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standard_test.go
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standard_test.go
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package rules
import (
"fmt"
"math"
"math/rand"
"testing"
"github.com/stretchr/testify/require"
)
func getStandardRuleset(settings Settings) Ruleset {
return NewRulesetBuilder().WithSettings(settings).NamedRuleset(GameTypeStandard)
}
func TestSanity(t *testing.T) {
r := getStandardRuleset(Settings{})
state, err := CreateDefaultBoardState(MaxRand, 0, 0, []string{})
require.NoError(t, err)
require.NotNil(t, state)
gameOver, state, err := r.Execute(state, []SnakeMove{})
require.NoError(t, err)
require.True(t, gameOver)
require.NotNil(t, state)
require.Equal(t, 0, state.Width)
require.Equal(t, 0, state.Height)
require.Len(t, state.Food, 0)
require.Len(t, state.Snakes, 0)
}
func TestStandardName(t *testing.T) {
r := getStandardRuleset(Settings{})
require.Equal(t, "standard", r.Name())
}
// Checks that the error for a snake missing a move is returned
var standardCaseErrNoMoveFound = gameTestCase{
"Standard Case Error No Move Found",
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}, {X: 1, Y: 2}},
Health: 100,
},
{
ID: "two",
Body: []Point{{X: 3, Y: 4}, {X: 3, Y: 3}},
Health: 100,
},
},
Food: []Point{{X: 0, Y: 0}, {X: 1, Y: 0}},
Hazards: []Point{},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
},
ErrorNoMoveFound,
nil,
}
// Checks that the error for a snake with no points is returned
var standardCaseErrZeroLengthSnake = gameTestCase{
"Standard Case Error Zero Length Snake",
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}, {X: 1, Y: 2}},
Health: 100,
},
{
ID: "two",
Body: []Point{},
Health: 100,
},
},
Food: []Point{{X: 0, Y: 0}, {X: 1, Y: 0}},
Hazards: []Point{},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
ErrorZeroLengthSnake,
nil,
}
// Checks a basic state where a snake moves, eats and grows
var standardCaseMoveEatAndGrow = gameTestCase{
"Standard Case Move Eat and Grow",
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}, {X: 1, Y: 2}},
Health: 100,
},
{
ID: "two",
Body: []Point{{X: 3, Y: 4}, {X: 3, Y: 3}},
Health: 100,
},
{
ID: "three",
Body: []Point{},
Health: 100,
EliminatedCause: EliminatedByOutOfBounds,
},
},
Food: []Point{{X: 0, Y: 0}, {X: 1, Y: 0}},
Hazards: []Point{},
},
[]SnakeMove{
{ID: "one", Move: MoveDown},
{ID: "two", Move: MoveUp},
{ID: "three", Move: MoveLeft}, // Should be ignored
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 0}, {X: 1, Y: 1}, {X: 1, Y: 1}},
Health: 100,
},
{
ID: "two",
Body: []Point{{X: 3, Y: 5}, {X: 3, Y: 4}},
Health: 99,
},
{
ID: "three",
Body: []Point{},
Health: 100,
EliminatedCause: EliminatedByOutOfBounds,
},
},
Food: []Point{{X: 0, Y: 0}},
Hazards: []Point{},
},
}
// Checks a basic state where two snakes of equal sizes collide, and both should
// be eliminated as a result.
var standardMoveAndCollideMAD = gameTestCase{
"Standard Case Move and Collide",
&BoardState{
Turn: 0,
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}, {X: 2, Y: 1}},
Health: 99,
},
{
ID: "two",
Body: []Point{{X: 1, Y: 2}, {X: 2, Y: 2}},
Health: 99,
},
},
Food: []Point{},
Hazards: []Point{},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 2}, {X: 1, Y: 1}},
Health: 98,
EliminatedCause: EliminatedByCollision,
EliminatedBy: "two",
EliminatedOnTurn: 1,
},
{
ID: "two",
Body: []Point{{X: 1, Y: 1}, {X: 1, Y: 2}},
Health: 98,
EliminatedCause: EliminatedByCollision,
EliminatedBy: "one",
EliminatedOnTurn: 1,
},
},
Food: []Point{},
Hazards: []Point{},
},
}
func TestStandardCreateNextBoardState(t *testing.T) {
cases := []gameTestCase{
standardCaseErrNoMoveFound,
standardCaseErrZeroLengthSnake,
standardCaseMoveEatAndGrow,
standardMoveAndCollideMAD,
}
r := getStandardRuleset(Settings{})
for _, gc := range cases {
// test a RulesBuilder constructed instance
gc.requireValidNextState(t, r)
// also test a pipeline with the same settings
gc.requireValidNextState(t, NewRulesetBuilder().PipelineRuleset(GameTypeStandard, NewPipeline(standardRulesetStages...)))
}
}
func TestEatingOnLastMove(t *testing.T) {
// We want to specifically ensure that snakes eating food on their last turn
// survive. It used to be that this wasn't the case, and snakes were eliminated
// if they moved onto food with their final move. This behaviour wasn't "wrong" or incorrect,
// it just was less fun to watch. So let's ensure we're always giving snakes every possible
// changes to reach food before eliminating them.
tests := []struct {
prevState *BoardState
moves []SnakeMove
expectedError error
expectedState *BoardState
}{
{
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 0}},
Health: 1,
},
{
ID: "two",
Body: []Point{{X: 3, Y: 2}, {X: 3, Y: 3}, {X: 3, Y: 4}},
Health: 1,
},
},
Food: []Point{{X: 0, Y: 3}, {X: 9, Y: 9}},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 1}},
Health: 100,
},
{
ID: "two",
Body: []Point{{X: 3, Y: 1}, {X: 3, Y: 2}, {X: 3, Y: 3}},
Health: 0,
EliminatedCause: EliminatedByOutOfHealth,
EliminatedOnTurn: 1,
},
},
Food: []Point{{X: 9, Y: 9}},
},
},
}
rand.Seed(0) // Seed with a value that will reliably not spawn food
r := getStandardRuleset(Settings{})
for _, test := range tests {
_, nextState, err := r.Execute(test.prevState, test.moves)
require.Equal(t, err, test.expectedError)
if test.expectedState != nil {
require.Equal(t, test.expectedState.Width, nextState.Width)
require.Equal(t, test.expectedState.Height, nextState.Height)
require.Equal(t, test.expectedState.Food, nextState.Food)
require.Equal(t, test.expectedState.Snakes, nextState.Snakes)
}
}
}
func TestHeadToHeadOnFood(t *testing.T) {
// We want to specifically ensure that snakes that collide head-to-head
// on top of food successfully remove the food - that's the core behaviour this test
// is enforcing. There's a known side effect of this though, in that both snakes will
// have eaten prior to being evaluated on the head-to-head (+1 length, full health).
// We're okay with that since it does not impact the result of the head-to-head,
// however that behaviour could change in the future and this test could be updated.
tests := []struct {
prevState *BoardState
moves []SnakeMove
expectedError error
expectedState *BoardState
}{
{
&BoardState{
Turn: 41,
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 0}},
Health: 10,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}},
Health: 10,
},
},
Food: []Point{{X: 0, Y: 3}, {X: 9, Y: 9}},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 1}},
Health: 100,
EliminatedCause: EliminatedByHeadToHeadCollision,
EliminatedBy: "two",
EliminatedOnTurn: 42,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 5}},
Health: 100,
EliminatedCause: EliminatedByHeadToHeadCollision,
EliminatedBy: "one",
EliminatedOnTurn: 42,
},
},
Food: []Point{{X: 9, Y: 9}},
},
},
{
&BoardState{
Turn: 41,
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 0}},
Health: 10,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}, {X: 0, Y: 7}},
Health: 10,
},
},
Food: []Point{{X: 0, Y: 3}, {X: 9, Y: 9}},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 1}},
Health: 100,
EliminatedCause: EliminatedByHeadToHeadCollision,
EliminatedBy: "two",
EliminatedOnTurn: 42,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}, {X: 0, Y: 6}},
Health: 100,
},
},
Food: []Point{{X: 9, Y: 9}},
},
},
}
rand.Seed(0) // Seed with a value that will reliably not spawn food
r := getStandardRuleset(Settings{})
for _, test := range tests {
_, nextState, err := r.Execute(test.prevState, test.moves)
require.Equal(t, test.expectedError, err)
if test.expectedState != nil {
require.Equal(t, test.expectedState.Width, nextState.Width)
require.Equal(t, test.expectedState.Height, nextState.Height)
require.Equal(t, test.expectedState.Food, nextState.Food)
require.Equal(t, test.expectedState.Snakes, nextState.Snakes)
}
}
}
func TestRegressionIssue19(t *testing.T) {
// Eliminated snakes passed to CreateNextBoardState should not impact next game state
tests := []struct {
prevState *BoardState
moves []SnakeMove
expectedError error
expectedState *BoardState
}{
{
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 2}, {X: 0, Y: 1}, {X: 0, Y: 0}},
Health: 100,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 5}, {X: 0, Y: 6}, {X: 0, Y: 7}},
Health: 100,
},
{
ID: "eliminated",
Body: []Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 0, Y: 2}, {X: 0, Y: 3}, {X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}},
Health: 0,
EliminatedCause: EliminatedByOutOfHealth,
},
},
Food: []Point{{X: 9, Y: 9}},
},
[]SnakeMove{
{ID: "one", Move: MoveUp},
{ID: "two", Move: MoveDown},
},
nil,
&BoardState{
Width: 10,
Height: 10,
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 0, Y: 3}, {X: 0, Y: 2}, {X: 0, Y: 1}},
Health: 99,
},
{
ID: "two",
Body: []Point{{X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}},
Health: 99,
},
{
ID: "eliminated",
Body: []Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 0, Y: 2}, {X: 0, Y: 3}, {X: 0, Y: 4}, {X: 0, Y: 5}, {X: 0, Y: 6}},
Health: 0,
EliminatedCause: EliminatedByOutOfHealth,
},
},
Food: []Point{{X: 9, Y: 9}},
},
},
}
rand.Seed(0) // Seed with a value that will reliably not spawn food
r := getStandardRuleset(Settings{})
for _, test := range tests {
_, nextState, err := r.Execute(test.prevState, test.moves)
require.Equal(t, err, test.expectedError)
if test.expectedState != nil {
require.Equal(t, test.expectedState.Width, nextState.Width)
require.Equal(t, test.expectedState.Height, nextState.Height)
require.Equal(t, test.expectedState.Food, nextState.Food)
require.Equal(t, test.expectedState.Snakes, nextState.Snakes)
}
}
}
func TestMoveSnakes(t *testing.T) {
b := &BoardState{
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 10, Y: 110}, {X: 11, Y: 110}},
Health: 111111,
},
{
ID: "two",
Body: []Point{{X: 23, Y: 220}, {X: 22, Y: 220}, {X: 21, Y: 220}, {X: 20, Y: 220}},
Health: 222222,
},
{
ID: "three",
Body: []Point{{X: 0, Y: 0}},
Health: 1,
EliminatedCause: EliminatedByOutOfBounds,
},
},
}
tests := []struct {
MoveOne string
ExpectedOne []Point
MoveTwo string
ExpectedTwo []Point
MoveThree string
ExpectedThree []Point
}{
{
MoveDown, []Point{{X: 10, Y: 109}, {X: 10, Y: 110}},
MoveUp, []Point{{X: 23, Y: 221}, {X: 23, Y: 220}, {X: 22, Y: 220}, {X: 21, Y: 220}},
MoveDown, []Point{{X: 0, Y: 0}},
},
{
MoveRight, []Point{{X: 11, Y: 109}, {X: 10, Y: 109}},
MoveLeft, []Point{{X: 22, Y: 221}, {X: 23, Y: 221}, {X: 23, Y: 220}, {X: 22, Y: 220}},
MoveDown, []Point{{X: 0, Y: 0}},
},
{
MoveRight, []Point{{X: 12, Y: 109}, {X: 11, Y: 109}},
MoveLeft, []Point{{X: 21, Y: 221}, {X: 22, Y: 221}, {X: 23, Y: 221}, {X: 23, Y: 220}},
MoveDown, []Point{{X: 0, Y: 0}},
},
{
MoveRight, []Point{{X: 13, Y: 109}, {X: 12, Y: 109}},
MoveLeft, []Point{{X: 20, Y: 221}, {X: 21, Y: 221}, {X: 22, Y: 221}, {X: 23, Y: 221}},
MoveDown, []Point{{X: 0, Y: 0}},
},
{
MoveDown, []Point{{X: 13, Y: 108}, {X: 13, Y: 109}},
MoveUp, []Point{{X: 20, Y: 222}, {X: 20, Y: 221}, {X: 21, Y: 221}, {X: 22, Y: 221}},
MoveDown, []Point{{X: 0, Y: 0}},
},
}
r := getStandardRuleset(Settings{})
for _, test := range tests {
moves := []SnakeMove{
{ID: "one", Move: test.MoveOne},
{ID: "two", Move: test.MoveTwo},
{ID: "three", Move: test.MoveThree},
}
_, err := MoveSnakesStandard(b, r.Settings(), moves)
require.NoError(t, err)
require.Len(t, b.Snakes, 3)
require.Equal(t, 111111, b.Snakes[0].Health)
require.Equal(t, 222222, b.Snakes[1].Health)
require.Equal(t, 1, b.Snakes[2].Health)
require.Len(t, b.Snakes[0].Body, 2)
require.Len(t, b.Snakes[1].Body, 4)
require.Len(t, b.Snakes[2].Body, 1)
require.Equal(t, len(b.Snakes[0].Body), len(test.ExpectedOne))
for i, e := range test.ExpectedOne {
require.Equal(t, e, b.Snakes[0].Body[i])
}
require.Equal(t, len(b.Snakes[1].Body), len(test.ExpectedTwo))
for i, e := range test.ExpectedTwo {
require.Equal(t, e, b.Snakes[1].Body[i])
}
require.Equal(t, len(b.Snakes[2].Body), len(test.ExpectedThree))
for i, e := range test.ExpectedThree {
require.Equal(t, e, b.Snakes[2].Body[i])
}
}
}
func TestMoveSnakesWrongID(t *testing.T) {
b := &BoardState{
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}},
},
},
}
moves := []SnakeMove{
{
ID: "not found",
Move: MoveUp,
},
}
r := getStandardRuleset(Settings{})
_, err := MoveSnakesStandard(b, r.Settings(), moves)
require.Equal(t, ErrorNoMoveFound, err)
}
func TestMoveSnakesNotEnoughMoves(t *testing.T) {
b := &BoardState{
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}},
},
{
ID: "two",
Body: []Point{{X: 2, Y: 2}},
},
},
}
moves := []SnakeMove{
{
ID: "two",
Move: MoveUp,
},
}
r := getStandardRuleset(Settings{})
_, err := MoveSnakesStandard(b, r.Settings(), moves)
require.Equal(t, ErrorNoMoveFound, err)
}
func TestMoveSnakesExtraMovesIgnored(t *testing.T) {
b := &BoardState{
Snakes: []Snake{
{
ID: "one",
Body: []Point{{X: 1, Y: 1}},
},
},
}
moves := []SnakeMove{
{
ID: "one",
Move: MoveDown,
},
{
ID: "two",
Move: MoveLeft,
},
}
r := getStandardRuleset(Settings{})
_, err := MoveSnakesStandard(b, r.Settings(), moves)
require.NoError(t, err)
require.Equal(t, []Point{{X: 1, Y: 0}}, b.Snakes[0].Body)
}
func TestMoveSnakesDefault(t *testing.T) {
tests := []struct {
Body []Point
Move string
Expected []Point
}{
{
Body: []Point{{X: 0, Y: 0}},
Move: "invalid",
Expected: []Point{{X: 0, Y: 1}},
},
{
Body: []Point{{X: 5, Y: 5}, {X: 5, Y: 5}},
Move: "",
Expected: []Point{{X: 5, Y: 6}, {X: 5, Y: 5}},
},
{
Body: []Point{{X: 5, Y: 5}, {X: 5, Y: 4}},
Expected: []Point{{X: 5, Y: 6}, {X: 5, Y: 5}},
},
{
Body: []Point{{X: 5, Y: 4}, {X: 5, Y: 5}},
Expected: []Point{{X: 5, Y: 3}, {X: 5, Y: 4}},
},
{
Body: []Point{{X: 5, Y: 4}, {X: 5, Y: 5}},
Expected: []Point{{X: 5, Y: 3}, {X: 5, Y: 4}},
},
{
Body: []Point{{X: 4, Y: 5}, {X: 5, Y: 5}},
Expected: []Point{{X: 3, Y: 5}, {X: 4, Y: 5}},
},
{
Body: []Point{{X: 5, Y: 5}, {X: 4, Y: 5}},
Expected: []Point{{X: 6, Y: 5}, {X: 5, Y: 5}},
},
}
r := getStandardRuleset(Settings{})
for _, test := range tests {
b := &BoardState{
Snakes: []Snake{
{ID: "one", Body: test.Body},
},
}
moves := []SnakeMove{{ID: "one", Move: test.Move}}
_, err := MoveSnakesStandard(b, r.Settings(), moves)
require.NoError(t, err)
require.Len(t, b.Snakes, 1)
require.Equal(t, len(test.Body), len(b.Snakes[0].Body))
require.Equal(t, len(test.Expected), len(b.Snakes[0].Body))
for i, e := range test.Expected {
require.Equal(t, e, b.Snakes[0].Body[i])
}
}
}
func TestGetDefaultMove(t *testing.T) {
tests := []struct {
SnakeBody []Point
ExpectedMove string
}{
// Default is always up
{
SnakeBody: []Point{},
ExpectedMove: MoveUp,
},
{
SnakeBody: []Point{{X: 0, Y: 0}},
ExpectedMove: MoveUp,
},
{
SnakeBody: []Point{{X: -1, Y: -1}},
ExpectedMove: MoveUp,
},
// Stacked (fallback to default)
{
SnakeBody: []Point{{X: 2, Y: 2}, {X: 2, Y: 2}},
ExpectedMove: MoveUp,
},
// Neck next to head
{
SnakeBody: []Point{{X: 2, Y: 2}, {X: 2, Y: 1}},
ExpectedMove: MoveUp,
},
{
SnakeBody: []Point{{X: 2, Y: 2}, {X: 2, Y: 3}},
ExpectedMove: MoveDown,
},
{
SnakeBody: []Point{{X: 2, Y: 2}, {X: 1, Y: 2}},
ExpectedMove: MoveRight,
},
{
SnakeBody: []Point{{X: 2, Y: 2}, {X: 3, Y: 2}},
ExpectedMove: MoveLeft,
},
// Board wrap cases
{
SnakeBody: []Point{{X: 0, Y: 0}, {X: 0, Y: 2}},
ExpectedMove: MoveUp,
},
{
SnakeBody: []Point{{X: 0, Y: 0}, {X: 2, Y: 0}},
ExpectedMove: MoveRight,
},
{
SnakeBody: []Point{{X: 0, Y: 2}, {X: 0, Y: 0}},
ExpectedMove: MoveDown,
},
{
SnakeBody: []Point{{X: 2, Y: 0}, {X: 0, Y: 0}},
ExpectedMove: MoveLeft,
},
}
for _, test := range tests {
actualMove := getDefaultMove(test.SnakeBody)
require.Equal(t, test.ExpectedMove, actualMove)
}
}
func TestReduceSnakeHealth(t *testing.T) {
b := &BoardState{
Snakes: []Snake{
{
Body: []Point{{X: 0, Y: 0}, {X: 0, Y: 1}},
Health: 99,
},
{
Body: []Point{{X: 5, Y: 8}, {X: 6, Y: 8}, {X: 7, Y: 8}},
Health: 2,
},
{
Body: []Point{{X: 0, Y: 0}, {X: 0, Y: 1}},
Health: 50,
EliminatedCause: EliminatedByCollision,
},
},
}
r := getStandardRuleset(Settings{})
_, err := ReduceSnakeHealthStandard(b, r.Settings(), mockSnakeMoves())
require.NoError(t, err)
require.Equal(t, b.Snakes[0].Health, 98)
require.Equal(t, b.Snakes[1].Health, 1)
require.Equal(t, b.Snakes[2].Health, 50)
_, err = ReduceSnakeHealthStandard(b, r.Settings(), mockSnakeMoves())
require.NoError(t, err)
require.Equal(t, b.Snakes[0].Health, 97)
require.Equal(t, b.Snakes[1].Health, 0)
require.Equal(t, b.Snakes[2].Health, 50)
_, err = ReduceSnakeHealthStandard(b, r.Settings(), mockSnakeMoves())
require.NoError(t, err)
require.Equal(t, b.Snakes[0].Health, 96)
require.Equal(t, b.Snakes[1].Health, -1)
require.Equal(t, b.Snakes[2].Health, 50)
_, err = ReduceSnakeHealthStandard(b, r.Settings(), mockSnakeMoves())
require.NoError(t, err)
require.Equal(t, b.Snakes[0].Health, 95)
require.Equal(t, b.Snakes[1].Health, -2)
require.Equal(t, b.Snakes[2].Health, 50)
}
func TestSnakeIsOutOfHealth(t *testing.T) {
tests := []struct {
Health int
Expected bool
}{
{Health: math.MinInt, Expected: true},
{Health: -10, Expected: true},
{Health: -2, Expected: true},
{Health: -1, Expected: true},
{Health: 0, Expected: true},
{Health: 1, Expected: false},
{Health: 2, Expected: false},
{Health: 10, Expected: false},
{Health: math.MaxInt, Expected: false},
}
for _, test := range tests {
s := &Snake{Health: test.Health}
require.Equal(t, test.Expected, snakeIsOutOfHealth(s), "Health: %+v", test.Health)
}
}
func TestSnakeIsOutOfBounds(t *testing.T) {
boardWidth := 10
boardHeight := 100
tests := []struct {
Point Point
Expected bool
}{
{Point{X: math.MinInt, Y: math.MinInt}, true},
{Point{X: math.MinInt, Y: 0}, true},
{Point{X: 0, Y: math.MinInt}, true},
{Point{X: -1, Y: -1}, true},
{Point{X: -1, Y: 0}, true},
{Point{X: 0, Y: -1}, true},
{Point{X: 0, Y: 0}, false},
{Point{X: 1, Y: 0}, false},
{Point{X: 0, Y: 1}, false},
{Point{X: 1, Y: 1}, false},
{Point{X: 9, Y: 9}, false},
{Point{X: 9, Y: 10}, false},
{Point{X: 9, Y: 11}, false},
{Point{X: 10, Y: 9}, true},
{Point{X: 10, Y: 10}, true},
{Point{X: 10, Y: 11}, true},
{Point{X: 11, Y: 9}, true},
{Point{X: 11, Y: 10}, true},
{Point{X: 11, Y: 11}, true},
{Point{X: math.MaxInt, Y: 11}, true},
{Point{X: 9, Y: 99}, false},
{Point{X: 9, Y: 100}, true},
{Point{X: 9, Y: 101}, true},
{Point{X: 9, Y: math.MaxInt}, true},
{Point{X: math.MaxInt, Y: math.MaxInt}, true},
}
for _, test := range tests {
// Test with point as head
s := Snake{Body: []Point{test.Point}}
require.Equal(t, test.Expected, snakeIsOutOfBounds(&s, boardWidth, boardHeight), "Head%+v", test.Point)
// Test with point as body
s = Snake{Body: []Point{{X: 0, Y: 0}, {X: 0, Y: 0}, test.Point}}
require.Equal(t, test.Expected, snakeIsOutOfBounds(&s, boardWidth, boardHeight), "Body%+v", test.Point)
}
}
func TestSnakeHasBodyCollidedSelf(t *testing.T) {
tests := []struct {
Body []Point
Expected bool
}{
{[]Point{{X: 1, Y: 1}}, false},
// Self stacks should self collide
// (we rely on snakes moving before we check self-collision on turn one)
{[]Point{{X: 2, Y: 2}, {X: 2, Y: 2}}, true},
{[]Point{{X: 3, Y: 3}, {X: 3, Y: 3}, {X: 3, Y: 3}}, true},
{[]Point{{X: 5, Y: 5}, {X: 5, Y: 5}, {X: 5, Y: 5}, {X: 5, Y: 5}, {X: 5, Y: 5}}, true},
// Non-collision cases
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 1, Y: 0}}, false},
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}}, false},
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}, {X: 2, Y: 0}, {X: 2, Y: 0}}, false},
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}, {X: 3, Y: 0}, {X: 4, Y: 0}}, false},
{[]Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 0, Y: 2}}, false},
{[]Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 0, Y: 2}, {X: 0, Y: 2}, {X: 0, Y: 2}}, false},
{[]Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 0, Y: 2}, {X: 0, Y: 3}, {X: 0, Y: 4}}, false},
// Collision cases
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 0, Y: 0}}, true},
{[]Point{{X: 0, Y: 0}, {X: 0, Y: 0}, {X: 1, Y: 0}}, true},
{[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 1, Y: 1}, {X: 0, Y: 1}, {X: 0, Y: 0}}, true},
{[]Point{{X: 4, Y: 4}, {X: 3, Y: 4}, {X: 3, Y: 3}, {X: 4, Y: 4}, {X: 4, Y: 4}}, true},
{[]Point{{X: 3, Y: 3}, {X: 3, Y: 4}, {X: 3, Y: 3}, {X: 4, Y: 4}, {X: 4, Y: 5}}, true},
}
for _, test := range tests {
s := Snake{Body: test.Body}
require.Equal(t, test.Expected, snakeHasBodyCollided(&s, &s), "Body%q", s.Body)
}
}
func TestSnakeHasBodyCollidedOther(t *testing.T) {
tests := []struct {
SnakeBody []Point
OtherBody []Point
Expected bool
}{
{
// Just heads
[]Point{{X: 0, Y: 0}},
[]Point{{X: 1, Y: 1}},
false,
},
{
// Head-to-heads are not considered in body collisions
[]Point{{X: 0, Y: 0}},
[]Point{{X: 0, Y: 0}},
false,
},
{
// Stacked bodies
[]Point{{X: 0, Y: 0}},
[]Point{{X: 0, Y: 0}, {X: 0, Y: 0}},
true,
},
{
// Separate stacked bodies
[]Point{{X: 0, Y: 0}, {X: 0, Y: 0}, {X: 0, Y: 0}},
[]Point{{X: 1, Y: 1}, {X: 1, Y: 1}, {X: 1, Y: 1}},
false,
},
{
// Stacked bodies, separated heads
[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 1, Y: 0}},
[]Point{{X: 2, Y: 0}, {X: 1, Y: 0}, {X: 1, Y: 0}},
false,
},
{
// Mid-snake collision
[]Point{{X: 1, Y: 1}},
[]Point{{X: 0, Y: 1}, {X: 1, Y: 1}, {X: 2, Y: 1}},
true,
},
}
for _, test := range tests {
s := &Snake{Body: test.SnakeBody}
o := &Snake{Body: test.OtherBody}
require.Equal(t, test.Expected, snakeHasBodyCollided(s, o), "Snake%q Other%q", s.Body, o.Body)
}
}
func TestSnakeHasLostHeadToHead(t *testing.T) {
tests := []struct {
SnakeBody []Point
OtherBody []Point
Expected bool
ExpectedOpposite bool
}{
{
// Just heads
[]Point{{X: 0, Y: 0}},
[]Point{{X: 1, Y: 1}},
false, false,
},
{
// Just heads colliding
[]Point{{X: 0, Y: 0}},
[]Point{{X: 0, Y: 0}},
true, true,
},
{
// One snake larger
[]Point{{X: 0, Y: 0}, {X: 1, Y: 0}, {X: 2, Y: 0}},
[]Point{{X: 0, Y: 0}},