tests: address some warnings

- some helper functions were incorrectly detected as being tests due to
  their name
- use of the deprecated assertEquals alias

test/test_importer.py

@@ -1221,7 +1221,7 @@ class InferAlbumDataTest(_common.TestCase):
         self.assertFalse(self.items[0].comp)
 
 
-def test_album_info(*args, **kwargs):
+def match_album_mock(*args, **kwargs):
     """Create an AlbumInfo object for testing.
     """
     track_info = TrackInfo(
@@ -1240,7 +1240,7 @@ def test_album_info(*args, **kwargs):
     return iter([album_info])
 
 
-@patch('beets.autotag.mb.match_album', Mock(side_effect=test_album_info))
+@patch('beets.autotag.mb.match_album', Mock(side_effect=match_album_mock))
 class ImportDuplicateAlbumTest(unittest.TestCase, TestHelper,
                                _common.Assertions):
 
@@ -1349,13 +1349,13 @@ class ImportDuplicateAlbumTest(unittest.TestCase, TestHelper,
         return album
 
 
-def test_track_info(*args, **kwargs):
+def match_track_mock(*args, **kwargs):
     return iter([TrackInfo(
         artist='artist', title='title',
         track_id='new trackid', index=0,)])
 
 
-@patch('beets.autotag.mb.match_track', Mock(side_effect=test_track_info))
+@patch('beets.autotag.mb.match_track', Mock(side_effect=match_track_mock))
 class ImportDuplicateSingletonTest(unittest.TestCase, TestHelper,
                                    _common.Assertions):
 

test/test_m3ufile.py

@@ -77,12 +77,12 @@ class M3UFileTest(unittest.TestCase):
         self.assertTrue(path.exists(the_playlist_file))
         m3ufile_read = M3UFile(the_playlist_file)
         m3ufile_read.load()
-        self.assertEquals(
+        self.assertEqual(
             m3ufile.media_list[0],
             bytestring_path(
                 path.join('x:\\', 'This', 'is', 'å', 'path', 'to_a_file.mp3'))
         )
-        self.assertEquals(
+        self.assertEqual(
             m3ufile.media_list[1],
             bytestring_path(r"x:\This\is\another\path\tö_a_file.mp3"),
             bytestring_path(path.join(