AutoFillProfile: Don't clobber data on self-assignment

chrome/browser/autofill/autofill_profile_unittest.cc

 // Copyright (c) 2010 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 "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autofill/autofill_common_test.h"
@@ skipping 477 matching lines @@
 
   AutoFillProfile expected_a;
   autofill_test::SetProfileInfo(&expected_a, "label1", "Jimmy", NULL, "Madison",
       "constitutionalist@gmail.com", "United States Government", "Monticello",
       NULL, "Charlottesville", "Virginia", "22902", NULL, "12134759123",
       "19384284720");
   EXPECT_EQ(0, expected_a.Compare(*a));
   EXPECT_EQ(0, expected_b.Compare(*b));
 }
 
+TEST(AutoFillProfileTest, AssignmentOperator){
+  AutoFillProfile a, b;
+
+  // Result of assignment should be logically equal to the original profile.
+  autofill_test::SetProfileInfo(&a, "Billing", "Marion", "Mitchell", "Morrison",
+                                "marion@me.xyz", "Fox", "123 Zoo St.", "unit 5",
+                                "Hollywood", "CA", "91601", "US", "12345678910",
+                                "01987654321");
+  b = a;
+  EXPECT_TRUE(a == b);
+
+  // Assignment to self should not change the profile value.
+  a = a;
+  EXPECT_TRUE(a == b);
+}
+
 TEST(AutoFillProfileTest, Compare) {
   AutoFillProfile a, b;
 
   // Empty profiles are the same.
   EXPECT_EQ(0, a.Compare(b));
 
   // GUIDs don't count.
   a.set_guid(guid::GenerateGUID());
   b.set_guid(guid::GenerateGUID());
   EXPECT_EQ(0, a.Compare(b));
 
   // Different values produce non-zero results.
   autofill_test::SetProfileInfo(&a, "label1", "Jimmy", NULL, NULL, NULL,
       NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
   autofill_test::SetProfileInfo(&b, "label1", "Ringo", NULL, NULL, NULL,
       NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
   EXPECT_GT(0, a.Compare(b));
   EXPECT_LT(0, b.Compare(a));
 }
 
 }  // namespace