Add tests

tests/roots/test-domain-py/module.rst

@@ -36,3 +36,5 @@ module
    :type  x: int
    :param y: param y
    :type  y: tuple(str, float)
+   :rtype:   list
+

tests/test_domain_py.py

@@ -113,7 +113,8 @@ def test_domain_py_xrefs(app, status, warning):
     assert_refnode(refnodes[8], False, False, 'tuple', 'class')
     assert_refnode(refnodes[9], False, False, 'str', 'class')
     assert_refnode(refnodes[10], False, False, 'float', 'class')
-    assert len(refnodes) == 11
+    assert_refnode(refnodes[11], False, False, 'list', 'class')
+    assert len(refnodes) == 12
 
 
 @pytest.mark.sphinx('dummy', testroot='domain-py')