chore: import upstream snapshot with attribution

apps/sim/blocks/visibility/client.test.ts

@@ -0,0 +1,89 @@
+/**
+ * @vitest-environment node
+ */
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { mockNotify } = vi.hoisted(() => ({ mockNotify: vi.fn() }))
+
+vi.mock('@/blocks/custom/client-overlay', () => ({
+  notifyBlockOverlayChanged: mockNotify,
+}))
+
+import type { BlockVisibilityState } from '@/lib/core/config/block-visibility'
+// client-boundary-allow: vitest ignores the 'use client' directive; this node-env test exercises the module directly
+import { hydrateBlockVisibility, resetBlockVisibilityForSwitch } from '@/blocks/visibility/client'
+import { overlayVisibility, registerBlockCacheInvalidator } from '@/blocks/visibility/context'
+
+function state(revealed: string[], disabled: string[] = []): BlockVisibilityState {
+  return {
+    revealed: new Set(revealed),
+    disabled: new Set(disabled),
+    previewTagged: new Set(revealed),
+  }
+}
+
+describe('hydrateBlockVisibility', () => {
+  beforeEach(() => vi.clearAllMocks())
+
+  // Must run FIRST: module state starts null and persists across tests.
+  it('treats an empty state while none is set as a no-op (null ≡ empty)', () => {
+    const invalidator = vi.fn()
+    const unregister = registerBlockCacheInvalidator(invalidator)
+
+    hydrateBlockVisibility(state([]))
+    expect(overlayVisibility()).toBeNull()
+    expect(invalidator).not.toHaveBeenCalled()
+    expect(mockNotify).not.toHaveBeenCalled()
+
+    unregister()
+  })
+
+  it('applies state, fires invalidators, and bumps the overlay version', () => {
+    const invalidator = vi.fn()
+    const unregister = registerBlockCacheInvalidator(invalidator)
+
+    hydrateBlockVisibility(state(['gmail_v2']))
+    expect(overlayVisibility()?.revealed.has('gmail_v2')).toBe(true)
+    expect(invalidator).toHaveBeenCalledTimes(1)
+    expect(mockNotify).toHaveBeenCalledTimes(1)
+
+    unregister()
+  })
+
+  it('drops reveals but carries kill switches over on workspace switch', () => {
+    const invalidator = vi.fn()
+    const unregister = registerBlockCacheInvalidator(invalidator)
+
+    // Reveal + kill-switch in workspace A, then switch (loader resets while the
+    // new projection loads). (notion_v3: distinct from prior tests' state —
+    // module state persists.)
+    hydrateBlockVisibility(state(['notion_v3'], ['slack']))
+    resetBlockVisibilityForSwitch()
+    expect(overlayVisibility()?.revealed.size).toBe(0)
+    expect(overlayVisibility()?.previewTagged.size).toBe(0)
+    expect(overlayVisibility()?.disabled).toEqual(new Set(['slack']))
+    expect(invalidator).toHaveBeenCalledTimes(2)
+
+    // Repeated resets are no-ops (deep-equal).
+    resetBlockVisibilityForSwitch()
+    expect(invalidator).toHaveBeenCalledTimes(2)
+
+    unregister()
+  })
+
+  it('no-ops on a deep-equal state (fresh objects, same content)', () => {
+    const invalidator = vi.fn()
+    const unregister = registerBlockCacheInvalidator(invalidator)
+
+    hydrateBlockVisibility(state(['gmail_v2'], ['slack']))
+    hydrateBlockVisibility(state(['gmail_v2'], ['slack']))
+    expect(invalidator).toHaveBeenCalledTimes(1)
+    expect(mockNotify).toHaveBeenCalledTimes(1)
+
+    hydrateBlockVisibility(state(['gmail_v2', 'notion_v3'], ['slack']))
+    expect(invalidator).toHaveBeenCalledTimes(2)
+    expect(mockNotify).toHaveBeenCalledTimes(2)
+
+    unregister()
+  })
+})