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#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <vector>
#include "prometheus/counter.h"
#include "prometheus/detail/future_std.h"
#include "prometheus/family.h"
#include "prometheus/metric_family.h"
#include "prometheus/text_serializer.h"
#include "raii_locale.h"
namespace prometheus {
namespace {
class SerializerTest : public testing::Test {
public:
void SetUp() override {
Family<Counter> family{"requests_total", "", {}};
auto& counter = family.Add({});
counter.Increment();
collected = family.Collect();
}
std::vector<MetricFamily> collected;
TextSerializer textSerializer;
};
#ifndef _WIN32
// This test expects a working German locale to test that floating
// point numbers do not use , but . as a delimiter.
//
// On Debian systems they can be generated by "locale-gen de_DE.UTF-8"
TEST_F(SerializerTest, shouldSerializeLocaleIndependent) {
std::unique_ptr<RAIILocale> localeWithCommaDecimalSeparator;
// ignore missing locale and skip test if setup fails
try {
localeWithCommaDecimalSeparator =
detail::make_unique<RAIILocale>("de_DE.UTF-8");
} catch (std::runtime_error&) {
GTEST_SKIP();
}
const auto serialized = textSerializer.Serialize(collected);
EXPECT_THAT(serialized, testing::HasSubstr(" 1\n"));
}
#endif
TEST_F(SerializerTest, shouldRestoreStreamState) {
std::ostringstream os;
// save stream state
auto saved_flags = os.flags();
auto saved_precision = os.precision();
auto saved_width = os.width();
auto saved_fill = os.fill();
auto saved_locale = os.getloc();
// serialize
textSerializer.Serialize(os, collected);
// check for expected flags
EXPECT_EQ(os.flags(), saved_flags);
EXPECT_EQ(os.precision(), saved_precision);
EXPECT_EQ(os.width(), saved_width);
EXPECT_EQ(os.fill(), saved_fill);
EXPECT_EQ(os.getloc(), saved_locale);
}
} // namespace
} // namespace prometheus
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