Source/core/loader/cache/MemoryCacheTest.cpp

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#include "config.h"
#include "core/loader/cache/MemoryCache.h"

#include "core/loader/cache/CachedRawResource.h"
#include "core/loader/cache/CachedResourceHandle.h"
#include "core/platform/network/ResourceRequest.h"
#include "wtf/OwnPtr.h"

#include <gtest/gtest.h>

namespace WebCore {

class MemoryCacheTest : public ::testing::Test {
protected:
    virtual void SetUp()
    {
        // Save the global memory cache to restore it upon teardown.
        m_globalMemoryCache = adoptPtr(memoryCache());
        // Create the test memory cache instance and hook it in.
        m_testingMemoryCache = adoptPtr(new MemoryCache());
        setMemoryCacheForTesting(m_testingMemoryCache.leakPtr());
    }

    virtual void TearDown()
    {
        // Regain the ownership of testing memory cache, so that it will be
        // destroyed.
        m_testingMemoryCache = adoptPtr(memoryCache());
        // Yield the ownership of the global memory cache back.
        setMemoryCacheForTesting(m_globalMemoryCache.leakPtr());
    }

    OwnPtr<MemoryCache> m_testingMemoryCache;
    OwnPtr<MemoryCache> m_globalMemoryCache;
};

// Verifies that setters and getters for cache capacities work correcty.
TEST_F(MemoryCacheTest, CapacityAccounting)
{
    const unsigned totalCapacity = 100;
    const unsigned minDeadCapacity = 10;
    const unsigned maxDeadCapacity = 50;
    memoryCache()->setCapacities(minDeadCapacity, maxDeadCapacity, totalCapacity);

    ASSERT_EQ(totalCapacity, memoryCache()->capacity());
    ASSERT_EQ(minDeadCapacity, memoryCache()->minDeadCapacity());
    ASSERT_EQ(maxDeadCapacity, memoryCache()->maxDeadCapacity());
}

// Verifies that dead resources that exceed dead resource capacity are evicted
// from cache when pruning.
TEST_F(MemoryCacheTest, DeadResourceEviction)
{
    const unsigned totalCapacity = 1000000;
    const unsigned minDeadCapacity = 0;
    const unsigned maxDeadCapacity = 0;
    memoryCache()->setCapacities(minDeadCapacity, maxDeadCapacity, totalCapacity);

    CachedResourceHandle<CachedResource> cachedResource =
        new CachedResource(ResourceRequest(""), CachedResource::RawResource);
    const char data[5] = "abcd";
    cachedResource->appendData(data, 3);
    // The resource size has to be nonzero for this test to be meaningful, but
    // we do not rely on it having any particular value.
    ASSERT_GT(cachedResource->size(), 0u);

    ASSERT_EQ(0u, memoryCache()->deadSize());
    ASSERT_EQ(0u, memoryCache()->liveSize());

    memoryCache()->add(cachedResource.get());
    ASSERT_EQ(cachedResource->size(), memoryCache()->deadSize());
    ASSERT_EQ(0u, memoryCache()->liveSize());

    memoryCache()->prune();
    ASSERT_EQ(0u, memoryCache()->deadSize());
    ASSERT_EQ(0u, memoryCache()->liveSize());
}

} // namespace