diff --git a/src/renderer/extensions/vueNodes/components/InputOutputSlot.test.ts b/src/renderer/extensions/vueNodes/components/InputOutputSlot.test.ts
new file mode 100644
index 0000000000..d10c9c3828
--- /dev/null
+++ b/src/renderer/extensions/vueNodes/components/InputOutputSlot.test.ts
@@ -0,0 +1,86 @@
+import { type ComponentMountingOptions, mount } from '@vue/test-utils'
+import { createPinia } from 'pinia'
+import { beforeEach, 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() }))
+}))
+
+type InputSlotProps = ComponentMountingOptions<typeof InputSlot>['props']
+type OutputSlotProps = ComponentMountingOptions<typeof OutputSlot>['props']
+
+const mountInputSlot = (props: InputSlotProps) =>
+  mount(InputSlot, {
+    global: {
+      plugins: [
+        createI18n({
+          legacy: false,
+          locale: 'en',
+          messages: { en: enMessages }
+        }),
+        createPinia()
+      ]
+    },
+    props
+  })
+
+const mountOutputSlot = (props: OutputSlotProps) =>
+  mount(OutputSlot, {
+    global: {
+      plugins: [
+        createI18n({
+          legacy: false,
+          locale: 'en',
+          messages: { en: enMessages }
+        }),
+        createPinia()
+      ]
+    },
+    props
+  })
+
+describe('InputSlot/OutputSlot', () => {
+  beforeEach(() => {
+    vi.mocked(useDomSlotRegistration).mockClear()
+  })
+
+  it('InputSlot registers with correct options', () => {
+    mountInputSlot({
+      nodeId: 'node-1',
+      index: 3,
+      slotData: { name: 'A', type: 'any', boundingRect: [0, 0, 0, 0] }
+    })
+
+    expect(useDomSlotRegistration).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        nodeId: 'node-1',
+        slotIndex: 3,
+        isInput: true
+      })
+    )
+  })
+
+  it('OutputSlot registers with correct options', () => {
+    mountOutputSlot({
+      nodeId: 'node-2',
+      index: 1,
+      slotData: { name: 'B', type: 'any', boundingRect: [0, 0, 0, 0] }
+    })
+
+    expect(useDomSlotRegistration).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        nodeId: 'node-2',
+        slotIndex: 1,
+        isInput: false
+      })
+    )
+  })
+})