hash_helpers.test.cc

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#include <gtest/gtest.h>
 
#include <string>
#include <tuple>
#include <unordered_map>
#include <utility>
#include <vector>
 
#include "base/stl_helpers/hash_helpers.hh"
 
using namespace gem5;
 
TEST(HashHelpers, isHashEnabled)
{
    EXPECT_TRUE(stl_helpers::is_hash_enabled<int>);
    EXPECT_TRUE(stl_helpers::is_hash_enabled<long>);
    EXPECT_TRUE(stl_helpers::is_hash_enabled<double>);
    EXPECT_TRUE(stl_helpers::is_hash_enabled<std::string>);
    EXPECT_TRUE(stl_helpers::is_hash_enabled<void*>);
    using vector_t = std::vector<int>;
    EXPECT_TRUE(stl_helpers::is_hash_enabled<vector_t>);
    using tuple_t = std::tuple<int, bool, int**, std::string(*)(float)>;
    EXPECT_TRUE(stl_helpers::is_hash_enabled<tuple_t>);
    EXPECT_TRUE((stl_helpers::is_hash_enabled<std::pair<vector_t, tuple_t>>));
    EXPECT_TRUE((stl_helpers::is_hash_enabled<
        std::unordered_map<tuple_t, vector_t>>));
}
 
// The following tests do not test the hash value as it is considered an
// implementation detail and there is no contract on the way that value is
// computed. Testing for hash quality is extremelly computationnaly intensive
// and is not suitable for unit tests. Consider these tests to be more of a
// "does it compile?" check as well as a small set of examples for the user.
TEST(HashHelpers, hashPair)
{
    auto p = std::make_pair(1, std::string("hello"));
    auto hashVal = stl_helpers::hash_value(p);
    auto hashFunc = stl_helpers::hash<std::pair<int, std::string>>{};
    EXPECT_EQ(hashVal, hashFunc(p));
}
 
TEST(HashHelpers, hashTuple)
{
    auto t = std::make_tuple(1, "hello", 4.2, std::make_pair(true, 0.f));
    auto hashVal = stl_helpers::hash_value(t);
    auto hashFunc = stl_helpers::hash<decltype(t)>{};
    EXPECT_EQ(hashVal, hashFunc(t));
}
 
TEST(HashHelpers, hashVector)
{
    auto v = std::vector<int>{1, 2, 3, 4, 5, 6, 7, 8, 9};
    auto hashVal = stl_helpers::hash_value(v);
    auto hashFunc = stl_helpers::hash<decltype(v)>{};
    EXPECT_EQ(hashVal, hashFunc(v));
}