Fix UnicodeDecodeError from #114. Replace definitions of _unicode and

_string. Add six as a dependeny. Fix clonedigger script.

tests/request_test.py

@@ -1,18 +0,0 @@
-# -*- coding: utf-8 -*-
-import mock
-import pytest
-
-import pylast
-
-
-def mock_network():
-    return mock.Mock(
-        _get_ws_auth=mock.Mock(return_value=("", "", ""))
-    )
-
-
-@pytest.mark.parametrize('unicode_artist', [u'\xe9lafdasfdsafdsa', u'ééééééé'])
-def test_get_cache_key(unicode_artist):
-    request = pylast._Request(mock_network(), 'some_method',
-                              params={'artist': unicode_artist})
-    request._get_cache_key()

tests/unicode_test.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+import mock
+import pytest
+import six
+
+import pylast
+
+
+def mock_network():
+    return mock.Mock(
+        _get_ws_auth=mock.Mock(return_value=("", "", ""))
+    )
+
+
+@pytest.mark.parametrize('artist', [
+    u'\xe9lafdasfdsafdsa', u'ééééééé',
+    pylast.Artist(u'B\xe9l', mock_network()),
+    'fdasfdsafsaf not unicode',
+])
+def test_get_cache_key(artist):
+    request = pylast._Request(mock_network(), 'some_method',
+                              params={'artist': artist})
+    request._get_cache_key()
+
+
+@pytest.mark.parametrize('obj', [pylast.Artist(u'B\xe9l', mock_network())])
+def test_cast(obj):
+    assert type(six.text_type(obj)) is six.text_type