chore: import upstream snapshot with attribution

apps/sim/lib/core/async-jobs/region.test.ts

@@ -0,0 +1,42 @@
+/**
+ * @vitest-environment node
+ */
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { mockIsFeatureEnabled } = vi.hoisted(() => ({
+  mockIsFeatureEnabled: vi.fn(),
+}))
+
+vi.mock('@/lib/core/config/feature-flags', () => ({
+  isFeatureEnabled: mockIsFeatureEnabled,
+}))
+
+import {
+  resolveTriggerRegion,
+  TRIGGER_REGION_EU_CENTRAL,
+  TRIGGER_REGION_US_EAST,
+} from '@/lib/core/async-jobs/region'
+
+describe('resolveTriggerRegion', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('returns eu-central-1 when the flag is enabled', async () => {
+    mockIsFeatureEnabled.mockResolvedValue(true)
+    expect(await resolveTriggerRegion()).toBe(TRIGGER_REGION_EU_CENTRAL)
+    expect(mockIsFeatureEnabled).toHaveBeenCalledWith('trigger-eu-region')
+  })
+
+  it('returns us-east-1 when the flag is disabled', async () => {
+    mockIsFeatureEnabled.mockResolvedValue(false)
+    expect(await resolveTriggerRegion()).toBe(TRIGGER_REGION_US_EAST)
+  })
+
+  it('evaluates globally, passing no gating context', async () => {
+    mockIsFeatureEnabled.mockResolvedValue(false)
+    await resolveTriggerRegion()
+    expect(mockIsFeatureEnabled).toHaveBeenCalledTimes(1)
+    expect(mockIsFeatureEnabled.mock.calls[0]).toEqual(['trigger-eu-region'])
+  })
+})