chego/position_test.go at main · treepeck/chego · GitHub

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package chego

import "testing"

func TestMakeMove(t *testing.T) {
	cases := []struct {
		name     string
		fenStr   string
		expected string
		moved    Piece
		captured Piece
		move     Move
	}{
		{
			"pawn capture",
			"rnbqkbnr/ppp1pppp/8/3p4/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 1",
			"rnbqkbnr/ppp1pppp/8/3P4/2B5/5N2/PPPP1PPP/RNBQK2R b KQkq - 0 1",
			WPawn, BPawn, NewMove(SD5, SE4, MoveNormal),
		},
		{
			"white en passant",
			"rnbqkbnr/ppp1pppp/8/8/1Pp5/5N2/P1PP1PPP/RNBQK2R w KQkq c5 0 1",
			"rnbqkbnr/ppp1pppp/8/2P5/8/5N2/P1PP1PPP/RNBQK2R b KQkq - 0 1",
			WPawn, PieceNone, NewMove(SC5, SB4, MoveEnPassant),
		},
		{
			"black en passant",
			"2bqkbnr/4p1pp/8/5pP1/8/3N1N2/P1PP1P1P/RqBQK2R b KQkq g4 0 1",
			"2bqkbnr/4p1pp/8/8/6p1/3N1N2/P1PP1P1P/RqBQK2R w KQkq - 0 2",
			BPawn, PieceNone, NewMove(SG4, SF5, MoveEnPassant),
		},
		{
			"capture promotion",
			"rnbqkbnr/ppP1pppp/8/8/8/5N2/P1PP1PPP/RNBQK2R w KQkq - 0 1",
			"rRbqkbnr/pp2pppp/8/8/8/5N2/P1PP1PPP/RNBQK2R b KQkq - 0 1",
			WPawn, BKnight, NewPromotionMove(SB8, SC7, PromotionRook),
		},
		{
			"promotion",
			"2bqkbnr/4pppp/8/8/8/3N1N2/PpPP1PPP/R1BQK2R b KQkq - 0 1",
			"2bqkbnr/4pppp/8/8/8/3N1N2/P1PP1PPP/RqBQK2R w KQkq - 0 2",
			BPawn, PieceNone, NewPromotionMove(SB1, SB2, PromotionQueen),
		},
		{
			"white O-O",
			"2bqkbnr/4pppp/8/8/8/3N1N2/P1PP1PPP/RqBQK2R w KQkq - 0 1",
			"2bqkbnr/4pppp/8/8/8/3N1N2/P1PP1PPP/RqBQ1RK1 b kq - 1 1",
			WKing, PieceNone, NewMove(SG1, SE1, MoveCastling),
		},
		{
			"black O-O-O",
			"r3kbnr/4pppp/8/8/8/3N1N2/P1PP1PPP/RqBQ1RK1 b KQkq - 0 1",
			"2kr1bnr/4pppp/8/8/8/3N1N2/P1PP1PPP/RqBQ1RK1 w KQ - 1 2",
			BKing, PieceNone, NewMove(SC8, SE8, MoveCastling),
		},
		{
			"white rook",
			"r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1",
			"r3k2r/8/8/8/8/8/8/1R2K2R b Kkq - 1 1",
			WRook, PieceNone, NewMove(SB1, SA1, MoveNormal),
		},
		{
			"black rook",
			"r3k2r/8/8/8/8/8/8/1R2K2R b Kkq - 1 1",
			"r3k1r1/8/8/8/8/8/8/1R2K2R w Kq - 2 2",
			BRook, PieceNone, NewMove(SG8, SH8, MoveNormal),
		},
		{
			"white double pawn push",
			"4k3/4p3/8/8/8/8/4P3/4K3 w - - 0 1",
			"4k3/4p3/8/8/4P3/8/8/4K3 b - e3 0 1",
			WPawn, PieceNone, NewMove(SE4, SE2, MoveNormal),
		},
		{
			"black double pawn push",
			"4k3/4p3/8/8/4P3/8/8/4K3 b - e3 0 1",
			"4k3/8/8/4p3/4P3/8/8/4K3 w - e6 0 2",
			BPawn, PieceNone, NewMove(SE5, SE7, MoveNormal),
		},
	}

	for _, tc := range cases {
		pos := ParseFen(tc.fenStr)
		pos.MakeMove(tc.move, tc.moved, tc.captured)

		got := SerializeFen(pos)
		if got != tc.expected {
			t.Fatalf("test \"%s\" failed: expected %s got %s", tc.name, tc.expected, got)
		}
	}
}

func TestIsInsufficientMaterial(t *testing.T) {
	cases := []struct {
		fen      string
		expected bool
	}{
		{"3k1n2/8/8/8/8/5B2/4K3/8", false},
		{"3k4/8/8/8/8/8/4K3/8", true},
		{"3k4/8/8/8/8/5P2/4K3/8", false},
		{"3k4/2b5/8/8/8/8/4K3/8", true},
		{"3k4/8/8/8/8/8/3NK3/8", true},
		{"3k4/2b5/8/8/8/4B3/4K3/8", true},
		{"3k4/2b5/8/8/8/3B4/4K3/8", false},
		{"8/8/8/8/8/8/1n6/KN6", true},
	}

	p := &Position{}
	for _, tc := range cases {
		p.Bitboards = ParseBitboards(tc.fen)

		got := p.IsInsufficientMaterial()
		if got != tc.expected {
			t.Fatalf("expected: %t, got: %t", tc.expected, got)
		}
	}
}

func BenchmarkMakeMove(b *testing.B) {
	before := ParseFen("rnbqkbnr/pppppppp/8/8/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 1")

	for b.Loop() {
		pos := before
		pos.MakeMove(NewMove(SG1, SE1, MoveCastling), WKing, PieceNone)
	}
}

func BenchmarkIsInsufficientMaterial(b *testing.B) {
	p := &Position{
		Bitboards: ParseBitboards("3k1n2/8/8/8/8/5B2/4K3/8"),
	}

	for b.Loop() {
		p.IsInsufficientMaterial()
	}
}

func BenchmarkZobristKey(b *testing.B) {
	p := ParseFen("rnbqkbnr/pppppppp/8/8/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 0 1")

	for b.Loop() {
		p.ZobristKey()
	}
}