ci: split remaining one-minute lanes

scripts/snapshot-shards.spec.ts

@@ -0,0 +1,45 @@
+import { existsSync, readdirSync } from 'node:fs'
+import { join, relative, sep } from 'node:path'
+import { describe, expect, it } from 'vitest'
+import { selectSnapshotLane, snapshotLanes } from './snapshot-shards.ts'
+
+const root = join(import.meta.dirname, '..')
+
+function snapshotFiles(dir: string): string[] {
+  if (!existsSync(dir)) return []
+  return readdirSync(dir, { withFileTypes: true }).flatMap((entry) => {
+    const path = join(dir, entry.name)
+    if (entry.isDirectory()) return snapshotFiles(path)
+    return entry.name.endsWith('.snapshot.ts') ? [relative(root, path).split(sep).join('/')] : []
+  })
+}
+
+describe('snapshot lanes', () => {
+  it('assigns every configured snapshot file and every ACP scenario shard', () => {
+    const discovered = [
+      ...snapshotFiles(join(root, 'examples')),
+      ...snapshotFiles(join(root, 'packages/sdk')),
+      ...snapshotFiles(join(root, 'packages/ui/tui')),
+    ].filter(path => !path.includes('/node_modules/') && !path.includes('/lib/')).sort()
+    const ordinary = snapshotLanes.filter(lane => lane.scenarioShard === undefined).flatMap(lane => lane.files)
+    const acp = snapshotLanes.filter(lane => lane.scenarioShard !== undefined)
+
+    expect(new Set(ordinary).size).toBe(ordinary.length)
+    expect(acp.map(lane => lane.files)).toEqual(Array.from(
+      { length: 4 },
+      () => ['examples/acp-agent/tests/acp.snapshot.ts'],
+    ))
+    expect(acp.map(lane => lane.scenarioShard)).toEqual(['1/4', '2/4', '3/4', '4/4'])
+    expect([...ordinary, 'examples/acp-agent/tests/acp.snapshot.ts'].sort()).toEqual(discovered)
+  })
+
+  it('keeps ordinary runs complete and selects known lanes', () => {
+    expect(selectSnapshotLane()).toEqual({ name: 'complete', files: [] })
+    expect(selectSnapshotLane('')).toEqual({ name: 'complete', files: [] })
+    for (const lane of snapshotLanes) expect(selectSnapshotLane(lane.name)).toBe(lane)
+  })
+
+  it('rejects an unknown lane', () => {
+    expect(() => selectSnapshotLane('missing')).toThrow('unknown DSH_SNAPSHOT_LANE')
+  })
+})