diff --git a/src/propagators/conditional.test.ts b/src/propagators/conditional.test.ts
index aae5cca..4b84e3c 100644
--- a/src/propagators/conditional.test.ts
+++ b/src/propagators/conditional.test.ts
@@ -1,8 +1,9 @@
 import assert from "node:assert"
 import test from "node:test"
 import { patch } from "../cell/index.js"
+import { nothing } from "../nothing/index.js"
 import { run } from "../scheduler/index.js"
-import { conditional } from "./conditional.js"
+import { conditional, conditionalWriter } from "./conditional.js"
 
 test("propagators / conditional", async () => {
   {
@@ -13,4 +14,13 @@ test("propagators / conditional", async () => {
     await run()
     assert(output.content === 1)
   }
+
+  {
+    const [control, input, ifTrue, ifFalse] = conditionalWriter()
+    patch(control, true)
+    patch(input, 6)
+    await run()
+    assert(ifTrue.content === 6)
+    assert(ifFalse.content === nothing)
+  }
 })