DEV: Add simple test for json-schema-editor and remove extra await (#27827)

Followup to ce3d91f422

app/assets/javascripts/discourse/app/components/modal/json-schema-editor.hbs

@@ -6,6 +6,7 @@
     "admin.site_settings.json_schema.modal_title"
     name=@model.settingName
   }}
+  @inline={{@inline}}
   class="json-schema-editor-modal"
 >
   <:body>

app/assets/javascripts/discourse/app/components/modal/json-schema-editor.js

@@ -37,7 +37,7 @@ export default class JsonSchemaEditorModal extends Component {
 
   @action
   async buildJsonEditor(element) {
-    const promise = await import("@json-editor/json-editor");
+    const promise = import("@json-editor/json-editor");
     if (isTesting()) {
       waitForPromise(promise);
     }

app/assets/javascripts/discourse/tests/unit/components/json-schema-editor-test.gjs

@@ -0,0 +1,44 @@
+import { click, fillIn, render } from "@ember/test-helpers";
+import { module, test } from "qunit";
+import JsonSchemaEditor from "discourse/components/modal/json-schema-editor";
+import { setupRenderingTest } from "discourse/tests/helpers/component-test";
+
+const TEST_SCHEMA = {
+  type: "array",
+  uniqueItems: true,
+  items: {
+    type: "object",
+    properties: { color: { type: "string" }, icon: { type: "string" } },
+    additionalProperties: false,
+  },
+};
+
+module("Unit | Component | <JsonSchemaEditor />", function (hooks) {
+  setupRenderingTest(hooks);
+
+  test("modal functions correctly", async function (assert) {
+    let result;
+    const model = {
+      value: "[]",
+      settingName: "My setting name",
+      jsonSchema: TEST_SCHEMA,
+      updateValue: (val) => (result = val),
+    };
+
+    const closeModal = () => {};
+
+    await render(<template>
+      <JsonSchemaEditor
+        @inline={{true}}
+        @model={{model}}
+        @closeModal={{closeModal}}
+      />
+    </template>);
+
+    await click(".json-editor-btn-add");
+    await fillIn("[name='root[0][color]']", "red");
+    await click(".d-modal__footer .btn-primary");
+
+    assert.deepEqual(JSON.parse(result), [{ color: "red", icon: "" }]);
+  });
+});