[Autofill] Add a unit test for the autofill_regexes code.

chrome/browser/autofill/autofill_regexes_unittest.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 "chrome/browser/autofill/autofill_regexes.h"
+
+#include "base/string16.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/autofill/autofill_regex_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(AutofillRegexesTest, AutofillRegexes) {
+  struct TestCase {
+    const char* const input;
+    const char* const pattern;
+  };
+
+  const TestCase kPositiveCases[] = {
+    // Empty pattern
+    {"", ""},
+    {"Look, ma' -- a non-empty string!", ""},
+    // Substring
+    {"string", "tri"},
+    // Substring at beginning
+    {"string", "str"},
+    {"string", "^str"},
+    // Substring at end
+    {"string", "ring"},
+    {"string", "ring$"},
+    // Case-insensitive
+    {"StRiNg", "string"},
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kPositiveCases); ++i) {
+    const TestCase& test_case = kPositiveCases[i];
+    SCOPED_TRACE(test_case.input);
+    SCOPED_TRACE(test_case.pattern);
+    EXPECT_TRUE(autofill::MatchesPattern(ASCIIToUTF16(test_case.input),
+                                         ASCIIToUTF16(test_case.pattern)));
+  }
+
+  const TestCase kNegativeCases[] = {
+    // Empty string
+    {"", "Look, ma' -- a non-empty pattern!"},
+    // Substring
+    {"string", "trn"},
+    // Substring at beginning
+    {"string", " str"},
+    {"string", "^tri"},
+    // Substring at end
+    {"string", "ring "},
+    {"string", "rin$"},
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kNegativeCases); ++i) {
+    const TestCase& test_case = kNegativeCases[i];
+    SCOPED_TRACE(test_case.input);
+    SCOPED_TRACE(test_case.pattern);
+    EXPECT_FALSE(autofill::MatchesPattern(ASCIIToUTF16(test_case.input),
+                                          ASCIIToUTF16(test_case.pattern)));
+  }
+}