diff --git a/src/panels/index.ts b/src/panels/index.ts
index 4033f95af..c05277bfe 100644
--- a/src/panels/index.ts
+++ b/src/panels/index.ts
@@ -79,7 +79,7 @@ export default class PanelManager extends Module<PanelsConfig> {
    *  buttons  : [...],
    * });
    */
-  addPanel(panel: Panel | Array<Record<string, any>>) {
+  addPanel(panel: Panel | Record<string, any>[]) {
     return this.panels.add(panel);
   }
 
diff --git a/test/specs/panels/index.js b/test/specs/panels/index.ts
similarity index 88%
rename from test/specs/panels/index.js
rename to test/specs/panels/index.ts
index b87efb101..2c903db88 100644
--- a/test/specs/panels/index.js
+++ b/test/specs/panels/index.ts
@@ -1,6 +1,6 @@
-import Panels from 'panels';
-import Panel from 'panels/model/Panel';
-import Editor from 'editor/model/Editor';
+import Panels from '../../../src/panels';
+import Panel from '../../../src/panels/model/Panel';
+import Editor from '../../../src/editor/model/Editor';
 
 describe('Panels', () => {
   describe('Main', () => {
@@ -81,21 +81,21 @@ describe('Panels', () => {
     });
 
     test('Active correctly activable buttons', () => {
-      var spy = sinon.spy();
-      var panel = obj.addPanel({ id: 'test' });
-      var btn = obj.addButton('test', { id: 'btn', active: true });
-      btn.on('updateActive', spy);
+      const fn = jest.fn();
+      obj.addPanel({ id: 'test' });
+      const btn = obj.addButton('test', { id: 'btn', active: true });
+      btn.on('updateActive', fn);
       obj.active();
-      expect(spy.called).toEqual(true);
+      expect(fn).toBeCalledTimes(1);
     });
 
     test('Disable correctly buttons flagged as disabled', () => {
-      var spy = sinon.spy();
-      var panel = obj.addPanel({ id: 'test' });
-      var btn = obj.addButton('test', { id: 'btn', disable: true });
-      btn.on('change:disable', spy);
+      const fn = jest.fn();
+      obj.addPanel({ id: 'test' });
+      const btn = obj.addButton('test', { id: 'btn', disable: true });
+      btn.on('change:disable', fn);
       obj.disableButtons();
-      expect(spy.called).toEqual(true);
+      expect(fn).toBeCalledTimes(1);
     });
 
     test("Can't remove button to non existent panel", () => {