Add DashboardUtils test

packages/dashboard/src/DashboardUtils.test.tsx

@@ -0,0 +1,23 @@
+import React from 'react';
+import { connect } from 'react-redux';
+import { canHaveRef } from './DashboardUtils';
+import { type PanelProps } from './DashboardPlugin';
+
+test('canHaveRef', () => {
+  function TestComponent() {
+    return <div>Test</div>;
+  }
+
+  class TestClass extends React.PureComponent<PanelProps> {
+    render() {
+      return <div>Test</div>;
+    }
+  }
+
+  expect(canHaveRef(TestComponent)).toBe(false);
+  expect(canHaveRef(React.forwardRef(TestComponent))).toBe(true);
+  expect(canHaveRef(TestClass)).toBe(true);
+  expect(
+    canHaveRef(connect(null, null, null, { forwardRef: true })(TestClass))
+  ).toBe(true);
+});