Move Courgette...

courgette/difference_estimator_unittest.cc

+// Copyright (c) 2009 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 "courgette/difference_estimator.h"
+
+#include <string>
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "courgette/region.h"
+
+using courgette::DifferenceEstimator;
+using courgette::Region;
+
+TEST(DifferenceEstimatorTest, TestSame) {
+  static const char kString1[] = "Hello world";
+  // kString2 is stack allocated to prevent string sharing.
+  const char kString2[] = "Hello world";
+  DifferenceEstimator difference_estimator;
+  DifferenceEstimator::Base* base =
+      difference_estimator.MakeBase(Region(kString1, sizeof(kString1)));
+  DifferenceEstimator::Subject* subject =
+      difference_estimator.MakeSubject(Region(kString2, sizeof(kString2)));
+  EXPECT_EQ(0, difference_estimator.Measure(base, subject));
+}
+
+TEST(DifferenceEstimatorTest, TestDifferent) {
+  static const char kString1[] = "Hello world";
+  static const char kString2[] = "Hello universe";
+  DifferenceEstimator difference_estimator;
+  DifferenceEstimator::Base* base =
+      difference_estimator.MakeBase(Region(kString1, sizeof(kString1)));
+  DifferenceEstimator::Subject* subject =
+      difference_estimator.MakeSubject(Region(kString2, sizeof(kString2)));
+  EXPECT_EQ(10, difference_estimator.Measure(base, subject));
+}
+
+TEST(DifferenceEstimatorTest, TestDifferentSuperstring) {
+  static const char kString1[] = "abcdabcdabcd";
+  static const char kString2[] = "abcdabcdabcdabcd";
+  DifferenceEstimator difference_estimator;
+  DifferenceEstimator::Base* base =
+      difference_estimator.MakeBase(Region(kString1, sizeof(kString1)-1));
+  DifferenceEstimator::Subject* subject =
+      difference_estimator.MakeSubject(Region(kString2, sizeof(kString2)-1));
+  EXPECT_EQ(1, difference_estimator.Measure(base, subject));
+}
+
+TEST(DifferenceEstimatorTest, TestDifferentSubstring) {
+  static const char kString1[] = "abcdabcdabcdabcd";
+  static const char kString2[] = "abcdabcdabcd";
+  DifferenceEstimator difference_estimator;
+  DifferenceEstimator::Base* base =
+      difference_estimator.MakeBase(Region(kString1, sizeof(kString1)-1));
+  DifferenceEstimator::Subject* subject =
+      difference_estimator.MakeSubject(Region(kString2, sizeof(kString2)-1));
+  EXPECT_EQ(1, difference_estimator.Measure(base, subject));
+}