f))
-        ]
-        self.assertTrue(
-            len(missing_init_files) == 0,
-            "Missing following __init__.py files:\n{}".format(
-                "\n".join(missing_init_files)
-            ),
-        )
+class TestSubPackageInitFile(SubPackageInitFileTestMixin, unittest.TestCase):
+    def get_pacakge_name(self) -> str:
+        return "d2go"