450 lines
12 KiB
Go
450 lines
12 KiB
Go
package chess_test
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import (
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"fmt"
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"os"
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"path"
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"testing"
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"github.com/ekzyis/chessbot/chess"
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"github.com/stretchr/testify/assert"
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)
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func init() {
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// change working directory to the root of the project
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// so assets/ can be found
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wd, _ := os.Getwd()
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os.Chdir(path.Dir(wd))
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}
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func TestBoardInitial(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertPiece(t, b, "a1", chess.Rook, chess.Light)
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assertPiece(t, b, "b1", chess.Knight, chess.Light)
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assertPiece(t, b, "c1", chess.Bishop, chess.Light)
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assertPiece(t, b, "d1", chess.Queen, chess.Light)
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assertPiece(t, b, "e1", chess.King, chess.Light)
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assertPiece(t, b, "f1", chess.Bishop, chess.Light)
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assertPiece(t, b, "g1", chess.Knight, chess.Light)
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assertPiece(t, b, "h1", chess.Rook, chess.Light)
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assertPiece(t, b, "a2", chess.Pawn, chess.Light)
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assertPiece(t, b, "b2", chess.Pawn, chess.Light)
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assertPiece(t, b, "c2", chess.Pawn, chess.Light)
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assertPiece(t, b, "d2", chess.Pawn, chess.Light)
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assertPiece(t, b, "e2", chess.Pawn, chess.Light)
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assertPiece(t, b, "f2", chess.Pawn, chess.Light)
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assertPiece(t, b, "g2", chess.Pawn, chess.Light)
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assertPiece(t, b, "h2", chess.Pawn, chess.Light)
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assertPiece(t, b, "a8", chess.Rook, chess.Dark)
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assertPiece(t, b, "b8", chess.Knight, chess.Dark)
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assertPiece(t, b, "c8", chess.Bishop, chess.Dark)
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assertPiece(t, b, "d8", chess.Queen, chess.Dark)
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assertPiece(t, b, "e8", chess.King, chess.Dark)
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assertPiece(t, b, "f8", chess.Bishop, chess.Dark)
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assertPiece(t, b, "g8", chess.Knight, chess.Dark)
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assertPiece(t, b, "h8", chess.Rook, chess.Dark)
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assertPiece(t, b, "a7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "b7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "c7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "d7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "e7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "f7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "g7", chess.Pawn, chess.Dark)
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assertPiece(t, b, "h7", chess.Pawn, chess.Dark)
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}
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func TestBoardMovePawn(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "e4")
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assertNoPiece(t, b, "e2")
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assertPiece(t, b, "e4", chess.Pawn, chess.Light)
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assertParse(t, b, "e5")
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assertNoPiece(t, b, "e7")
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assertPiece(t, b, "e5", chess.Pawn, chess.Dark)
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}
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func TestBoardMovePawnInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "a5", "no pawn found that can move to a5")
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assertMoveError(t, b, "b5", "no pawn found that can move to b5")
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assertMoveError(t, b, "c5", "no pawn found that can move to c5")
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assertMoveError(t, b, "d5", "no pawn found that can move to d5")
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assertMoveError(t, b, "e5", "no pawn found that can move to e5")
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assertMoveError(t, b, "f5", "no pawn found that can move to f5")
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assertMoveError(t, b, "g5", "no pawn found that can move to g5")
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assertMoveError(t, b, "h5", "no pawn found that can move to h5")
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assertParse(t, b, "d4")
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assertMoveError(t, b, "a4", "no pawn found that can move to a4")
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assertMoveError(t, b, "b4", "no pawn found that can move to b4")
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assertMoveError(t, b, "c4", "no pawn found that can move to c4")
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assertMoveError(t, b, "d4", "no pawn found that can move to d4")
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assertMoveError(t, b, "e4", "no pawn found that can move to e4")
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assertMoveError(t, b, "f4", "no pawn found that can move to f4")
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assertMoveError(t, b, "g4", "no pawn found that can move to g4")
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assertMoveError(t, b, "h4", "no pawn found that can move to h4")
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}
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func TestBoardMovePawnCapture(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "e4 d5 exd5")
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assertNoPiece(t, b, "e4")
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assertPiece(t, b, "d5", chess.Pawn, chess.Light)
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// test ambiguous capture
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b = chess.NewBoard()
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assertParse(t, b, "c4 d5 e4 e5 exd5")
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assertNoPiece(t, b, "e4")
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assertPiece(t, b, "d5", chess.Pawn, chess.Light)
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assertPiece(t, b, "c4", chess.Pawn, chess.Light)
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b = chess.NewBoard()
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assertParse(t, b, "c4 d5 e4 e5 cxd5")
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assertNoPiece(t, b, "c4")
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assertPiece(t, b, "d5", chess.Pawn, chess.Light)
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assertPiece(t, b, "e4", chess.Pawn, chess.Light)
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}
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func TestBoardMoveKnight(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "Nf3")
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assertPiece(t, b, "f3", chess.Knight, chess.Light)
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assertNoPiece(t, b, "g1")
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assertParse(t, b, "Nh6")
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assertPiece(t, b, "h6", chess.Knight, chess.Dark)
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assertNoPiece(t, b, "g8")
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assertParse(t, b, "Nc3")
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assertPiece(t, b, "c3", chess.Knight, chess.Light)
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assertNoPiece(t, b, "b1")
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assertParse(t, b, "Na6")
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assertPiece(t, b, "a6", chess.Knight, chess.Dark)
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assertNoPiece(t, b, "b8")
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assertParse(t, b, "Nh4")
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assertPiece(t, b, "h4", chess.Knight, chess.Light)
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assertNoPiece(t, b, "f3")
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assertParse(t, b, "Nf5")
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assertPiece(t, b, "f5", chess.Knight, chess.Dark)
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assertNoPiece(t, b, "h6")
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assertParse(t, b, "Na4")
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assertPiece(t, b, "a4", chess.Knight, chess.Light)
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assertNoPiece(t, b, "c3")
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assertParse(t, b, "Nc5")
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assertPiece(t, b, "c5", chess.Knight, chess.Dark)
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assertNoPiece(t, b, "a6")
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}
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func TestBoardMoveKnightInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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// out of reach
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assertMoveError(t, b, "Ng3", "no knight found that can move to g3")
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assertMoveError(t, b, "Nb3", "no knight found that can move to b3")
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// blocked by own piece
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assertMoveError(t, b, "Ng1", "g1 blocked by white knight")
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assertMoveError(t, b, "Nd2", "d2 blocked by white pawn")
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assertMoveError(t, b, "Ne2", "e2 blocked by white pawn")
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assertParse(t, b, "Nf3")
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assertMoveError(t, b, "Ng6", "no knight found that can move to g6")
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assertMoveError(t, b, "Nb6", "no knight found that can move to b6")
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assertMoveError(t, b, "Ne7", "e7 blocked by black pawn")
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assertMoveError(t, b, "Nd7", "d7 blocked by black pawn")
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// ambiguous moves
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b = chess.NewBoard()
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assertParse(t, b, "e4 e5 Nf3 d6 Nc3 d5 Nb5 d4")
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assertMoveError(t, b, "Nxd4", "move ambiguous: 2 knights can move to d4")
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assertMoveError(t, b, "N4xd4", "no knight found that can move to d4")
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// disambiguate via file
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assertParse(t, b, "Nfxd4")
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b = chess.NewBoard()
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assertParse(t, b, "e4 e5 Nf3 d6 Nc3 d5 Nb5 d4")
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// disambiguate via rank
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assertParse(t, b, "N3xd4")
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}
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func TestBoardMoveKnightCapture(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "e4 Nf6 d4 Nxe4")
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assertPiece(t, b, "e4", chess.Knight, chess.Dark)
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assertPiece(t, b, "d4", chess.Pawn, chess.Light)
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assertNoPiece(t, b, "g8")
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assertNoPiece(t, b, "e2")
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assertNoPiece(t, b, "d2")
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// test ambiguous capture
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b = chess.NewBoard()
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assertParse(t, b, "e4 e5 Nf3 d6 Nc3 d5 Nb5 d4 Nbxd4")
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assertPiece(t, b, "e4", chess.Pawn, chess.Light)
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assertPiece(t, b, "e5", chess.Pawn, chess.Dark)
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assertPiece(t, b, "d4", chess.Knight, chess.Light)
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assertPiece(t, b, "f3", chess.Knight, chess.Light)
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assertNoPiece(t, b, "g1")
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assertNoPiece(t, b, "b1")
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assertNoPiece(t, b, "c3")
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assertNoPiece(t, b, "d6")
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assertNoPiece(t, b, "d5")
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assertNoPiece(t, b, "b5")
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b = chess.NewBoard()
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assertParse(t, b, "e4 e5 Nf3 d6 Nc3 d5 Nb5 d4 Nfxd4")
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assertPiece(t, b, "e4", chess.Pawn, chess.Light)
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assertPiece(t, b, "e5", chess.Pawn, chess.Dark)
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assertPiece(t, b, "d4", chess.Knight, chess.Light)
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assertPiece(t, b, "b5", chess.Knight, chess.Light)
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assertNoPiece(t, b, "g1")
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assertNoPiece(t, b, "b1")
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assertNoPiece(t, b, "c3")
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assertNoPiece(t, b, "d6")
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assertNoPiece(t, b, "d5")
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assertNoPiece(t, b, "f3")
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}
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func TestBoardMoveBishop(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Bc4", "no bishop found that can move to c4")
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assertParse(t, b, "e3")
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assertParse(t, b, "e6")
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assertParse(t, b, "Bc4")
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assertPiece(t, b, "c4", chess.Bishop, chess.Light)
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assertNoPiece(t, b, "f1")
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assertParse(t, b, "Bc5")
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assertPiece(t, b, "c5", chess.Bishop, chess.Dark)
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assertNoPiece(t, b, "f8")
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}
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func TestBoardMoveBishopInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Bc3", "no bishop found that can move to c3")
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assertMoveError(t, b, "Bc2", "c2 blocked by white pawn")
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assertMoveError(t, b, "Bb2", "b2 blocked by white pawn")
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// path blocked by white pawn at e2
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assertMoveError(t, b, "Bd3", "no bishop found that can move to d3")
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}
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func TestBoardMoveBishopCapture(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "e4 e5 Bc4 d5 Bxd5")
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assertPiece(t, b, "e4", chess.Pawn, chess.Light)
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assertPiece(t, b, "e5", chess.Pawn, chess.Dark)
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assertPiece(t, b, "d5", chess.Bishop, chess.Light)
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assertNoPiece(t, b, "f1")
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assertNoPiece(t, b, "e2")
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assertNoPiece(t, b, "e7")
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assertNoPiece(t, b, "d7")
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// bishop captures are never ambiguous because they can only move on same color
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}
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func TestBoardMoveRook(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Ra3", "no rook found that can move to a3")
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assertParse(t, b, "a4 a5 Ra3")
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assertPiece(t, b, "a3", chess.Rook, chess.Light)
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assertNoPiece(t, b, "a1")
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assertParse(t, b, "Ra6")
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assertPiece(t, b, "a6", chess.Rook, chess.Dark)
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assertNoPiece(t, b, "a8")
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}
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func TestBoardMoveRookCapture(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "a4 e6 h4 e5 Ra3 e4 Rhh3 e3 Raxe3")
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assertPiece(t, b, "e3", chess.Rook, chess.Light)
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assertPiece(t, b, "h3", chess.Rook, chess.Light)
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assertNoPiece(t, b, "a3")
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}
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func TestBoardMoveRookInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Rb2", "b2 blocked by white pawn")
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assertMoveError(t, b, "Rb1", "b1 blocked by white knight")
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assertMoveError(t, b, "Ra2", "a2 blocked by white pawn")
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assertMoveError(t, b, "Ra3", "no rook found that can move to a3")
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assertParse(t, b, "e3 e6 a4 d6 Ra3")
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// path blocked by pawn at d3
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assertMoveError(t, b, "Rh3", "no rook found that can move to h3")
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// ambiguous moves
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b = chess.NewBoard()
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assertParse(t, b, "a4 e6 h4 e5 Ra3 e4")
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assertMoveError(t, b, "Rh3", "move ambiguous: 2 rooks can move to h3")
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assertParse(t, b, "Rhh3")
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}
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func TestBoardMoveQueen(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Qd3", "no queen found that can move to d3")
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assertParse(t, b, "d4")
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assertParse(t, b, "d5")
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assertParse(t, b, "Qd3")
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assertPiece(t, b, "d3", chess.Queen, chess.Light)
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assertNoPiece(t, b, "d1")
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assertParse(t, b, "Qd6")
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assertPiece(t, b, "d6", chess.Queen, chess.Dark)
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assertNoPiece(t, b, "d8")
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}
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func TestBoardMoveQueenInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Qd2", "d2 blocked by white pawn")
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assertMoveError(t, b, "Qd1", "d1 blocked by white queen")
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assertMoveError(t, b, "Qe1", "e1 blocked by white king")
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assertMoveError(t, b, "Qc1", "c1 blocked by white bishop")
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// path blocked by white pawn at d2
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assertMoveError(t, b, "Qd3", "no queen found that can move to d3")
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}
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func TestBoardMoveKing(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertParse(t, b, "e4 e5 Ke2 Ke7 Kf3 Kd6 Kg3 Kc6")
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assertNoPiece(t, b, "e1")
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assertNoPiece(t, b, "e8")
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assertNoPiece(t, b, "e2")
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assertNoPiece(t, b, "e7")
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assertNoPiece(t, b, "f3")
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assertNoPiece(t, b, "d6")
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assertPiece(t, b, "g3", chess.King, chess.Light)
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assertPiece(t, b, "c6", chess.King, chess.Dark)
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}
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func TestBoardMoveKingInvalid(t *testing.T) {
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t.Parallel()
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b := chess.NewBoard()
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assertMoveError(t, b, "Ke1", "e1 blocked by white king")
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assertMoveError(t, b, "Ke2", "e2 blocked by white pawn")
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assertMoveError(t, b, "Ke3", "no king found that can move to e3")
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}
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func assertParse(t *testing.T, b *chess.Board, moves string) {
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assert.NoError(t, b.Parse(moves))
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}
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func assertPiece(t *testing.T, b *chess.Board, position string, name chess.PieceName, color chess.Color) {
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p := b.At(position)
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c := "white"
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if color == chess.Dark {
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c = "black"
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}
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msg := fmt.Sprintf("expected %s %s at %s", c, name, position)
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if assert.NotNil(t, p, msg) {
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assert.Equal(t, name, p.Name, msg)
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assert.Equal(t, color, p.Color, msg)
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}
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}
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func assertNoPiece(t *testing.T, b *chess.Board, position string) {
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p := b.At(position)
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assert.Nil(t, p, "expected no piece at %s", position)
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}
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func assertMoveError(t *testing.T, b *chess.Board, position string, message string) {
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assert.ErrorContains(t, b.Move(position), message)
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}
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