mchess-server/chess/rook_test.go

package chess

import (
	"mchess_server/types"
	"testing"

	"github.com/samber/lo"
	"github.com/stretchr/testify/assert"
)

func Test_Rook_GetNonBlockedSquares(t *testing.T) {
	t.Run("free row and column", func(t *testing.T) {
		board := newBoard()
		rook := Rook{Color: types.Black}

		board.position[types.Coordinate{Col: 5, Row: 5}] = rook
		squares := rook.GetAllNonBlockedMoves(board, types.Coordinate{Col: 5, Row: 5})
		assert.Len(t, squares, 14)
	})

	t.Run("free row and column", func(t *testing.T) {
		board := newBoard()
		rook := Rook{Color: types.Black}
		rookCoordinate := types.Coordinate{Col: 5, Row: 5}

		board.position[rookCoordinate] = rook
		board.position[types.Coordinate{Col: 3, Row: 5}] = Pawn{Color: types.White}
		board.position[types.Coordinate{Col: 5, Row: 6}] = Pawn{Color: types.White}
		board.position[types.Coordinate{Col: 6, Row: 5}] = Pawn{Color: types.Black}

		squares := rook.GetAllNonBlockedMoves(board, rookCoordinate)

		squaresOnLeft := lo.Filter(squares, func(square types.Coordinate, _ int) bool {
			return square.Row == rookCoordinate.Row && square.Col < rookCoordinate.Col
		})
		assert.Equal(t,
			[]types.Coordinate{
				{Col: 4, Row: 5},
				{Col: 3, Row: 5},
			},
			squaresOnLeft)

		squaresOnRight := lo.Filter(squares, func(square types.Coordinate, _ int) bool {
			return square.Row == rookCoordinate.Row && square.Col > rookCoordinate.Col
		})
		assert.Equal(t,
			[]types.Coordinate{},
			squaresOnRight)

		squaresAbove := lo.Filter(squares, func(square types.Coordinate, _ int) bool {
			return square.Col == rookCoordinate.Col && square.Row > rookCoordinate.Row
		})
		assert.Equal(t,
			[]types.Coordinate{
				{Col: 5, Row: 6},
			},
			squaresAbove)

		squaresBelow := lo.Filter(squares, func(square types.Coordinate, _ int) bool {
			return square.Col == rookCoordinate.Col && square.Row < rookCoordinate.Row
		})
		assert.Equal(t,
			[]types.Coordinate{
				{Col: 5, Row: 4},
				{Col: 5, Row: 3},
				{Col: 5, Row: 2},
				{Col: 5, Row: 1},
			},
			squaresBelow)
	})
}