[Extensions Bindings] Check availability of custom API properties

extensions/common/features/feature_provider_unittest.cc

Index: extensions/common/features/feature_provider_unittest.cc
diff --git a/extensions/common/features/feature_provider_unittest.cc b/extensions/common/features/feature_provider_unittest.cc
index 2bf161f4291e12c720f1823f736a4c9043d41aff..26d641959ca0dc0cc3c73dceb2ae81faf11d7a3d 100644
--- a/extensions/common/features/feature_provider_unittest.cc
+++ b/extensions/common/features/feature_provider_unittest.cc
@@ -180,4 +180,41 @@ TEST(FeatureProviderTest, GetChildren) {
                                   "parent.other_child.other_grandchild"));
 }
 
+TEST(FeatureProviderTest, GetParent) {
+  FeatureProvider provider;
+
+  auto add_feature = [&provider](base::StringPiece name,
+                                 bool no_parent = false) {
+    auto feature = base::MakeUnique<SimpleFeature>();
+    feature->set_name(name);
+    feature->set_noparent(no_parent);
+    provider.AddFeature(name, std::move(feature));
+  };
+
+  add_feature("parent");
+  add_feature("parent.child");
+  add_feature("parent.child.grandchild");
+  add_feature("parent.other_child.other_grandchild");
+  add_feature("parent.unparented_child", true);
+
+  auto is_parent = [&provider](base::StringPiece child_name,
+                               base::StringPiece parent_name) {
+    Feature* child = provider.GetFeature(child_name.as_string());
+    ASSERT_TRUE(child) << child_name;
+    Feature* parent = provider.GetParent(child);
+    ASSERT_TRUE(parent) << parent_name;
+    EXPECT_EQ(parent_name.as_string(), parent->name());
+  };
+
+  is_parent("parent.child", "parent");
+  is_parent("parent.child.grandchild", "parent.child");
+  is_parent("parent.other_child.other_grandchild", "parent");
+
+  {
+    Feature* no_parent = provider.GetFeature("parent.unparented_child");
+    ASSERT_TRUE(no_parent);
+    EXPECT_TRUE(no_parent->no_parent());
+  }
+}
+
 }  // namespace extensions