From b22713c5faa5006c98a37c32cf64d7608d3305d7 Mon Sep 17 00:00:00 2001
From: Marc Rousavy <me@mrousavy.com>
Date: Tue, 28 Apr 2026 17:32:15 +0200
Subject: [PATCH] test: Add Harness test for
 `supportedMultiCamDeviceCombinations` again - now with fixed nitrogen
 `__element`

---
 .../__tests__/visioncamera.devices.harness.ts | 50 +++++++++++++++++
 .../__tests__/visioncamera.session.harness.ts | 55 +++++++++++++++++++
 2 files changed, 105 insertions(+)

diff --git a/apps/simple-camera/__tests__/visioncamera.devices.harness.ts b/apps/simple-camera/__tests__/visioncamera.devices.harness.ts
index a88366a12e..414019cc6e 100644
--- a/apps/simple-camera/__tests__/visioncamera.devices.harness.ts
+++ b/apps/simple-camera/__tests__/visioncamera.devices.harness.ts
@@ -151,4 +151,54 @@ describe('VisionCamera - Devices', () => {
     expect(factory.userPreferredCamera?.id).toBe(back.id)
     factory.userPreferredCamera = previous
   })
+
+  it('returns an empty supportedMultiCamDeviceCombinations array when the platform does not support multi-cam', () => {
+    if (VisionCamera.supportsMultiCamSessions) {
+      console.log(
+        '[SKIP] supportedMultiCamDeviceCombinations empty: platform supports multi-cam',
+      )
+      return
+    }
+    expect(factory.supportedMultiCamDeviceCombinations.length).toBe(0)
+  })
+
+  it('returns at least one supportedMultiCamDeviceCombinations combination when the platform supports multi-cam', () => {
+    if (!VisionCamera.supportsMultiCamSessions) {
+      console.log(
+        '[SKIP] supportedMultiCamDeviceCombinations non-empty: multi-cam not supported on this platform',
+      )
+      return
+    }
+    expect(factory.supportedMultiCamDeviceCombinations.length).toBeGreaterThanOrEqual(1)
+  })
+
+  it('every device in a supportedMultiCamDeviceCombinations combination is also present in cameraDevices', () => {
+    const combinations = factory.supportedMultiCamDeviceCombinations
+    if (combinations.length === 0) {
+      console.log(
+        '[SKIP] supportedMultiCamDeviceCombinations device lookup: no combinations on this platform',
+      )
+      return
+    }
+    const knownIds = new Set(factory.cameraDevices.map((d) => d.id))
+    for (const combination of combinations) {
+      expect(combination.length).toBeGreaterThan(0)
+      for (const device of combination) {
+        expect(knownIds.has(device.id)).toBe(true)
+      }
+    }
+  })
+
+  it('logs every supported multi-cam device combination', () => {
+    const combinations = factory.supportedMultiCamDeviceCombinations
+    console.log(
+      `supportedMultiCamDeviceCombinations: ${combinations.length} combinations`,
+    )
+    for (const [index, combination] of combinations.entries()) {
+      const description = combination
+        .map((d) => `${d.position}:${d.id}`)
+        .join(', ')
+      console.log(`  [${index}] ${description}`)
+    }
+  })
 })
diff --git a/apps/simple-camera/__tests__/visioncamera.session.harness.ts b/apps/simple-camera/__tests__/visioncamera.session.harness.ts
index 919202fc06..e08f296118 100644
--- a/apps/simple-camera/__tests__/visioncamera.session.harness.ts
+++ b/apps/simple-camera/__tests__/visioncamera.session.harness.ts
@@ -254,4 +254,59 @@ describe('VisionCamera - Session', () => {
     await session.stop()
     sub.remove()
   })
+
+  it('configures, starts and stops a multi-cam session for every supported device combination', async () => {
+    if (!VisionCamera.supportsMultiCamSessions) {
+      console.log(
+        '[SKIP] multi-cam combinations: not supported on this platform',
+      )
+      return
+    }
+    const combinations = factory.supportedMultiCamDeviceCombinations
+    if (combinations.length === 0) {
+      console.log(
+        '[SKIP] multi-cam combinations: no combinations reported on this device',
+      )
+      return
+    }
+
+    for (const combination of combinations) {
+      const session = await VisionCamera.createCameraSession(true)
+      const connections = combination.map((device) => ({
+        input: device,
+        outputs: [
+          {
+            output: VisionCamera.createPhotoOutput({
+              targetResolution: CommonResolutions.HD_4_3,
+              containerFormat: 'jpeg' as const,
+              quality: 0.8,
+              qualityPrioritization: 'balanced' as const,
+            }),
+            mirrorMode: 'auto' as const,
+          },
+        ],
+        constraints: [],
+      }))
+
+      const controllers = await session.configure(connections)
+      expect(controllers.length).toBe(combination.length)
+      for (let i = 0; i < combination.length; i++) {
+        expect(controllers[i]?.device.id).toBe(combination[i]?.id)
+      }
+
+      let started = false
+      const sub = session.addOnStartedListener(() => {
+        started = true
+      })
+      await session.start()
+      await waitUntil(() => started, { timeout: 15_000 })
+      await session.stop()
+      sub.remove()
+
+      const description = combination
+        .map((d) => `${d.position}:${d.id}`)
+        .join(', ')
+      console.log(`multi-cam session ok: [${description}]`)
+    }
+  })
 })