Test for the autofill login for the form without username field.

chrome/renderer/autofill/password_autofill_agent_browsertest.cc

 // Copyright (c) 2012 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 "components/autofill/content/renderer/password_autofill_agent.h"
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 709 matching lines @@
 // If a username field is empty and readonly, don't autofill.
 TEST_F(PasswordAutofillAgentTest,
        NoAutocompletePasswordForReadonlyUsernameUnmatched) {
   username_element_.SetValue(WebString::FromUTF8(""));
   SetElementReadOnly(username_element_, true);
 
   SimulateOnFillPasswordForm(fill_data_);
   CheckTextFieldsState(std::string(), false, std::string(), false);
 }
 
+// If there is no username field and the saved credentials contain an empty
+// username, then the password is filled.
+TEST_F(PasswordAutofillAgentTest, AutocompletePasswordForNoUsername) {
+  // Load a form with no username and update test data.
+  LoadHTML(kVisibleFormWithNoUsernameHTML);
+  UpdateOnlyPasswordElement();
+  UpdateOriginForHTML(kVisibleFormWithNoUsernameHTML);
+
+  SimulateOnFillPasswordForm(fill_data_);

[vabr (Chromium), 2017/06/19 13:03:36]

Instead of fill_data_, you might need to make a copy and clear its
username_field. Also, password_for_empty_username_ does not seem defined, so
probably just use the password_field.value from the modified FillData.

+  EXPECT_TRUE(password_element_.IsAutofilled());
+  EXPECT_EQ(UTF16ToUTF8(password_for_empty_username_),
+            password_element_.Value().Utf8());
+}
+
 // Tests that having a non-matching username precludes the autocomplete.
 TEST_F(PasswordAutofillAgentTest, NoAutocompleteForFilledFieldUnmatched) {
   username_element_.SetValue(WebString::FromUTF8("bogus"));
 
   // Simulate the browser sending back the login info, it triggers the
   // autocomplete.
   SimulateOnFillPasswordForm(fill_data_);
 
   // Neither field should be autocompleted.
   CheckTextFieldsState("bogus", false, std::string(), false);
@@ skipping 2214 matching lines @@
 TEST_F(PasswordAutofillAgentTest, AutocompleteWhenPageUrlIsChanged) {
   // Simulate that JavaScript changes url.
   fill_data_.origin = GURL(fill_data_.origin.possibly_invalid_spec() + "/path");
 
   SimulateOnFillPasswordForm(fill_data_);
 
   // The username and password should have been autocompleted.
   CheckTextFieldsState(kAliceUsername, true, kAlicePassword, true);
 }
 }  // namespace autofill