ci: split remaining one-minute lanes

examples/acp-agent/tests/snapshot-scenario-shard.spec.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from 'vitest'
+import { snapshotScenarioShardFromEnv } from './snapshot-scenario-shard.ts'
+
+describe('ACP snapshot scenario shard environment', () => {
+  it('keeps ordinary snapshot runs complete', () => {
+    expect(snapshotScenarioShardFromEnv()).toBeUndefined()
+    expect(snapshotScenarioShardFromEnv('')).toBeUndefined()
+  })
+
+  it('parses a valid one-based shard', () => {
+    expect(snapshotScenarioShardFromEnv('2/4')).toEqual({ index: 2, total: 4 })
+  })
+
+  it.each(['0/1', '1/0', '2/1', '1.5/2', 'missing', '999999999999999999999/999999999999999999999'])(
+    'rejects %s',
+    (value) => {
+      expect(() => snapshotScenarioShardFromEnv(value)).toThrow('DSH_SNAPSHOT_SCENARIO_SHARD')
+    },
+  )
+})