starboard/client_porting/cwrappers/pow_wrapper_test.cc

// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "starboard/client_porting/cwrappers/pow_wrapper.h"

#include <cmath>
#include <limits>

#include "testing/gtest/include/gtest/gtest.h"

namespace {

TEST(PowWrapperTest, SunnyDay) {
  EXPECT_EQ(1.0, pow(1.0, 1.0));
  EXPECT_EQ(2.0, pow(2.0, 1.0));
  EXPECT_EQ(1.0, pow(1.0, 2.0));
  EXPECT_EQ(256.0, pow(2.0, 8.0));
  EXPECT_EQ(0.5, pow(2.0, -1.0));

  const double kNan = std::numeric_limits<double>::quiet_NaN();
  EXPECT_EQ(1.0, pow(1.0, kNan));
  EXPECT_EQ(1.0, pow(kNan, 0.0));
  EXPECT_TRUE(std::isnan(pow(2.0, kNan)));
  EXPECT_TRUE(std::isnan(pow(kNan, 1.0)));
  EXPECT_TRUE(std::isnan(pow(kNan, 2.0)));

  const double kInfinity = std::numeric_limits<double>::infinity();
  EXPECT_EQ(0.0, pow(0.5, kInfinity));
  EXPECT_EQ(1.0, pow(1.0, kInfinity));
  EXPECT_EQ(0.0, pow(2.0, -kInfinity));
  EXPECT_FALSE(std::isfinite(pow(2.0, kInfinity)));
  EXPECT_FALSE(std::isfinite(pow(0.5, -kInfinity)));
}

}  // namespace