test/grisu-test.cc

// Formatting library for C++ - Grisu tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.

#include "fmt/format.h"
#include "gtest.h"

static bool reported_skipped;

#undef TEST
#define TEST(test_fixture, test_name)        \
  void test_fixture##test_name();            \
  GTEST_TEST(test_fixture, test_name) {      \
    if (FMT_USE_GRISU) {                     \
      test_fixture##test_name();             \
    } else if (!reported_skipped) {          \
      reported_skipped = true;               \
      fmt::print("Skipping Grisu tests.\n"); \
    }                                        \
  }                                          \
  void test_fixture##test_name()

TEST(GrisuTest, NaN) {
  auto nan = std::numeric_limits<double>::quiet_NaN();
  EXPECT_EQ("nan", fmt::format("{}", nan));
  EXPECT_EQ("-nan", fmt::format("{}", -nan));
}

TEST(GrisuTest, Inf) {
  auto inf = std::numeric_limits<double>::infinity();
  EXPECT_EQ("inf", fmt::format("{}", inf));
  EXPECT_EQ("-inf", fmt::format("{}", -inf));
}

TEST(GrisuTest, Zero) { EXPECT_EQ("0.0", fmt::format("{}", 0.0)); }

TEST(GrisuTest, Round) {
  EXPECT_EQ("1.9156918820264798e-56",
            fmt::format("{}", 1.9156918820264798e-56));
  EXPECT_EQ("0.0000", fmt::format("{:.4f}", 7.2809479766055470e-15));
}

TEST(GrisuTest, Prettify) {
  EXPECT_EQ("0.0001", fmt::format("{}", 1e-4));
  EXPECT_EQ("1e-05", fmt::format("{}", 1e-5));
  EXPECT_EQ("9.999e-05", fmt::format("{}", 9.999e-5));
  EXPECT_EQ("10000000000.0", fmt::format("{}", 1e10));
  EXPECT_EQ("100000000000.0", fmt::format("{}", 1e11));
  EXPECT_EQ("12340000000.0", fmt::format("{}", 1234e7));
  EXPECT_EQ("12.34", fmt::format("{}", 1234e-2));
  EXPECT_EQ("0.001234", fmt::format("{}", 1234e-6));
  EXPECT_EQ("0.1", fmt::format("{}", 0.1f));
  EXPECT_EQ("0.10000000149011612", fmt::format("{}", double(0.1f)));
}

TEST(GrisuTest, ZeroPrecision) { EXPECT_EQ("1", fmt::format("{:.0}", 1.0)); }

TEST(GrisuTest, Fallback) {
  EXPECT_EQ("1e+23", fmt::format("{}", 1e23));
  EXPECT_EQ("9e-265", fmt::format("{}", 9e-265));
  EXPECT_EQ("5.423717798060526e+125",
            fmt::format("{}", 5.423717798060526e+125));
  EXPECT_EQ("1.372371880954233e-288",
            fmt::format("{}", 1.372371880954233e-288));
  EXPECT_EQ("55388492.622190244", fmt::format("{}", 55388492.622190244));
  EXPECT_EQ("2.2506787569811123e-253",
            fmt::format("{}", 2.2506787569811123e-253));
  EXPECT_EQ("1103618912042992.8", fmt::format("{}", 1103618912042992.8));
  // pow(2, -25) - assymetric boundaries:
  EXPECT_EQ("2.9802322387695312e-08",
            fmt::format("{}", 2.9802322387695312e-08));
}