psemek/libs/util/tests/lru_cache.cpp

158 lines
3.2 KiB
C++

#include <psemek/test/test.hpp>
#include <psemek/util/lru_cache.hpp>
#include <psemek/util/function.hpp>
#include <unordered_map>
using namespace psemek::util;
test_case(util_lru__cache_empty)
{
lru_cache<int, int> c(64);
expect_equal(c.size(), 0);
expect(c.empty());
}
test_case(util_lru__cache_insert)
{
lru_cache<int, int> c(64);
expect_equal(c.size(), 0);
expect(c.empty());
for (int key = 0; key < 32; ++key)
{
int const value = key * key;
c.insert(key, value);
expect_lequal(c.size(), key + 1);
expect(c.contains(key));
expect(c.find(key) != c.end());
expect_equal(c.at(key), value);
expect_equal(c.find(key)->first, key);
expect_equal(c.find(key)->second, value);
}
}
test_case(util_lru__cache_iterate)
{
lru_cache<int, int> c(64);
expect_equal(c.size(), 0);
expect(c.empty());
std::unordered_map<int, int> inserted;
for (int key = 0; key < 32; ++key)
{
int const value = key * key;
c.insert(key, value);
inserted[key] = value;
}
for (auto const & p : c)
{
expect(inserted.contains(p.first));
expect_equal(inserted.at(p.first), p.second);
}
for (auto const & p : inserted)
{
expect(c.contains(p.first));
expect_equal(c.at(p.first), p.second);
}
}
test_case(util_lru__cache_shrink)
{
lru_cache<int, int> c(16);
expect_equal(c.size(), 0);
expect(c.empty());
expect_equal(c.max_size(), 16);
std::unordered_map<int, int> inserted;
for (int key = 0; key < 32; ++key)
{
int const value = key * key;
c.insert(key, value);
inserted[key] = value;
expect_lequal(c.size(), key + 1);
expect(c.contains(key));
expect(c.find(key) != c.end());
expect_equal(c.at(key), value);
expect_equal(c.find(key)->first, key);
expect_equal(c.find(key)->second, value);
expect_lequal(c.size(), c.max_size());
}
for (int key = 0; key < 16; ++key)
expect(!c.contains(key));
for (int key = 16; key < 32; ++key)
{
expect(c.contains(key));
expect_equal(c.at(key), inserted.at(key));
}
for (auto const & p : c)
{
expect(inserted.contains(p.first));
expect_equal(inserted.at(p.first), p.second);
}
}
test_case(util_lru__cache_touch)
{
lru_cache<int, int> c(64);
expect_equal(c.size(), 0);
expect(c.empty());
std::unordered_map<int, int> inserted;
for (int key = 0; key < 32; ++key)
{
int const value = key * key;
c.insert(key, value);
inserted[key] = value;
expect(c.find(key) == c.begin());
}
for (int key = 0; key < 32; ++key)
{
c.touch(key);
expect(c.find(key) == c.begin());
}
}
test_case(util_lru__cache_removable)
{
auto removable = [](int key, int){ return key % 2 == 1; };
lru_cache<int, int, function<bool(int, int)>> c(16, removable);
expect_equal(c.size(), 0);
expect(c.empty());
std::unordered_map<int, int> inserted;
for (int key = 0; key < 32; ++key)
{
int const value = key * key;
bool const is_removable = removable(key, value);
bool const should_contain = c.size() < c.max_size() || !is_removable;
c.insert(key, value);
inserted[key] = value;
if (should_contain)
expect(c.contains(key));
if (!is_removable)
expect(c.find(key) == c.begin());
}
expect_equal(c.size(), c.max_size());
for (auto const & p : c)
{
expect_equal(inserted.at(p.first), p.second);
expect(!removable(p.first, p.second));
}
}