Add PrefStore::GetValues

components/prefs/overlay_user_pref_store_unittest.cc

Index: components/prefs/overlay_user_pref_store_unittest.cc
diff --git a/components/prefs/overlay_user_pref_store_unittest.cc b/components/prefs/overlay_user_pref_store_unittest.cc
index d722aeab6e01002dd4276c81c96c0db751a833c5..20cdb1730fb3fdd74143d4442f54bdb75ef09577 100644
--- a/components/prefs/overlay_user_pref_store_unittest.cc
+++ b/components/prefs/overlay_user_pref_store_unittest.cc
@@ -19,9 +19,11 @@ namespace {
 
 const char kBrowserWindowPlacement[] = "browser.window_placement";
 const char kShowBookmarkBar[] = "bookmark_bar.show_on_all_tabs";
+const char kSharedKey[] = "sync_promo.show_on_first_run_allowed";
 
 const char* const overlay_key = kBrowserWindowPlacement;
 const char* const regular_key = kShowBookmarkBar;
+const char* const shared_key = kSharedKey;
 // With the removal of the kWebKitGlobalXXX prefs, we'll no longer have real
 // prefs using the overlay pref store, so make up keys here.
 const char mapped_overlay_key[] = "test.per_tab.javascript_enabled";
@@ -35,6 +37,7 @@ class OverlayUserPrefStoreTest : public testing::Test {
       : underlay_(new TestingPrefStore()),
         overlay_(new OverlayUserPrefStore(underlay_.get())) {
     overlay_->RegisterOverlayPref(overlay_key);
+    overlay_->RegisterOverlayPref(shared_key);
     overlay_->RegisterOverlayPref(mapped_overlay_key, mapped_underlay_key);
   }
 
@@ -309,4 +312,42 @@ TEST_F(OverlayUserPrefStoreTest, ClearMutableValues) {
   EXPECT_TRUE(base::FundamentalValue(42).Equals(value));
 }
 
+TEST_F(OverlayUserPrefStoreTest, GetValues) {
+  // To check merge behavior, create underlay and overlay so each has a key the
+  // other doesn't have and they have one key in common.
+  underlay_->SetValue(regular_key, base::WrapUnique(new FundamentalValue(42)),
+                      WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+  overlay_->SetValue(overlay_key, base::WrapUnique(new FundamentalValue(43)),
+                     WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+  underlay_->SetValue(shared_key, base::WrapUnique(new FundamentalValue(42)),
+                      WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+  overlay_->SetValue(shared_key, base::WrapUnique(new FundamentalValue(43)),
+                     WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+  underlay_->SetValue(mapped_underlay_key,
+                      base::WrapUnique(new FundamentalValue(42)),
+                      WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+  overlay_->SetValue(mapped_overlay_key,
+                     base::WrapUnique(new FundamentalValue(43)),
+                     WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+
+  auto values = overlay_->GetValues();
+  const Value* value = nullptr;
+  // Check that an overlay preference is returned.
+  ASSERT_TRUE(values->Get(overlay_key, &value));
+  EXPECT_TRUE(base::FundamentalValue(43).Equals(value));
+
+  // Check that an underlay preference is returned.
+  ASSERT_TRUE(values->Get(regular_key, &value));
+  EXPECT_TRUE(base::FundamentalValue(42).Equals(value));
+
+  // Check that the overlay is preferred.
+  ASSERT_TRUE(values->Get(shared_key, &value));
+  EXPECT_TRUE(base::FundamentalValue(43).Equals(value));
+
+  // Check that mapping works.
+  ASSERT_TRUE(values->Get(mapped_overlay_key, &value));
+  EXPECT_TRUE(base::FundamentalValue(43).Equals(value));
+  EXPECT_FALSE(values->Get(mapped_underlay_key, &value));
+}
+
 }  // namespace base