1 files changed, 31 insertions, 0 deletions
diff --git a/src/simulation/lattice_rules.test.js b/src/simulation/lattice_rules.test.js
index 4b78116..7648a68 100644
--- a/src/simulation/lattice_rules.test.js
+++ b/src/simulation/lattice_rules.test.js
@@ -108,3 +108,34 @@ test("beehive", () => {
   //expect(world_update(world).lattice).toEqual([
   expect(apply(world_update, 1, world).lattice).toEqual(lattice);
 });
+
+
+test("mutables are activated by neighboring actives", () => {
+  const L = { type: 'active', flags: {} };
+  const _ = { type: 'empty', flags: {} };
+  const l = { type: 'active', flags: { emit: [0, 0, 0, 0, 0, 0, 0, 1] } };
+  const d = { type: 'empty', flags: { emit: [0, 0, 0, 0, 0, 0, 0, -1] } };
+  const M = { type: 'mutable', flags: {} };
+
+  const lattice = [
+    [ _, _, _, _, ],
+    [ _, L, M, _, ],
+    [ _, M, M, _, ],
+    [ _, _, _, _, ],
+  ];
+
+  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
+
+  expect(apply(world_update, 1, world).lattice).toEqual([
+    [ _, _, _, _, ],
+    [ _, L, l, _, ],
+    [ _, l, l, _, ],
+    [ _, _, _, _, ],
+  ]);
+  expect(apply(world_update, 2, world).lattice).toEqual([
+    [ _, _, _, _, ],
+    [ _, L, L, _, ],
+    [ _, L, L, _, ],
+    [ _, _, _, _, ],
+  ]);
+});