Battlesnake/Byte-snake-engine
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Restrict fixed food spawns to only locations further from center.

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This commit is contained in:
bvanvugt 2022-01-18 20:21:21 +00:00
parent 020303a8dd
commit 4df2c65432
2 changed files with 88 additions and 33 deletions
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46
board_test.go
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@ -2,6 +2,7 @@ package rules
import (
"fmt"
"sort"
"testing"
"github.com/stretchr/testify/require"
@ -390,6 +391,8 @@ func TestPlaceFoodFixed(t *testing.T) {
require.NoError(t, err)
require.Equal(t, len(test.BoardState.Snakes)+1, len(test.BoardState.Food))
midPoint := Point{(test.BoardState.Width - 1) / 2, (test.BoardState.Height - 1) / 2}
// Make sure every snake has food within 2 moves of it
for _, snake := range test.BoardState.Snakes {
head := snake.Body[0]
@ -403,6 +406,8 @@ func TestPlaceFoodFixed(t *testing.T) {
for _, food := range test.BoardState.Food {
if food == bottomLeft || food == topLeft || food == bottomRight || food == topRight {
foundFoodInTwoMoves = true
// Ensure it's not closer to the center than snake
require.True(t, getDistanceBetweenPoints(head, midPoint) <= getDistanceBetweenPoints(food, midPoint))
break
}
}
@ -411,7 +416,6 @@ func TestPlaceFoodFixed(t *testing.T) {
// Make sure one food exists in center of board
foundFoodInCenter := false
midPoint := Point{(test.BoardState.Width - 1) / 2, (test.BoardState.Height - 1) / 2}
for _, food := range test.BoardState.Food {
if food == midPoint {
foundFoodInCenter = true
@ -442,6 +446,9 @@ func TestPlaceFoodFixedNoRoom(t *testing.T) {
},
Food: []Point{},
}
// There are 3 possible spawn locations: {0, 0}, {0, 2}, {2, 0}
// So repeat calls to place food should fail after 3 successes
err = PlaceFoodFixed(boardState)
require.NoError(t, err)
boardState.Food = boardState.Food[:len(boardState.Food)-1] // Center food
@ -457,14 +464,41 @@ func TestPlaceFoodFixedNoRoom(t *testing.T) {
boardState.Food = boardState.Food[:len(boardState.Food)-1] // Center food
require.Equal(t, 3, len(boardState.Food))
err = PlaceFoodFixed(boardState)
require.NoError(t, err)
boardState.Food = boardState.Food[:len(boardState.Food)-1] // Center food
require.Equal(t, 4, len(boardState.Food))
// And now there should be no more room.
err = PlaceFoodFixed(boardState)
require.Error(t, err)
expectedFood := []Point{{0, 0}, {0, 2}, {2, 0}}
sort.Slice(boardState.Food, func(i, j int) bool {
if boardState.Food[i].X != boardState.Food[j].X {
return boardState.Food[i].X < boardState.Food[j].X
}
return boardState.Food[i].Y < boardState.Food[j].Y
})
require.Equal(t, expectedFood, boardState.Food)
}
func TestGetDistanceBetweenPoints(t *testing.T) {
tests := []struct {
A Point
B Point
Expected int32
}{
{Point{0, 0}, Point{0, 0}, 0},
{Point{0, 0}, Point{1, 0}, 1},
{Point{0, 0}, Point{0, 1}, 1},
{Point{0, 0}, Point{1, 1}, 2},
{Point{0, 0}, Point{4, 4}, 8},
{Point{0, 0}, Point{4, 6}, 10},
{Point{8, 0}, Point{8, 0}, 0},
{Point{8, 0}, Point{8, 8}, 8},
{Point{8, 0}, Point{0, 8}, 16},
}
for _, test := range tests {
require.Equal(t, getDistanceBetweenPoints(test.A, test.B), test.Expected)
require.Equal(t, getDistanceBetweenPoints(test.B, test.A), test.Expected)
}
}
func TestIsKnownBoardSize(t *testing.T) {