1 files changed, 58 insertions, 0 deletions
diff --git a/src/simulation/lattice_rules.test.js b/src/simulation/lattice_rules.test.js
index a91400e..681b721 100644
--- a/src/simulation/lattice_rules.test.js
+++ b/src/simulation/lattice_rules.test.js
@@ -2,6 +2,15 @@ import { world_update } from '../world/world.js';
 import { lattice_rules } from './lattice_rules.js';
 
 
+function apply(f, n, x0) {
+  if (n == 0) {
+    return x0;
+  } else {
+    return f(apply(f, n-1, x0));
+  }
+}
+
+
 test("blinker", () => {
   const L = { type: 'active', flags: {} };
   const D = { type: 'empty', flags: {} };
@@ -23,3 +32,52 @@ test("blinker", () => {
   ]);
   expect(world_update(world_update(world)).lattice).toEqual(lattice);
 });
+
+
+test("glider", () => {
+  const L = { type: 'active', flags: {} };
+  const D = { type: 'empty', flags: {} };
+  const lattice = [
+    [ D, D, D, D, D, D ],
+    [ D, D, D, L, D, D ],
+    [ D, L, D, L, D, D ],
+    [ D, D, L, L, D, D ],
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, D, D ],
+  ];
+
+  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [] };
+  //expect(world_update(world).lattice).toEqual([
+  expect(apply(world_update, 1, world).lattice).toEqual([
+    [ D, D, D, D, D, D ],
+    [ D, D, L, D, D, D ],
+    [ D, D, D, L, L, D ],
+    [ D, D, L, L, D, D ],
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, D, D ],
+  ]);
+  expect(apply(world_update, 2, world).lattice).toEqual([
+    [ D, D, D, D, D, D ],
+    [ D, D, D, L, D, D ],
+    [ D, D, D, D, L, D ],
+    [ D, D, L, L, L, D ],
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, D, D ],
+  ]);
+  expect(apply(world_update, 3, world).lattice).toEqual([
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, D, D ],
+    [ D, D, L, D, L, D ],
+    [ D, D, D, L, L, D ],
+    [ D, D, D, L, D, D ],
+    [ D, D, D, D, D, D ],
+  ]);
+  expect(apply(world_update, 4, world).lattice).toEqual([
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, D, D ],
+    [ D, D, D, D, L, D ],
+    [ D, D, L, D, L, D ],
+    [ D, D, D, L, L, D ],
+    [ D, D, D, D, D, D ],
+  ]);
+});