add a test for sphinxext + autoforwards

sigtools/tests/sphinxextfixt.py

@@ -9,7 +9,7 @@ class AClass(object):
     class_attr = True
     """class attr doc"""
 
-    def __init__(self):
+    def __init__(self): # pragma: no cover
         self.abc = 123
         """instance attr doc"""
 
@@ -26,3 +26,7 @@ def kwo(a, b, c=1, d=2):
 @specifiers.forwards_to(inner)
 def outer(c, *args, **kwargs):
     raise NotImplementedError
+
+
+def autoforwards(d, *args, **kwargs):
+    return inner(*args, **kwargs) # pragma: no cover

sigtools/tests/test_sphinxext.py

@@ -56,6 +56,12 @@ def test_modifiers(self):
             sphinxextfixt.AClass.outer, {}, '(a, b, c=1, d=2)', None)
         self.assertEqual(('(a, b, *, c=1, d=2)', ''), r)
 
+    def test_autoforward(self):
+        r = self.sphinxext.process_signature(
+            app, 'function', 'sigtools.tests.sphinxextfixt.autoforwards',
+            sphinxextfixt.autoforwards, {}, '(d, *args, **kwargs)', None)
+        self.assertEqual(('(d, a, b)', ''), r)
+
     def test_attribute(self):
         r = self.sphinxext.process_signature(
             app, 'attribute', 'sigtools.tests.sphinxextfixt.AClass.class_attr',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=test-{py39,py310}, pyflakes
+envlist=test-{py39,py310},cover-py310-all,pyflakes
 skipsdist=true
 
 [testenv]