Refactored ReSTDirective.handle_signature() and added the first tests for rst domain.

tests/test_rst_domain.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+"""
+    test_rst_domain
+    ~~~~~~~~~~~~~~~
+
+    Tests the reStructuredText domain.
+
+    :copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from sphinx.domains.rst import parse_directive
+
+def test_parse_directive():
+        
+    s = parse_directive(' foö  ')
+    assert s == ('foö', '')
+    
+    s = parse_directive(' ..    foö ::  ')
+    assert s == ('foö', '')
+    
+    s = parse_directive('.. foö:: args1 args2')
+    assert s == ('foö', 'args1 args2')
+    
+    s = parse_directive('.. :: bar')
+    assert s == ('.. :: bar', '')