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

//
//  shape_test.cxx
//  math
//
//  Created by Sam Jaffe on 5/4/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#include <gmock/gmock.h>

#include "game/math/shape.hpp"

namespace math { namespace vector {
  std::ostream & operator<<(std::ostream & os, math::vec2 const & p) {
    return os << '[' << p[0] << ',' << p[1] << ']';
  }
} }
namespace math { namespace dim2 {
  std::ostream & operator<<(std::ostream & os, line const & l) {
    return os << '[' << l.first << ',' << l.second << ']';
  }
} }

struct FromOriginTest : testing::TestWithParam<math::dim2::line> {};

TEST_P(FromOriginTest, IntersectsAtOrigin) {
  math::dim2::line l1 = { GetParam().first, {{0, 0}} };
  math::dim2::line l2 = { {{0, 0}}, GetParam().second };
  
  EXPECT_THAT(math::lines::intersection(l1, l2),
              testing::Eq(math::dim2::point{{0, 0}}));
}

std::vector<math::dim2::line> const point_pairs{
  {{{1, 1}}, {{0, 0}}},
  {{{1, 1}}, {{1, 0}}},
  {{{1, 1}}, {{0, 1}}},
  {{{1, 1}}, {{1, 1}}},
  {{{1, 1}}, {{2, 1}}},
  {{{2, 3}}, {{1, 2}}},
  {{{1, 1}}, {{-1,  0}}},
  {{{1, 1}}, {{ 0, -1}}},
  {{{1, 1}}, {{-1, -1}}},
};

INSTANTIATE_TEST_CASE_P(LineIntersection, FromOriginTest,
                        testing::ValuesIn(point_pairs));