Issue 7192 - Remove unused qunit/common.js file from webpack bundle

tests/test_packagerWebExt.py

 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import difflib
 import json
 import os
 import re
 import shutil
 import zipfile
@@ skipping 217 matching lines @@
 @pytest.fixture
 def lib_files(tmpdir):
     files = packager.Files(['lib'], set())
     files['ext/a.js'] = 'require("./c.js");\nrequire("info");\nvar bar;'
     files['lib/b.js'] = 'var foo;'
     files['lib/aliased.js'] = 'require("mogo");'
     files['lib/mogo.js'] = 'var this_is_mogo;'
     files['lib/edge.js'] = 'var this_is_edge;'
     files['ext/c.js'] = 'var this_is_c;'
     files['ext/alias_c.js'] = 'var this_is_aliased_c;'
-    files['qunit/common.js'] = 'var qunit = {};'
     files['qunit/tests/some_test.js'] = 'var passed = true;'
 
     libdir = tmpdir.mkdir('lib')
     libdir.join('b.js').write(files['lib/b.js'])
     libdir.join('aliased.js').write(files['lib/aliased.js'])
     libdir.join('mogo.js').write(files['lib/mogo.js'])
     libdir.join('edge.js').write(files['lib/edge.js'])
     ext_dir = tmpdir.mkdir('ext')
     ext_dir.join('a.js').write(files['ext/a.js'])
     ext_dir.join('c.js').write(files['ext/c.js'])
     qunit_dir = tmpdir.mkdir('qunit')
-    qunit_dir.join('common.js').write(files['qunit/common.js'])
     qunit_tests_dir = qunit_dir.mkdir('tests')
     qunit_tests_dir.join('some_test.js').write(
         files['qunit/tests/some_test.js'],
     )
     return files
 
 
 def comparable_json(json_data):
     """Create a nonambiguous representation of the given JSON data."""
     if isinstance(json_data, basestring):
@@ skipping 234 matching lines @@
             expected = os.path.join(
                 os.path.dirname(__file__),
                 'expecteddata',
                 filename.format(name, ext),
             )
 
             assert_manifest_content(
                 package.read(os.path.join(folder, '{}.{}'.format(name, ext))),
                 expected,
             )