cpp-mathematic-limit/test/limit_test.cxx

//
//  limit_test.cxx
//  limit
//
//  Created by Sam Jaffe on 2/3/17.
//

#include "math/limit.h"

#include "xcode_gtest_helper.h"

using Number = math::Bound<int, -5, +7>;

TEST(BoundNumber, ConstructsInbounds) { EXPECT_EQ(Number(0), 0); }

TEST(BoundNumber, ValidateOOBLow) {
  EXPECT_THROW(Number(math::assert_bounds, -6), std::out_of_range);
}

TEST(BoundNumber, ValidateOOBHigh) {
  EXPECT_THROW(Number(math::assert_bounds, +8), std::out_of_range);
}

TEST(BoundNumber, ClampsOOBLow) { EXPECT_EQ(Number(-6), Number::min); }

TEST(BoundNumber, ClampsOOBHigh) { EXPECT_EQ(Number(+8), Number::max); }

TEST(BoundNumber, IncrementIsLimitSafe) {
  Number value(Number::max);
  EXPECT_EQ(value, Number::max);
  EXPECT_EQ(value++, Number::max);
  EXPECT_EQ(value, Number::max);
}

TEST(BoundNumber, DecrementIsLimitSafe) {
  Number value(Number::min);
  EXPECT_EQ(value, Number::min);
  EXPECT_EQ(value--, Number::min);
  EXPECT_EQ(value, Number::min);
}