cpp-game-engine/math/test/common_test.cxx

//
//  common_test.cxx
//  math-test
//
//  Created by Sam Jaffe on 5/5/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#include <cmath>
#include <gmock/gmock.h>

#include "game/math/angle.hpp"
#include "game/math/common.hpp"
#include "game/math/shape.hpp"

#include "test_printers.h"

using namespace math::dim2;
using namespace testing;

template <typename T, typename G>
decltype(auto) generate(T min, T max, T step, G && generator) {
  std::vector<decltype(generator(min))> out;
  for (T val = min; val < max; val += step) {
    out.emplace_back(generator(val));
  }
  return out;
}

template <typename T> decltype(auto) generate(T min, T max, T step) {
  auto identity = [](T const & val) { return val; };
  return generate(min, max, step, identity);
}

struct LineTest : TestWithParam<std::tuple<point, int>> {};

TEST_P(LineTest, ExistsOnOriginLine) {
  point const end = std::get<0>(GetParam());
  line const ln{{{0, 0}}, end};
  point const pt = end * std::get<1>(GetParam()) / 100.f;
  EXPECT_TRUE(math::contains(ln, pt));
}

std::vector<point> const line_ends{
  {{1, 1}}, {{0, 1}}, {{1, 0}}
};

INSTANTIATE_TEST_CASE_P(ContainsPoint, LineTest,
    Combine(ValuesIn(line_ends), ValuesIn(generate(0, 100, 10))));

struct UnitCircleTest : TestWithParam<point> {};

TEST_P(UnitCircleTest, ExistsInCircle) {
  circle unit{{{0, 0}}, 1};
  EXPECT_TRUE(math::contains(unit, GetParam()));
}

TEST_P(UnitCircleTest, OutsideSmallerCircle) {
  circle subunit{{{0, 0}}, 0.9999};
  EXPECT_FALSE(math::contains(subunit, GetParam()));
}

point unit_circle_angle(math::degree degs) {
  return point(make_vector(math::sin(degs), math::cos(degs)));
}

INSTANTIATE_TEST_CASE_P(LiesOnEdge, UnitCircleTest,
    ValuesIn(generate(0.0, 360.0, 5.0, unit_circle_angle)));