[FIX] tests: add a linter to check for __init__.py in modules

When a module is added, it happens that the `__init__.py` file is
forgotten. In that case, those modules are not packaged.

With this commit, a test is added to check that each Odoo module has the
file.

X-original-commit: edabed7b

odoo/addons/test_lint/tests/__init__.py

@@ -3,3 +3,4 @@ from . import test_pofile
 from . import test_ecmascript
 from . import test_markers
 from . import test_onchange_domains
+from . import test_dunderinit

odoo/addons/test_lint/tests/test_dunderinit.py

+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import logging
+from pathlib import Path
+
+from odoo.modules import get_modules, get_module_path
+from . import lint_case
+
+_logger = logging.getLogger(__name__)
+
+
+class TestDunderinit(lint_case.LintCase):
+
+    def test_dunderinit(self):
+        """ Test that __init__.py exists in Odoo modules, otherwise they won't get packaged"""
+
+        modules_list = get_modules()
+        for mod in modules_list:
+            dunderinit_path = Path(get_module_path(mod)) / '__init__.py'
+            self.assertTrue(dunderinit_path.is_file(), "Missing `__init__.py ` in module %s" % mod)
+
+        _logger.info('%s modules checked', len(modules_list))