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magic_test.go
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magic_test.go
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package main
import (
"fmt"
"math"
"math/bits"
"testing"
"github.com/stretchr/testify/assert"
)
func assertMovePresent(t *testing.T, moves []Move, fromSq byte, toSq byte) {
found := false
for _, move := range moves {
if move.From() == fromSq && move.To() == toSq {
found = true
}
}
assert.True(t, found, fmt.Sprintf("Move from=%d to=%d was not present", fromSq, toSq))
}
func assertMoveNotPresent(t *testing.T, moves []Move, fromSq byte, toSq byte) {
found := false
for _, move := range moves {
if move.From() == fromSq && move.To() == toSq {
found = true
}
}
assert.False(t, found, fmt.Sprintf("Move from=%d to=%d was present", fromSq, toSq))
}
func TestRookMask(t *testing.T) {
assert.Equal(t, uint64(0x8080876080800), RookMask(SQUARE_D4))
assert.Equal(t, 10, bits.OnesCount64(RookMask(SQUARE_D4)))
assert.Equal(t, uint64(0x101010101017e), RookMask(SQUARE_A1))
assert.Equal(t, 12, bits.OnesCount64(RookMask(SQUARE_A1)))
assert.Equal(t, uint64(0x202020202027c), RookMask(SQUARE_B1))
assert.Equal(t, 11, bits.OnesCount64(RookMask(SQUARE_B1)))
assert.Equal(t, uint64(0x7e80808080808000), RookMask(SQUARE_H8))
assert.Equal(t, 12, bits.OnesCount64(RookMask(SQUARE_H8)))
}
func TestBishopMask(t *testing.T) {
assert.Equal(t, uint64(0x40221400142200), BishopMask(SQUARE_D4))
assert.Equal(t, 9, bits.OnesCount64(BishopMask(SQUARE_D4)))
assert.Equal(t, uint64(0x40201008040200), BishopMask(SQUARE_A1))
assert.Equal(t, 6, bits.OnesCount64(BishopMask(SQUARE_A1)))
assert.Equal(t, uint64(0x402010080400), BishopMask(SQUARE_B1))
assert.Equal(t, 5, bits.OnesCount64(BishopMask(SQUARE_B1)))
assert.Equal(t, uint64(0x2040810204000), BishopMask(SQUARE_H1))
assert.Equal(t, 6, bits.OnesCount64(BishopMask(SQUARE_H1)))
assert.Equal(t, uint64(0x4020100a0000), BishopMask(SQUARE_C2))
assert.Equal(t, 5, bits.OnesCount64(BishopMask(SQUARE_C2)))
}
func TestBishopMoveBoard(t *testing.T) {
var occupancies uint64
occupancies = SetBitboard(occupancies, SQUARE_B2)
occupancies = SetBitboard(occupancies, SQUARE_B6)
occupancies = SetBitboard(occupancies, SQUARE_E5)
assert.Equal(t, uint64(0x21400142240), BishopMoveBoard(SQUARE_D4, occupancies))
}
func TestRookOccupancies(t *testing.T) {
assert.Equal(t, 1024, len(GenerateRookOccupancies(SQUARE_D4, false)))
assert.Equal(t, 4096, len(GenerateRookOccupancies(SQUARE_A1, false)))
assert.Equal(t, 4096, len(GenerateRookOccupancies(SQUARE_H1, false)))
assert.Equal(t, 16384, len(GenerateRookOccupancies(SQUARE_D4, true)))
assert.Equal(t, 16384, len(GenerateRookOccupancies(SQUARE_A1, true)))
assert.Equal(t, 16384, len(GenerateRookOccupancies(SQUARE_H1, true)))
}
func TestBishopOccupancies(t *testing.T) {
assert.Equal(t, 64, len(GenerateBishopOccupancies(SQUARE_A1, false)))
assert.Equal(t, 128, len(GenerateBishopOccupancies(SQUARE_A1, true)))
assert.Equal(t, 32, len(GenerateBishopOccupancies(SQUARE_D1, false)))
assert.Equal(t, 128, len(GenerateBishopOccupancies(SQUARE_D1, true)))
}
func TestRookMoveBoard(t *testing.T) {
var occupancies uint64
occupancies = SetBitboard(occupancies, SQUARE_D1)
occupancies = SetBitboard(occupancies, SQUARE_G3)
occupancies = SetBitboard(occupancies, SQUARE_D6)
assert.Equal(t, uint64(0x80808770808), RookMoveBoard(SQUARE_D3, occupancies))
}
func TestGenerateRookSlidingMoves(t *testing.T) {
magics, err := inputMagicFile("rook-magics.json")
if err != nil {
panic(err)
}
attacks := make([]SquareAttacks, math.MaxInt16)
a1Magic := magics[SQUARE_A1]
GenerateRookSlidingMoves(SQUARE_A1, a1Magic, attacks)
var bitboard uint64
bitboard = SetBitboard(bitboard, SQUARE_A5)
bitboard = SetBitboard(bitboard, SQUARE_G1)
key := hashKey(bitboard, a1Magic)
assert.Equal(t, 10, len(attacks[key].moves))
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_A2)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_A3)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_A4)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_A5)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_B1)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_C1)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_D1)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_E1)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_F1)
assertMovePresent(t, attacks[key].moves, SQUARE_A1, SQUARE_G1)
attacks = make([]SquareAttacks, math.MaxInt16)
d3Magic := magics[SQUARE_D3]
GenerateRookSlidingMoves(SQUARE_D3, d3Magic, attacks)
bitboard = 0
bitboard = SetBitboard(bitboard, SQUARE_D2)
key = hashKey(bitboard, d3Magic)
assert.Equal(t, 13, len(attacks[key].moves))
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D2)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D4)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D5)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D6)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D7)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D8)
assertMoveNotPresent(t, attacks[key].moves, SQUARE_D3, SQUARE_D1)
}
func TestGenerateBishopSlidingMoves(t *testing.T) {
magics, err := inputMagicFile("bishop-magics.json")
if err != nil {
panic(err)
}
attacks := make([]SquareAttacks, math.MaxInt16)
d3Magic := magics[SQUARE_D3]
GenerateBishopSlidingMoves(SQUARE_D3, d3Magic, attacks)
var bitboard uint64
bitboard = SetBitboard(bitboard, SQUARE_C2)
bitboard = SetBitboard(bitboard, SQUARE_F1)
bitboard = SetBitboard(bitboard, SQUARE_G6)
key := hashKey(bitboard, d3Magic)
assert.Equal(t, 9, len(attacks[key].moves))
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_E2)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_F1)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_E4)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_F5)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_G6)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_C2)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_C4)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_B5)
assertMovePresent(t, attacks[key].moves, SQUARE_D3, SQUARE_A6)
}