DEV: adds tests for transformers (#28207)

This commit adds tests for:
- header-notifications-avatar-size
- home-logo-href

app/assets/javascripts/discourse/tests/acceptance/transformers/header-notifications-avatar-size-test.js

@@ -0,0 +1,27 @@
+import { visit } from "@ember/test-helpers";
+import { test } from "qunit";
+import { withPluginApi } from "discourse/lib/plugin-api";
+import { acceptance } from "discourse/tests/helpers/qunit-helpers";
+
+acceptance("header-notifications-avatar-size transformer", function (needs) {
+  needs.user();
+
+  test("applying a value transformation", async function (assert) {
+    withPluginApi("1.34.0", (api) => {
+      api.registerValueTransformer(
+        "header-notifications-avatar-size",
+        () => "huge"
+      );
+    });
+
+    await visit("/");
+
+    assert
+      .dom(".current-user .avatar")
+      .hasAttribute("width", "144", "it transforms the avatar width");
+
+    assert
+      .dom(".current-user .avatar")
+      .hasAttribute("height", "144", "it transforms the avatar height");
+  });
+});

app/assets/javascripts/discourse/tests/acceptance/transformers/home-logo-href-test.js

@@ -0,0 +1,21 @@
+import { visit } from "@ember/test-helpers";
+import { test } from "qunit";
+import { withPluginApi } from "discourse/lib/plugin-api";
+import { acceptance } from "discourse/tests/helpers/qunit-helpers";
+
+acceptance("home-logo-href transformer", function () {
+  test("applying a value transformation", async function (assert) {
+    withPluginApi("1.34.0", (api) => {
+      api.registerValueTransformer(
+        "home-logo-href",
+        ({ value }) => value + "transformed"
+      );
+    });
+
+    await visit("/");
+
+    assert
+      .dom(".title > a")
+      .hasAttribute("href", "/transformed", "it transforms the logo link href");
+  });
+});