diff --git a/web/tests/compose_validate.test.cjs b/web/tests/compose_validate.test.cjs
index ede5f0d1b3..274374b00a 100644
--- a/web/tests/compose_validate.test.cjs
+++ b/web/tests/compose_validate.test.cjs
@@ -3,6 +3,7 @@
 const assert = require("node:assert/strict");
 
 const {mock_banners} = require("./lib/compose_banner.cjs");
+const {FakeComposeBox} = require("./lib/compose_helpers.cjs");
 const {$t} = require("./lib/i18n.cjs");
 const {mock_esm, zrequire} = require("./lib/namespace.cjs");
 const {run_test, noop} = require("./lib/test.cjs");
@@ -116,7 +117,11 @@ function stub_message_row($textarea) {
 }
 
 test_ui("validate_stream_message_address_info", ({mock_template}) => {
-    mock_banners();
+    // For this test we basically only use FakeComposeBox
+    // to set up the DOM environment. We don't assert about
+    // any side effects on the DOM, since the scope of this
+    // test is mostly to make sure the template gets rendered.
+    new FakeComposeBox();
 
     const party_sub = {
         stream_id: 101,
@@ -128,7 +133,6 @@ test_ui("validate_stream_message_address_info", ({mock_template}) => {
 
     party_sub.subscribed = false;
     stream_data.add_sub(party_sub);
-    $("#compose_banners .user_not_subscribed").length = 0;
     let user_not_subscribed_rendered = false;
     mock_template("compose_banner/compose_banner.hbs", true, (data, html) => {
         assert.equal(data.classname, compose_banner.CLASSNAMES.user_not_subscribed);
@@ -142,7 +146,9 @@ test_ui("validate_stream_message_address_info", ({mock_template}) => {
     party_sub.stream_id = 102;
     stream_data.add_sub(party_sub);
     user_not_subscribed_rendered = false;
+
     assert.ok(!compose_validate.validate_stream_message_address_info(party_sub));
+
     assert.ok(user_not_subscribed_rendered);
 });
 
diff --git a/web/tests/lib/compose_helpers.cjs b/web/tests/lib/compose_helpers.cjs
index b1ac6e7edc..b643648a6f 100644
--- a/web/tests/lib/compose_helpers.cjs
+++ b/web/tests/lib/compose_helpers.cjs
@@ -17,7 +17,6 @@ class FakeComposeBox {
             ".message-limit-indicator",
             $.create("limit-indicator-stub"),
         );
-        $("textarea#compose-textarea").toggleClass = noop;
 
         const $message_row_stub = $.create("message_row_stub");
         $("textarea#compose-textarea").closest = (selector) => {
@@ -26,13 +25,15 @@ class FakeComposeBox {
             return $message_row_stub;
         };
 
-        $("textarea#compose-textarea").set_height(50);
-        $("#compose .preview_message_area").css = noop;
-
         this.reset();
     }
 
     reset() {
+        $("#compose_banners .user_not_subscribed").length = 0;
+
+        $("textarea#compose-textarea").toggleClass = noop;
+        $("textarea#compose-textarea").set_height(50);
+        $("#compose .preview_message_area").css = noop;
         $("textarea#compose-textarea").val("default message");
         $("textarea#compose-textarea").trigger("blur");
         $(".compose-submit-button .loader").show();