DEV: Add test for avatar-uploader (#15633)

Follow up to 64b089072a.

app/assets/javascripts/discourse/tests/integration/components/avatar-uploader-test.js

@@ -0,0 +1,41 @@
+import componentTest, {
+  setupRenderingTest,
+} from "discourse/tests/helpers/component-test";
+import pretender from "discourse/tests/helpers/create-pretender";
+import {
+  createFile,
+  discourseModule,
+} from "discourse/tests/helpers/qunit-helpers";
+import hbs from "htmlbars-inline-precompile";
+
+discourseModule("Integration | Component | avatar-uploader", function (hooks) {
+  setupRenderingTest(hooks);
+
+  hooks.beforeEach(function () {
+    pretender.post("/uploads.json", () => {
+      return [200, { "Content-Type": "application/json" }, {}];
+    });
+  });
+
+  componentTest("default", {
+    template: hbs`{{avatar-uploader
+      id="avatar-uploader"
+      done=done
+    }}`,
+
+    async test(assert) {
+      const done = assert.async();
+
+      this.set("done", () => {
+        assert.ok(true, "action is called after avatar is uploaded");
+        done();
+      });
+
+      await this.container
+        .lookup("service:app-events")
+        .trigger("upload-mixin:avatar-uploader:add-files", [
+          createFile("avatar.png"),
+        ]);
+    },
+  });
+});