Fix remote widget undefined arg (#2551)

tests-ui/tests/composables/widgets/useComboWidget.test.ts

@@ -0,0 +1,44 @@
+import { createPinia, setActivePinia } from 'pinia'
+
+import { useComboWidget } from '@/composables/widgets/useComboWidget'
+import type { InputSpec } from '@/types/apiTypes'
+
+jest.mock('@/scripts/widgets', () => ({
+  addValueControlWidgets: jest.fn()
+}))
+
+describe('useComboWidget', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    jest.clearAllMocks()
+  })
+
+  it('should handle undefined spec', () => {
+    const constructor = useComboWidget()
+    const mockNode = {
+      addWidget: jest.fn().mockReturnValue({ options: {} } as any)
+    }
+
+    const inputSpec: InputSpec = ['COMBO', undefined]
+
+    const widget = constructor(
+      mockNode as any,
+      'inputName',
+      inputSpec,
+      undefined as any
+    )
+
+    expect(mockNode.addWidget).toHaveBeenCalledWith(
+      'combo',
+      'inputName',
+      undefined, // default value
+      expect.any(Function), // callback
+      expect.objectContaining({
+        values: 'COMBO'
+      })
+    )
+    expect(widget).toEqual({
+      widget: { options: {} }
+    })
+  })
+})