0f44672634
Implements plan §3.9 requirement for INV-6 invariant verification. The test runs thousands of random scenarios across various grid dimensions (30x30 to 200x200) and multiple random seeds to verify that no bot, energy, core, or wall position ever has coordinates outside the valid bounds [0, rows) x [0, cols). Test coverage: - Random wall placement with potentially out-of-bounds input - 1000 random Wrap() calls with positions far outside bounds - Move() operations from edge and corner positions in all directions - Neighbors() and VisibleFrom() return value validation The test uses a manual random-seed loop approach for maximum control and reproducibility, testing 6 grid sizes × 10 seeds for comprehensive coverage of the toroidal wrapping invariant. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
365 lines
9.4 KiB
Go
365 lines
9.4 KiB
Go
package engine
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import (
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"fmt"
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"math/rand"
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"testing"
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)
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func TestGridWrap(t *testing.T) {
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g := NewGrid(60, 60)
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tests := []struct {
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row, col int
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want Position
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}{
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{0, 0, Position{0, 0}},
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{59, 59, Position{59, 59}},
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{60, 0, Position{0, 0}}, // wrap row
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{0, 60, Position{0, 0}}, // wrap col
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{-1, 0, Position{59, 0}}, // negative wrap row
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{0, -1, Position{0, 59}}, // negative wrap col
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{65, 65, Position{5, 5}}, // both wrap
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{-5, -5, Position{55, 55}}, // both negative wrap
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}
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for _, tt := range tests {
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got := g.Wrap(tt.row, tt.col)
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if got != tt.want {
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t.Errorf("Wrap(%d, %d) = %v, want %v", tt.row, tt.col, got, tt.want)
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}
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}
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}
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func TestGridDistance2(t *testing.T) {
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g := NewGrid(60, 60)
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tests := []struct {
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a, b Position
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want int
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}{
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// Direct distances
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{Position{0, 0}, Position{0, 0}, 0},
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{Position{0, 0}, Position{0, 3}, 9},
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{Position{0, 0}, Position{3, 4}, 25}, // 3-4-5 triangle
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{Position{10, 10}, Position{13, 14}, 25},
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// Toroidal wrapping - shorter path across boundary
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{Position{0, 0}, Position{59, 0}, 1}, // distance 1 via wrap
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{Position{0, 0}, Position{58, 0}, 4}, // distance 2 via wrap
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{Position{0, 0}, Position{0, 59}, 1}, // distance 1 via wrap col
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{Position{0, 0}, Position{59, 59}, 2}, // distance sqrt(2) via corner wrap
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}
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for _, tt := range tests {
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got := g.Distance2(tt.a, tt.b)
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if got != tt.want {
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t.Errorf("Distance2(%v, %v) = %d, want %d", tt.a, tt.b, got, tt.want)
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}
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}
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}
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func TestGridInRadius(t *testing.T) {
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g := NewGrid(60, 60)
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// Test vision radius 49 (default ~7 tiles)
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center := Position{30, 30}
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// Should be visible
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visible := []Position{
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{30, 30}, // self
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{30, 31}, // adjacent
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{30, 37}, // 7 tiles away (dist^2 = 49)
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{37, 30}, // 7 tiles away (dist^2 = 49)
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{33, 33}, // diagonal (dist^2 = 18)
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{34, 34}, // diagonal (dist^2 = 32)
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{35, 34}, // dist^2 = 25 + 16 = 41
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}
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for _, p := range visible {
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if !g.InRadius(center, p, 49) {
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t.Errorf("Position %v should be within radius 49 of %v", p, center)
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}
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}
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// Should not be visible
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notVisible := []Position{
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{30, 38}, // 8 tiles away, dist^2 = 64 > 49
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{38, 38}, // diagonal 8*2 = 128 > 49
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}
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for _, p := range notVisible {
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if g.InRadius(center, p, 49) {
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t.Errorf("Position %v should NOT be within radius 49 of %v", p, center)
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}
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}
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}
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func TestGridAttackRadius(t *testing.T) {
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g := NewGrid(60, 60)
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// Attack radius 5 (default ~2.24 tiles)
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center := Position{30, 30}
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// Attack radius includes cardinal, diagonal neighbors, and one more ring
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// dist^2 <= 5 means: 0, 1, 2, 4, 5
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// (1,0) = 1, (1,1) = 2, (2,0) = 4, (2,1) = 5
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inAttack := []Position{
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{30, 30}, // self (dist 0)
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{30, 31}, // cardinal (dist 1)
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{31, 31}, // diagonal (dist 2)
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{32, 30}, // 2 tiles (dist 4)
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{32, 31}, // (dist 5)
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}
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for _, p := range inAttack {
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if !g.InRadius(center, p, 5) {
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t.Errorf("Position %v should be in attack radius of %v", p, center)
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}
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}
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// Outside attack radius
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outAttack := []Position{
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{33, 30}, // 3 tiles (dist 9 > 5)
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{32, 32}, // (dist 8 > 5)
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}
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for _, p := range outAttack {
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if g.InRadius(center, p, 5) {
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t.Errorf("Position %v should NOT be in attack radius of %v", p, center)
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}
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}
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}
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func TestGridWalls(t *testing.T) {
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g := NewGrid(10, 10)
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// Initially no walls
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if g.IsWall(Position{5, 5}) {
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t.Error("Position should not be a wall initially")
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}
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// Set a wall
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g.Set(5, 5, TileWall)
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if !g.IsWall(Position{5, 5}) {
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t.Error("Position should be a wall after setting")
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}
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if g.IsPassable(Position{5, 5}) {
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t.Error("Wall should not be passable")
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}
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// Remove wall
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g.Set(5, 5, TileOpen)
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if g.IsWall(Position{5, 5}) {
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t.Error("Position should not be a wall after clearing")
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}
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}
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func TestGridMove(t *testing.T) {
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g := NewGrid(60, 60)
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tests := []struct {
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start Position
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dir Direction
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want Position
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}{
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{Position{30, 30}, DirN, Position{29, 30}},
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{Position{30, 30}, DirS, Position{31, 30}},
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{Position{30, 30}, DirE, Position{30, 31}},
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{Position{30, 30}, DirW, Position{30, 29}},
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// Wrap at edges
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{Position{0, 0}, DirN, Position{59, 0}},
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{Position{0, 0}, DirW, Position{0, 59}},
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{Position{59, 59}, DirS, Position{0, 59}},
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{Position{59, 59}, DirE, Position{59, 0}},
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}
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for _, tt := range tests {
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got := g.Move(tt.start, tt.dir)
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if got != tt.want {
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t.Errorf("Move(%v, %v) = %v, want %v", tt.start, tt.dir, got, tt.want)
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}
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}
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}
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func TestGridVisibleFrom(t *testing.T) {
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g := NewGrid(60, 60)
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// Single bot at center
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positions := []Position{{30, 30}}
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visible := g.VisibleFrom(positions, 49)
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// Should see positions within radius
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if !visible[Position{30, 30}] {
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t.Error("Should see own position")
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}
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if !visible[Position{30, 37}] {
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t.Error("Should see position 7 tiles away (dist^2 = 49)")
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}
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if visible[Position{30, 38}] {
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t.Error("Should NOT see position 8 tiles away (dist^2 = 64 > 49)")
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}
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// Multiple bots - union of visibility
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positions = []Position{{10, 10}, {50, 50}}
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visible = g.VisibleFrom(positions, 49)
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if !visible[Position{10, 10}] {
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t.Error("Should see first bot position")
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}
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if !visible[Position{50, 50}] {
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t.Error("Should see second bot position")
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}
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if !visible[Position{17, 10}] {
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t.Error("Should see 7 tiles from first bot")
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}
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if !visible[Position{43, 50}] {
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t.Error("Should see 7 tiles from second bot (via wrap)")
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}
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}
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func TestGridRandomPassable(t *testing.T) {
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g := NewGrid(10, 10)
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// Add some walls
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g.Set(5, 5, TileWall)
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g.Set(5, 6, TileWall)
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rng := rand.New(rand.NewSource(42))
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// Get many random positions and verify they're all passable
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for i := 0; i < 100; i++ {
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p := g.RandomPassable(rng)
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if !g.IsPassable(p) {
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t.Errorf("RandomPassable returned impassable position %v", p)
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}
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}
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}
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func TestSqrtApprox(t *testing.T) {
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tests := []struct {
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n int
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want int
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}{
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{0, 0},
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{1, 1},
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{4, 2},
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{9, 3},
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{16, 4},
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{25, 5},
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{49, 7},
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{50, 7}, // sqrt(50) ≈ 7.07
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{100, 10},
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}
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for _, tt := range tests {
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got := sqrtApprox(tt.n)
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if got != tt.want {
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t.Errorf("sqrtApprox(%d) = %d, want %d", tt.n, got, tt.want)
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}
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}
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}
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// TestINV6_ToroidalBounds is a property-based fuzz test that verifies
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// INV-6: No bot, energy, core, or wall position ever has row < 0,
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// row >= rows, col < 0, or col >= cols after any movement operation.
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// All movement must use (pos + delta + size) % size.
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//
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// This test runs thousands of random scenarios with various grid sizes
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// and operations to enforce the bound invariant.
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func TestINV6_ToroidalBounds(t *testing.T) {
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// Test various grid dimensions
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testCases := []struct {
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rows int
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cols int
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}{
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{30, 30}, // Minimum
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{40, 60}, // Rectangular
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{60, 60}, // Standard square
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{100, 100}, // Large
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{120, 80}, // Large rectangular
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{200, 200}, // Maximum
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}
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for _, tc := range testCases {
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t.Run(fmt.Sprintf("%dx%d", tc.rows, tc.cols), func(t *testing.T) {
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// Use multiple random seeds for thoroughness
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seeds := []int64{42, 123, 456, 789, 999, 1337, 2024, 0, -1, 1}
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for _, seed := range seeds {
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t.Run(fmt.Sprintf("seed_%d", seed), func(t *testing.T) {
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rng := rand.New(rand.NewSource(seed))
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testToroidalBoundsScenario(t, rng, tc.rows, tc.cols)
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})
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}
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})
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}
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}
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// testToroidalBoundsScenario runs a random scenario and verifies all positions stay in bounds.
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func testToroidalBoundsScenario(t *testing.T, rng *rand.Rand, rows, cols int) {
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g := NewGrid(rows, cols)
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// Add random walls
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numWalls := rng.Intn(rows*cols/20) // Up to 5% wall density
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for i := 0; i < numWalls; i++ {
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row := rng.Intn(rows*3) - rows // Can be negative or >= rows
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col := rng.Intn(cols*3) - cols
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g.Set(row, col, TileWall)
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}
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// Test that all wall positions are in bounds
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for pos := range g.Walls {
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if !posInBounds(pos, rows, cols) {
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t.Errorf("Wall position %v out of bounds for %dx%d grid", pos, rows, cols)
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}
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}
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// Test Wrap with random positions (including out of bounds)
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for i := 0; i < 1000; i++ {
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row := rng.Intn(rows*10) - rows*5 // Wide range including negative
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col := rng.Intn(cols*10) - cols*5
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wrapped := g.Wrap(row, col)
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if !posInBounds(wrapped, rows, cols) {
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t.Errorf("Wrap(%d, %d) = %v out of bounds for %dx%d grid", row, col, wrapped, rows, cols)
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}
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}
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// Test Move from random positions in all directions
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testPositions := []Position{
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{0, 0}, {0, cols - 1}, {rows - 1, 0}, {rows - 1, cols - 1}, // Corners
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{rows / 2, cols / 2}, // Center
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{0, cols / 2}, {rows - 1, cols / 2}, // Middle of edges
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}
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directions := []Direction{DirN, DirE, DirS, DirW}
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for _, pos := range testPositions {
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for _, dir := range directions {
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moved := g.Move(pos, dir)
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if !posInBounds(moved, rows, cols) {
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t.Errorf("Move(%v, %v) = %v out of bounds for %dx%d grid", pos, dir, moved, rows, cols)
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}
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}
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}
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// Test Neighbors returns positions within bounds
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center := Position{rows / 2, cols / 2}
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neighbors := g.Neighbors(center, 49) // vision radius
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for _, n := range neighbors {
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if !posInBounds(n, rows, cols) {
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t.Errorf("Neighbors(%v, 49) returned out-of-bounds position %v for %dx%d grid", center, n, rows, cols)
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}
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}
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// Test VisibleFrom returns positions within bounds
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positions := []Position{{0, 0}, {rows - 1, cols - 1}}
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visible := g.VisibleFrom(positions, 49)
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for pos := range visible {
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if !posInBounds(pos, rows, cols) {
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t.Errorf("VisibleFrom returned out-of-bounds position %v for %dx%d grid", pos, rows, cols)
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}
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}
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}
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// posInBounds checks if a position is within the grid bounds.
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func posInBounds(pos Position, rows, cols int) bool {
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return pos.Row >= 0 && pos.Row < rows && pos.Col >= 0 && pos.Col < cols
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}
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