@Test public void shouldReturnTrueIfWordToSearchIsInsideWordSearch() {

  char[][] matrix = {
      { 'a', 'a', 'c', 'd', 'e' }, { 'a', 'd', 'a', 'r', 'c' }, { 'a', 'd', 'a', 'c', 'c' },
      { 'b', 'a', 'c', 'o', 'o' }
  };
  boolean result = wordSearch.contains(matrix, "baco");
  assertTrue(result);
}