auto cache = std::make_unique<Cache>();

  TF_ASSERT_OK_AND_ASSIGN(auto key, BuildSampleSignature("foo"));
  auto cache_value = cache->Lookup(key);

  EXPECT_FALSE(cache_value.has_value());
}

TEST(DeviceCompilationCacheTest, LookupOrCreateEntryDoesntExist) {
  auto cache = std::make_unique<Cache>();

  TF_ASSERT_OK_AND_ASSIGN(auto key, BuildSampleSignature("foo"));
  Cache::Value cache_value = cache->LookupOrCreate(key);