Add more tests.

Author: serhiy-storchaka

Lib/test/test_pydoc/test_pydoc.py

@@ -1505,7 +1505,10 @@ def _get_summary_line(o):
         text = pydoc.plain(pydoc.render_doc(o))
         lines = text.split('\n')
         assert len(lines) >= 2
-        return lines[2]
+        for i in range(3, len(lines)):
+            if lines[i].startswith('    '):
+                break
+        return '\n'.join(lines[2:i])
 
     @staticmethod
     def _get_summary_lines(o):
@@ -1650,6 +1653,28 @@ def test_bound_builtin_method_unrepresentable_default(self):
             "meth(a, b=<x>) "
             "method of _testcapi.DocStringUnrepresentableSignatureTest instance")
 
+    @support.cpython_only
+    @requires_docstrings
+    def test_unbound_builtin_method_multisig_unrepresentable_default(self):
+        _testcapi = import_helper.import_module("_testcapi")
+        cls = _testcapi.DocStringUnrepresentableSignatureTest
+        self.assertEqual(self._get_summary_line(cls.meth_multi),
+            "meth_multi(self, /) unbound "
+            "_testcapi.DocStringUnrepresentableSignatureTest method\n"
+            "meth_multi(self, /, a, b=<x>) unbound "
+            "_testcapi.DocStringUnrepresentableSignatureTest method")
+
+    @support.cpython_only
+    @requires_docstrings
+    def test_bound_builtin_method_multisig_unrepresentable_default(self):
+        _testcapi = import_helper.import_module("_testcapi")
+        obj = _testcapi.DocStringUnrepresentableSignatureTest()
+        self.assertEqual(self._get_summary_line(obj.meth_multi),
+            "meth_multi() "
+            "method of _testcapi.DocStringUnrepresentableSignatureTest instance\n"
+            "meth_multi(a, b=<x>) "
+            "method of _testcapi.DocStringUnrepresentableSignatureTest instance")
+
     @support.cpython_only
     @requires_docstrings
     def test_unbound_builtin_classmethod_unrepresentable_default(self):

Modules/_testcapi/docstring.c

@@ -187,7 +187,8 @@ static PyMethodDef DocStringUnrepresentableSignatureTest_methods[] = {
     {"meth_multi",
         (PyCFunction)test_with_docstring, METH_VARARGS,
         PyDoc_STR(
-            "meth_multi($self, /, a, b=<x>)\n"
+            "meth_multi($self, /)\n"
+            "($self, /, a, b=<x>)\n"
             "--\n\n"
             "This docstring has a multisignature with unrepresentable default."
         )},