2 files changed, 36 insertions, 0 deletions
diff --git a/src/simulation/senses.js b/src/simulation/senses.js
new file mode 100644
index 0000000..4fc96d6
--- /dev/null
+++ b/src/simulation/senses.js
@@ -0,0 +1,18 @@
+'use strict';
+
+
+const frozen = {
+  size: 1,
+  read: (lattice, agent) => {
+    if (agent.flags.frozen === true) {
+      return [ 1 ];
+    } else {
+      return [ 0 ];
+    }
+  },
+};
+
+
+export const senses = [
+  frozen,
+];
diff --git a/src/simulation/senses.test.js b/src/simulation/senses.test.js
new file mode 100644
index 0000000..1caed52
--- /dev/null
+++ b/src/simulation/senses.test.js
@@ -0,0 +1,18 @@
+'use strict';
+
+import { senses } from './senses.js';
+
+const [ frozen, ...rest ] = senses;
+
+
+test("frozen sense", () => {
+  const agent = {
+    id: 0, x: 0, y: 0,
+    flags: { frozen: true, },
+  };
+  const lattice = null;
+
+  expect(frozen.read(lattice, agent)).toEqual([1]);
+  agent.flags.frozen = false;
+  expect(frozen.read(lattice, agent)).toEqual([0]);
+});