[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/core/common/autofill_util_unittest.cc

+// Copyright 2015 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/core/common/autofill_util.h"
+
+#include "base/command_line.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/autofill/core/common/autofill_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace autofill {
+
+// Tests for ContainsTokenThatStartsWith().
+TEST(AutofillUtilTest, ContainsTokenThatStartsWith) {
+  // ContainsTokenThatStartsWith should not work yet without a flag.
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                           base::ASCIIToUTF16("a"), false));
+
+  // Token matching is currently behind a flag.
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      autofill::switches::kEnableSuggestionsWithSubstringMatch);
+
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),

[please use gerrit instead, 2015/06/29 22:06:29]

Use an array of structs similar to the next test case, please.

[Pritam Nikam, 2015/06/30 15:05:51]

Done.

+                                          base::ASCIIToUTF16("a"), false));
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                          base::ASCIIToUTF16("b"), false));
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                          base::ASCIIToUTF16("Ab"), false));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                           base::ASCIIToUTF16("Ab"), true));
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                          base::ASCIIToUTF16("cd"), true));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                           base::ASCIIToUTF16("d"), false));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                           base::ASCIIToUTF16("b@"), true));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab@cd.b"),
+                                           base::ASCIIToUTF16("cd.b"), false));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::string16(),
+                                           base::ASCIIToUTF16("ab"), false));
+  EXPECT_FALSE(ContainsTokenThatStartsWith(base::string16(),
+                                           base::ASCIIToUTF16("ab"), true));
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab"),
+                                          base::string16(), false));
+  EXPECT_TRUE(ContainsTokenThatStartsWith(base::ASCIIToUTF16("ab"),
+                                          base::string16(), true));
+}
+
+// Tests for GetTextSelectionStart().
+TEST(AutofillUtilTest, GetTextSelectionStart) {
+  const struct {
+    base::string16 field_suggestion;

[please use gerrit instead, 2015/06/29 22:06:29]

Use "char*" instead of "base::string16". Don't base::ASCIIToUTF16() when
building the struct. Do that inside of the loop instead.

[Pritam Nikam, 2015/06/30 15:05:51]

Done.

+    base::string16 field_contents;
+    size_t expected_start;
+  } test_cases[] = {
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("a"), 1},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("Ab"), 2},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd"), 5},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("ab@c"), 4},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("cd.b"), 7},
+      {base::ASCIIToUTF16("ab@cd.b"), base::ASCIIToUTF16("b"), 7},
+      {base::ASCIIToUTF16("ba.a.ab"), base::ASCIIToUTF16("a.a"), 6},
+      {base::ASCIIToUTF16("texample@example.com"),
+       base::ASCIIToUTF16("example"),
+       16}};
+
+  for (size_t i = 0; i < arraysize(test_cases); ++i) {
+    SCOPED_TRACE(testing::Message()
+                 << "suggestion = " << test_cases[i].field_suggestion
+                 << ", contents = " << test_cases[i].field_contents);
+
+    size_t start = GetTextSelectionStart(test_cases[i].field_suggestion,
+                                         test_cases[i].field_contents);
+    EXPECT_EQ(test_cases[i].expected_start, start);
+  }
+}
+
+}  // autofill