mbsubmit: add basic tests

* Add basic unit tests for the mbsubmit plugin, covering the output of the
"Print tracks" option on albums and singletons.

test/test_mbsubmit.py

@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+# This file is part of beets.
+# Copyright 2015, Adrian Sampson and Diego Moreda.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+
+from __future__ import (division, absolute_import, print_function,
+                        unicode_literals)
+
+from test._common import unittest
+from test.helper import capture_stdout, control_stdin, TestHelper
+from test.test_importer import ImportHelper, AutotagStub
+from test.test_ui_importer import TerminalImportSessionSetup
+
+
+class MBSubmitPluginTest(TerminalImportSessionSetup, unittest.TestCase,
+                         ImportHelper, TestHelper):
+    def setUp(self):
+        self.setup_beets()
+        self.load_plugins('mbsubmit')
+        self._create_import_dir(2)
+        self._setup_import_session()
+        self.matcher = AutotagStub().install()
+
+    def tearDown(self):
+        self.unload_plugins()
+        self.teardown_beets()
+
+    def test_xxxxprint_tracks_output(self):
+        """Test the output of the "print tracks" choice."""
+        self.matcher.matching = AutotagStub.BAD
+
+        with capture_stdout() as output:
+            with control_stdin('\n'.join(['p', 's'])):
+                # Print tracks; Skip
+                self.importer.run()
+
+        # manually build the string for comparing the output
+        tracklist = ('Print tracks? '
+                     '01. Tag Title 1 - Tag Artist (0:01)\n'
+                     '02. Tag Title 2 - Tag Artist (0:01)')
+        self.assertIn(tracklist, output.getvalue())
+
+    def test_xxprint_tracks_output_as_tracks(self):
+        """Test the output of the "print tracks" choice, as singletons."""
+        self.matcher.matching = AutotagStub.BAD
+
+        with capture_stdout() as output:
+            with control_stdin('\n'.join(['t', 's', 'p', 's'])):
+                # as Tracks; Skip; Print tracks; Skip
+                self.importer.run()
+
+        # manually build the string for comparing the output
+        tracklist = ('Print tracks? '
+                     '02. Tag Title 2 - Tag Artist (0:01)')
+        self.assertIn(tracklist, output.getvalue())
+
+
+def suite():
+    return unittest.TestLoader().loadTestsFromName(__name__)
+
+if __name__ == b'__main__':
+    unittest.main(defaultTest='suite')