add test cases (very little)

Author: winapiadmin

test.py

@@ -1720,6 +1720,18 @@ def test_impossible_check_due_to_en_passant(self):
         self.assertFalse(board.has_legal_en_passant())
         self.assertEqual(len(list(board.legal_moves)), 2)
 
+    def test_multiple_kings(self):
+        board = chess.Board("KKKK1kkk/8/8/8/8/8/8/8 w - - 0 1")
+        self.assertEqual(board.king(chess.WHITE), None)
+
+        # https://github.com/niklasf/python-chess/issues/1169#issuecomment-3838025276
+        board = chess.Board(None)
+        board.set_piece_at(chess.A1, chess.Piece(chess.ROOK, chess.WHITE))
+        board.set_piece_at(chess.A8, chess.Piece(chess.KING, chess.BLACK)) # attacked
+        board.set_piece_at(chess.H8, chess.Piece(chess.KING, chess.BLACK)) # safe
+        board.turn = chess.WHITE
+        self.assertTrue(board.was_into_check())
+
 
 class LegalMoveGeneratorTestCase(unittest.TestCase):