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// 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(0U, 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(10U, 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(1U, 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(1U, difference_estimator.Measure(base, subject));
}
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