diff --git a/src/renderer/extensions/vueNodes/components/InputOutputSlot.spec.ts b/src/renderer/extensions/vueNodes/components/InputOutputSlot.spec.ts
new file mode 100644
index 000000000..211aa5b1f
--- /dev/null
+++ b/src/renderer/extensions/vueNodes/components/InputOutputSlot.spec.ts
@@ -0,0 +1,66 @@
+import { mount } from '@vue/test-utils'
+import { createPinia } from 'pinia'
+import { describe, expect, it, vi } from 'vitest'
+import { createI18n } from 'vue-i18n'
+
+import enMessages from '@/locales/en/main.json'
+import { useDomSlotRegistration } from '@/renderer/core/layout/slots/useDomSlotRegistration'
+
+import InputSlot from './InputSlot.vue'
+import OutputSlot from './OutputSlot.vue'
+
+// Mock composable used by InputSlot/OutputSlot so we can assert call params
+vi.mock('@/renderer/core/layout/slots/useDomSlotRegistration', () => ({
+  useDomSlotRegistration: vi.fn(() => ({ remeasure: vi.fn() }))
+}))
+
+const mountWithProviders = (component: any, props: Record<string, unknown>) =>
+  mount(component, {
+    global: {
+      plugins: [
+        createI18n({
+          legacy: false,
+          locale: 'en',
+          messages: { en: enMessages }
+        }),
+        createPinia()
+      ]
+    },
+    props
+  })
+
+describe('InputSlot/OutputSlot', () => {
+  it('InputSlot registers with correct options', () => {
+    vi.mocked(useDomSlotRegistration).mockClear()
+
+    mountWithProviders(InputSlot, {
+      nodeId: 'node-1',
+      index: 3,
+      slotData: { name: 'A', type: 'any', boundingRect: [0, 0, 0, 0] }
+    })
+
+    const call = vi.mocked(useDomSlotRegistration).mock.calls.at(-1)![0]
+    expect(call).toMatchObject({
+      nodeId: 'node-1',
+      slotIndex: 3,
+      isInput: true
+    })
+  })
+
+  it('OutputSlot registers with correct options', () => {
+    vi.mocked(useDomSlotRegistration).mockClear()
+
+    mountWithProviders(OutputSlot, {
+      nodeId: 'node-2',
+      index: 1,
+      slotData: { name: 'B', type: 'any', boundingRect: [0, 0, 0, 0] }
+    })
+
+    const call = vi.mocked(useDomSlotRegistration).mock.calls.at(-1)![0]
+    expect(call).toMatchObject({
+      nodeId: 'node-2',
+      slotIndex: 1,
+      isInput: false
+    })
+  })
+})