Rewrite Clipboard class using pyperclip + add tests

See issue t4ngo#15.
- This makes the clipboard functionality work on other platforms.
- The only supported Windows clipboard format is Unicode text.
- The class should be backwards-compatibile assuming Unicode text
  is the only clipboard format used.

dragonfly/os_dependent_mock.py

@@ -61,10 +61,6 @@ def __init__(self, *args, **kwargs):
         pass
 
 
-class Clipboard(MockBase):
-    pass
-
-
 class HardwareInput(MockBase):
     pass
 

dragonfly/test/test_clipboard.py

@@ -0,0 +1,96 @@
+#
+# This file is part of Dragonfly.
+# (c) Copyright 2007, 2008 by Christo Butcher
+# Licensed under the LGPL.
+#
+#   Dragonfly is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU Lesser General Public License as published
+#   by the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   Dragonfly is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#   Lesser General Public License for more details.
+#
+#   You should have received a copy of the GNU Lesser General Public
+#   License along with Dragonfly.  If not, see
+#   <http://www.gnu.org/licenses/>.
+#
+
+import unittest
+
+from dragonfly import Clipboard
+
+
+class TestClipboard(unittest.TestCase):
+    def setUp(self):
+        # Clear the clipboard before each test.
+        Clipboard.clear_clipboard()
+
+    def test_system_text_methods(self):
+        text = "testing testing"
+        Clipboard.set_system_text(text)
+        self.assertEqual(Clipboard.get_system_text(), text)
+
+    def test_clear_clipboard(self):
+        # Put something on the system clipboard.
+        Clipboard.set_system_text("something")
+
+        # Clear it.
+        Clipboard.clear_clipboard()
+
+        # Then test that it has been cleared.
+        self.assertEqual(Clipboard.get_system_text(), "")
+
+    def test_empty(self):
+        # A new clipboard has no content for the unicode format.
+        c = Clipboard()
+        self.assertFalse(c.has_format(Clipboard.format_unicode))
+
+        # Neither does a new clipboard have text.
+        self.assertFalse(c.has_text())
+
+    def test_from_system_argument(self):
+        # Test the optional from_system argument of Clipboard.__init__
+        text = "something"
+        Clipboard.set_system_text(text)
+        c = Clipboard(from_system=True)
+        self.assertEqual(c.text, text)
+        self.assertTrue(c.has_format(Clipboard.format_unicode))
+        self.assertTrue(c.has_text())
+
+    def test_copy_from_system(self):
+        text = "testing"
+        Clipboard.set_system_text(text)
+        c = Clipboard()
+
+        # Test the method with clear=False (default)
+        c.copy_from_system(clear=False)
+        self.assertEqual(c.text, text)
+        self.assertEqual(Clipboard.get_system_text(), text)
+
+        # Test again with clear=True
+        c = Clipboard()
+        c.copy_from_system(clear=True)
+        self.assertEqual(c.text, text)
+        self.assertEqual(Clipboard.get_system_text(), "")
+
+    def test_copy_to_system(self):
+        text = "testing"
+        c = Clipboard(text=text)
+        c.copy_to_system()
+        self.assertEqual(Clipboard.get_system_text(), text)
+
+    def test_set_text(self):
+        c = Clipboard()
+        text = "test"
+        c.set_text(text)
+        self.assertTrue(c.has_text())
+        self.assertTrue(c.has_format(Clipboard.format_unicode))
+        self.assertEqual(c.get_text(), text)
+        self.assertEqual(c.text, text)
+
+
+if __name__ == '__main__':
+    unittest.main()

dragonfly/windows/__init__.py

@@ -23,13 +23,12 @@
 # OS agnostic imports
 from rectangle import Rectangle, unit
 from point     import Point
+from .clipboard import Clipboard
 
 # Windows-specific
 if sys.platform.startswith("win"):
     from window    import Window
     from monitor   import Monitor, monitors
-    from clipboard import Clipboard
 else:  # Mock imports
     from ..os_dependent_mock      import Window
     from ..os_dependent_mock      import Monitor, monitors
-    from ..os_dependent_mock      import Clipboard