extended test case

tests/run/argerrors.py

 # mode: run
+# tags: kwargs, argument unpacking
+
+# This test validates the error handling in the different specialised
+# code paths of the argument unpacking code.  The have-kwargs and
+# no-kwargs branches take different paths, so we always test with and
+# without a keyword dict (even if it's empty).
 
 def test_single_arg(a):
     """
     >>> test_single_arg(1)
     1
-    >>> test_single_arg()                # doctest: +ELLIPSIS
+    >>> test_single_arg(1, **{})
+    1
+    >>> test_single_arg()                  # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_single_arg(1,2)             # doctest: +ELLIPSIS
+    >>> test_single_arg(1,2)               # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_single_arg(**{})            # doctest: +ELLIPSIS
+    >>> test_single_arg(1,2, **{})         # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_single_arg(*(), **{})       # doctest: +ELLIPSIS
+    >>> test_single_arg(**{})              # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_single_arg(*(), **{})         # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_single_arg(**{'b':2})         # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_single_arg(**{'a':1, 'b':2})  # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
     """
@@ -23,22 +40,37 @@ def test_two_args(a,b):
     """
     >>> test_two_args(1,2)
     (1, 2)
-    >>> test_two_args()              # doctest: +ELLIPSIS
+    >>> test_two_args(1,2, **{})
+    (1, 2)
+    >>> test_two_args(1,**{'b':2})
+    (1, 2)
+    >>> test_two_args(**{'a':1, 'b':2})
+    (1, 2)
+    >>> test_two_args()                 # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_two_args(1)                # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_two_args(1, **{})          # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: ...
+    >>> test_two_args(1,2,3)            # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_two_args(1)             # doctest: +ELLIPSIS
+    >>> test_two_args(1,2,3, **{})      # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_two_args(1,2,3)         # doctest: +ELLIPSIS
+    >>> test_two_args(**{})             # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_two_args(**{})          # doctest: +ELLIPSIS
+    >>> test_two_args(*(), **{})        # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_two_args(1, **{})       # doctest: +ELLIPSIS
+    >>> test_two_args(**{'a':1})        # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
-    >>> test_two_args(*(), **{})     # doctest: +ELLIPSIS
+    >>> test_two_args(**{'a':1, 'b':2, 'c':3})  # doctest: +ELLIPSIS
     Traceback (most recent call last):
     TypeError: ...
     """