Add "previewing on hover" support for single-field autocomplete input

components/autofill/core/browser/autofill_external_delegate_unittest.cc

 // Copyright 2013 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.
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 357 matching lines @@
   // Ensure selecting a new password entries or Autofill entries will
   // cause any previews to get cleared.
   EXPECT_CALL(*autofill_driver_, RendererShouldClearPreviewedForm()).Times(1);
   external_delegate_->DidSelectSuggestion(
       WebAutofillClient::MenuItemIDPasswordEntry);
 
   EXPECT_CALL(*autofill_driver_, RendererShouldClearPreviewedForm()).Times(1);
   EXPECT_CALL(*autofill_driver_, SetRendererActionOnFormDataReception(
       AutofillDriver::FORM_DATA_ACTION_PREVIEW));
   external_delegate_->DidSelectSuggestion(1);
+
+  // Ensure selecting an AutoComplete entries will cause any previews to
+  // get cleared.
+  base::string16 suggestion_string(ASCIIToUTF16("baz foo"));
+  EXPECT_CALL(*autofill_driver_, RendererShouldClearPreviewedForm()).Times(1);
+  external_delegate_->DidSelectAutocompleteSuggestion(suggestion_string);
+}
+
+// Test that the ClearAutoCompletePreview call is only sent if the autocomplete
+// field was being previewed.
+TEST_F(AutofillExternalDelegateUnitTest,
+       ExternalDelegateClearAutocompletePreviewedField) {
+  base::string16 suggestion_string(ASCIIToUTF16("baz foo"));
+  EXPECT_CALL(*autofill_driver_,
+              RendererShouldSetNodeText(suggestion_string));
+
+  EXPECT_CALL(*autofill_driver_, RendererShouldClearPreviewedForm()).Times(1);
+  EXPECT_CALL(*autofill_driver_,
+              RendererShouldSetNodeText(ASCIIToUTF16("")));
+  external_delegate_->DidSelectAutocompleteSuggestion(suggestion_string);
 }
 
 // Test that the popup is hidden once we are done editing the autofill field.
 TEST_F(AutofillExternalDelegateUnitTest,
        ExternalDelegateHidePopupAfterEditing) {
   EXPECT_CALL(manager_delegate_, ShowAutofillPopup(_, _, _, _, _, _, _));
   autofill::GenerateTestAutofillPopup(external_delegate_.get());
 
   EXPECT_CALL(manager_delegate_, HideAutofillPopup());
   external_delegate_->DidEndTextFieldEditing();
@@ skipping 96 matching lines @@
   EXPECT_CALL(manager_delegate_, HideAutofillPopup());
   base::string16 dummy_string(ASCIIToUTF16("baz foo"));
   EXPECT_CALL(*autofill_driver_,
               RendererShouldSetNodeText(dummy_string));
   external_delegate_->DidAcceptSuggestion(
       dummy_string,
       WebAutofillClient::MenuItemIDAutocompleteEntry);
 }
 
 }  // namespace autofill