2 files changed, 43 insertions, 2 deletions
diff --git a/src/simulation/actions.js b/src/simulation/actions.js
index dd7c4e6..e389518 100644
--- a/src/simulation/actions.js
+++ b/src/simulation/actions.js
@@ -100,7 +100,7 @@ const place = {
 const trigger = {
   size: 1,
   propose: (world, agent, head) => {
-  if (head[0] < threshold) { return []; }
+    if (head[0] < threshold) { return []; }
     else {
       const dx = { n: 0, e: 1, s: 0, w: -1 }[agent.flags.orientation];
       const dy = { n: -1, e: 0, s: 1, w: 0 }[agent.flags.orientation];
@@ -116,7 +116,28 @@ const trigger = {
 };
 
 
+const pretend_frozen = {
+  size: 1,
+  propose: (world, agent, head) => {
+    if (head[0] < threshold) { return [{
+      agent_changes: [{
+        agent_id: agent.id,
+        flags: { pretend_frozen: false },
+      }],
+    }]; }
+    else {
+      return [{
+        agent_changes: [{
+          agent_id: agent.id,
+          flags: { pretend_frozen: true },
+        }]
+      }];
+    }
+  },
+};
+
+
 export const actions = [
   move_forward, move_backward, turn_left, turn_right, 
-  place, trigger,
+  place, trigger, pretend_frozen,
 ];
diff --git a/src/simulation/actions.test.js b/src/simulation/actions.test.js
index 1ebe9a9..43ad23c 100644
--- a/src/simulation/actions.test.js
+++ b/src/simulation/actions.test.js
@@ -7,6 +7,7 @@ const [
   move_forward, move_backward, 
   turn_left, turn_right,
   place, trigger,
+  pretend_frozen,
   ...rest
 ] = actions;
 
@@ -197,3 +198,22 @@ test("trigger", () => {
   expect(trigger.propose(null, e, [0])).toEqual([]);
   expect(trigger.propose(null, w, [-1])).toEqual([]);
  });
+
+
+test("pretend frozen", () => {
+  const agent = { id: 2, x: 0, y: 0, flags: { orientation: 'n' } };
+
+  expect(pretend_frozen.propose(null, agent, [1])).toEqual([{
+    agent_changes: [{
+      agent_id: 2,
+      flags: { pretend_frozen: true },
+    }]
+  }]);
+
+  expect(pretend_frozen.propose(null, agent, [0])).toEqual([{
+    agent_changes: [{
+      agent_id: 2,
+      flags: { pretend_frozen: false },
+    }]
+  }]);
+});