Tests for limit plugin

test/test_limit.py

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+# This file is part of beets.
+#
+# 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.
+
+"""Tests for the 'limit' plugin."""
+
+import unittest
+
+from test import _common
+from beetsplug import limit
+from beets import config
+
+from test.helper import TestHelper
+
+
+class LsLimitPluginTest(unittest.TestCase, TestHelper):
+
+    def setUp(self):
+        self.setup_beets()
+        self.load_plugins("limit")
+        self.num_test_items = 10
+        assert self.num_test_items % 2 == 0
+        self.num_limit = self.num_test_items / 2
+        self.num_limit_prefix = "'<" + str(self.num_limit) + "'"
+        self.track_head_range = "track:.." + str(self.num_limit)
+        self.track_tail_range = "track:" + str(self.num_limit + 1) + ".."
+        for item_no, item in enumerate(self.add_item_fixtures(count=self.num_test_items)):
+            item.track = item_no + 1
+            item.store()
+
+    def tearDown(self):
+        self.teardown_beets()
+
+    def test_no_limit(self):
+        result = self.run_with_output("lslimit")
+        self.assertEqual(result.count("\n"), self.num_test_items)
+    
+    def test_lslimit_head(self):
+        result = self.run_with_output("lslimit", "--head", str(self.num_limit))
+        self.assertEqual(result.count("\n"), self.num_limit)
+    
+    def test_lslimit_tail(self):
+        result = self.run_with_output("lslimit", "--tail", str(self.num_limit))
+        self.assertEqual(result.count("\n"), self.num_limit)
+    
+    def test_lslimit_head_invariant(self):
+        result = self.run_with_output("lslimit", "--head", str(self.num_limit), self.track_tail_range)
+        self.assertEqual(result.count("\n"), self.num_limit)
+    
+    def test_lslimit_tail_invariant(self):
+        result = self.run_with_output("lslimit", "--tail", str(self.num_limit), self.track_head_range)
+        self.assertEqual(result.count("\n"), self.num_limit)
+
+    def test_prefix(self):
+        result = self.run_with_output("ls", self.num_limit_prefix)
+        self.assertEqual(result.count("\n"), self.num_limit)
+
+    def test_prefix_when_correctly_ordered(self):
+        result = self.run_with_output("ls", self.track_tail_range, self.num_limit_prefix)
+        self.assertEqual(result.count("\n"), self.num_limit)
+
+    def test_prefix_when_incorrectly_ordred(self):
+        result = self.run_with_output("ls", self.num_limit_prefix, self.track_tail_range)
+        self.assertEqual(result.count("\n"), 0)
+
+
+def suite():
+    return unittest.TestLoader().loadTestsFromName(__name__)
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='suite')