[WebAgentsAPI]: Introduce OverloadSetAdapter.

third_party/WebKit/Source/bindings/scripts/overload_set_algorithm_test.py

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# pylint: disable=import-error,print-statement,relative-import,protected-access
+
+"""Unit tests for overload_set_algorithm.py."""
+
+import unittest
+
+from overload_set_algorithm import effective_overload_set
+from overload_set_algorithm import MethodContextAdapter
+
+
+class MethodContextAdapterTest(unittest.TestCase):
+    def test_simple(self):
+        adapter = MethodContextAdapter()
+        self.assertEqual(adapter.arguments({'arguments': 'foo'}), 'foo')
+        self.assertEqual(adapter.type({'idl_type_object': 'bar'}), 'bar')
+        self.assertEqual(adapter.is_optional({'is_optional': 'baz'}), 'baz')
+        self.assertEqual(adapter.is_variadic({'is_variadic': 'qux'}), 'qux')
+
+
+class EffectiveOverloadSetTest(unittest.TestCase):
+    def test_example_in_comments(self):
+        operation_list = [
+            {'arguments': [{'idl_type_object': 'long',  # f1(optional long x)
+                            'is_optional': True,
+                            'is_variadic': False}]},
+            {'arguments': [{'idl_type_object': 'DOMString',  # f2(DOMString s)
+                            'is_optional': False,
+                            'is_variadic': False}]},
+        ]
+
+        overload_set = [
+            ({'arguments': [{'idl_type_object': 'long',  # f1(long)
+                             'is_optional': True,
+                             'is_variadic': False}]},
+             ('long',),
+             (True,)),
+            ({'arguments': [{'idl_type_object': 'long',  # f1()
+                             'is_optional': True,
+                             'is_variadic': False}]},
+             (),
+             ()),
+            ({'arguments': [{'idl_type_object': 'DOMString',  # f2(DOMString)
+                             'is_optional': False,
+                             'is_variadic': False}]},
+             ('DOMString',),
+             (False,))]
+
+        self.assertEqual(
+            effective_overload_set(operation_list, MethodContextAdapter()),
+            overload_set)