#include "sliding_tile_lib.h"

#include "gtest/gtest.h"
#include "gmock/gmock.h"
#include <vector>

TEST(Adjacency, Adjacency) {
	const signed char LEFT  = -1;
	const signed char RIGHT = +1;
	const signed char UP    = -BOARD_DIM;
	const signed char DOWN  = +BOARD_DIM;
  for (int i = 0; i < BOARD_SIZE; i++) {
    SCOPED_TRACE(i);
    std::vector<signed char> expected;
	  if (i >= BOARD_DIM) {
		  expected.push_back(i + UP);
	  }
	  if (i < BOARD_SIZE - BOARD_DIM) {
		  expected.push_back(i + DOWN);
	  }
	  if (i % BOARD_DIM != 0) {
		  expected.push_back(i + LEFT);
	  }
	  if (i % BOARD_DIM != BOARD_DIM - 1) {
		  expected.push_back(i + RIGHT);
	  }

    std::vector<signed char> actual;
    for (int j = 0; adjacent[i][j] >= 0; j++) {
      actual.push_back(adjacent[i][j]);
    }
    EXPECT_THAT(actual, testing::UnorderedElementsAreArray(expected));
  }
}