[IMP] test_lint: Add ESLint to the test suite

This commit allows using ESLint on the code JS to disallow undeclared
variables (no-undef) and disallow specific global variables
(no-restricted-globals) (error, event and self).

Co-authored-by: Samuel Degueldre <sad@odoo.com>

odoo/addons/test_lint/tests/__init__.py

@@ -1,6 +1,7 @@
 from . import test_pylint
 from . import test_pofile
 from . import test_ecmascript
+from . import test_eslint
 from . import test_markers
 from . import test_onchange_domains
 from . import test_dunderinit

odoo/addons/test_lint/tests/test_eslint.py

@@ -0,0 +1,59 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import logging
+import re
+import subprocess
+from unittest import skipIf
+from odoo import tools
+
+from . import lint_case
+
+RULES = ('{'
+        '"no-undef": "error",'
+        '"no-restricted-globals": ["error", "event", "self"]'
+        '}'
+)
+PARSER_OPTIONS = '{ecmaVersion: 2019, sourceType: module}'
+GLOBAL = ','.join([
+        'owl',
+        'odoo',
+        '$',
+        'jQuery',
+        '_',
+        'Chart',
+        'fuzzy',
+        'QWeb2',
+        'Popover',
+        'StackTrace',
+        'QUnit',
+        'moment',
+        'py',
+        'ClipboardJS',
+])
+
+_logger = logging.getLogger(__name__)
+
+try:
+    eslint = tools.misc.find_in_path('eslint')
+except IOError:
+    eslint = None
+
+@skipIf(eslint is None, "eslint tool not found on this system")
+class TestESLint(lint_case.LintCase):
+
+    longMessage = True
+
+    def test_eslint_version(self):
+        """ Test that there are no eslint errors in javascript files """
+
+        files_to_check = [
+            p for p in self.iter_module_files('**/static/**/*.js')
+            if not re.match('.*/libs?/.*', p)  # don't check libraries
+        ]
+
+        _logger.info('Testing %s js files', len(files_to_check))
+        # https://eslint.org/docs/user-guide/command-line-interface
+        cmd = [eslint, '--no-eslintrc', '--env', 'browser', '--env', 'es2017', '--parser-options', PARSER_OPTIONS, '--rule', RULES, '--global', GLOBAL] + files_to_check
+        process = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, check=False)
+        self.assertEqual(process.returncode, 0, msg=process.stdout.decode())