Add param splitting test.

test/test_parser/test_param_splitting.py

@@ -0,0 +1,34 @@
+'''
+To make the life of any analysis easier, we are generating Param objects
+instead of simple parser objects.
+'''
+
+from textwrap import dedent
+
+from jedi.parser import Parser, load_grammar
+
+
+def assert_params(param_string, **wanted_dct):
+    source = dedent('''
+    def x(%s):
+        pass
+    ''') % param_string
+
+    parser = Parser(load_grammar(), dedent(source))
+    funcdef = parser.get_parsed_node().subscopes[0]
+    dct = dict((p.name.value, p.default and p.default.get_code())
+               for p in funcdef.params)
+    assert dct == wanted_dct
+    assert parser.get_parsed_node().get_code() == source
+
+
+def test_split_params_with_separation_star():
+    assert_params('x, y=1, *, z=3', x=None, y='1', z='3')
+    assert_params('*, x', x=None)
+    assert_params('*')
+
+
+def test_split_params_with_stars():
+    assert_params('x, *args', x=None, args=None)
+    assert_params('**kwargs', kwargs=None)
+    assert_params('*args, **kwargs', args=None, kwargs=None)