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// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/base/fixed_size_lru_cache.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
class EmptyDeleter {
public:
void operator()(double) {}
};
class CacheTest : public ::testing::Test {
public:
FixedSizeLRUCache<int, double, 4, EmptyDeleter> cache;
};
TEST_F(CacheTest, Create) {
EXPECT_EQ(cache.size(), 0);
EXPECT_TRUE(cache.empty());
}
TEST_F(CacheTest, Add3) {
cache.put(11, -1.0);
cache.put(12, -2.0);
cache.put(13, -3.0);
EXPECT_EQ(cache.find(10), cache.end());
EXPECT_NE(cache.find(11), cache.end());
EXPECT_NE(cache.find(12), cache.end());
EXPECT_NE(cache.find(13), cache.end());
EXPECT_DOUBLE_EQ(cache.find(11)->value, -1.0);
EXPECT_DOUBLE_EQ(cache.find(12)->value, -2.0);
EXPECT_DOUBLE_EQ(cache.find(13)->value, -3.0);
}
TEST_F(CacheTest, Replacement) {
cache.put(11, -1.0);
cache.put(12, -2.0);
cache.put(12, -3.0);
EXPECT_EQ(cache.find(10), cache.end());
EXPECT_NE(cache.find(11), cache.end());
EXPECT_NE(cache.find(12), cache.end());
EXPECT_DOUBLE_EQ(cache.find(11)->value, -1.0);
EXPECT_DOUBLE_EQ(cache.find(12)->value, -3.0);
}
TEST_F(CacheTest, Evict) {
cache.put(11, -1.0);
cache.put(12, -2.0);
cache.put(13, -3.0);
cache.put(14, -4.0);
cache.find(11);
// This should evict 12, since we're a LRU cache.
cache.put(15, -5.0);
EXPECT_EQ(cache.find(10), cache.end());
EXPECT_EQ(cache.find(12), cache.end());
EXPECT_NE(cache.find(11), cache.end());
EXPECT_NE(cache.find(13), cache.end());
EXPECT_NE(cache.find(14), cache.end());
EXPECT_NE(cache.find(15), cache.end());
EXPECT_DOUBLE_EQ(cache.find(11)->value, -1.0);
EXPECT_DOUBLE_EQ(cache.find(13)->value, -3.0);
EXPECT_DOUBLE_EQ(cache.find(14)->value, -4.0);
EXPECT_DOUBLE_EQ(cache.find(15)->value, -5.0);
}
} // namespace
} // namespace base