test(windows): make native coverage fixtures portable

packages/subagent/subagent-acp/tests/subagent-acp.spec.ts

@@ -8,6 +8,7 @@ import { fileURLToPath } from 'node:url'
 import SubagentService from '@deepseek-ai/dsh-subagent'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import { MAX_TIMER_DELAY_MS } from '@deepseek-ai/dsh-timeout'
+import type { SubprocessOutcome } from '@deepseek-ai/dsh-subprocess'
 import * as acp from '../src/index.ts'
 import { acpStopReason, acpContentText, DEFAULT_DISPOSE_EOF_GRACE_MS, DEFAULT_DISPOSE_GRACE_MS, disposeAcpChild, startAcpRun, toAcpPrompt, type AcpRunSpec } from '../src/run.ts'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
@@ -108,14 +109,19 @@ describe('child env layering (through the subprocess seam)', () => {
       // The spec.env layer merges after the seam's scrub, so the child's own
       // explicitly-forwarded key survives while ambient credentials do not.
       const running = spawnSubprocess({
-        argv: ['bash', '-c', 'echo "[${ACP_TEST_AMBIENT_SECRET_TOKEN:-absent}|$DEEPSEEK_API_KEY]"'],
+        argv: [
+          process.execPath,
+          '--input-type=module',
+          '--eval',
+          'process.stdout.write(JSON.stringify([process.env.ACP_TEST_AMBIENT_SECRET_TOKEN ?? "absent", process.env.DEEPSEEK_API_KEY]))',
+        ],
         cwd: process.cwd(),
         stdio: { stdin: 'ignore', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
         graceMs: 1000,
         env: { DEEPSEEK_API_KEY: 'explicit' },
       })
       await running.done
-      expect(running.collected.stdout!.readFrom(0).text.trim()).toBe('[absent|explicit]')
+      expect(running.collected.stdout!.readFrom(0).text).toBe('["absent","explicit"]')
     } finally {
       delete process.env.ACP_TEST_AMBIENT_SECRET_TOKEN
     }
@@ -139,42 +145,50 @@ describe('child env layering (through the subprocess seam)', () => {
 })
 
 describe('disposeAcpChild (the backend-owned teardown ladder over seam verbs)', () => {
-  const bash = (command: string, stdin: 'pipe' | 'ignore' = 'pipe') => spawnSubprocess({
-    argv: ['bash', '-c', command],
+  const node = (source: string, stdin: 'pipe' | 'ignore' = 'pipe') => spawnSubprocess({
+    argv: [process.execPath, '--input-type=module', '--eval', source],
     cwd: process.cwd(),
     stdio: { stdin, stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
     graceMs: 200,
   })
+  const expectHostTermination = (outcome: SubprocessOutcome, posixSignal: NodeJS.Signals): void => {
+    if (process.platform === 'win32') {
+      expect(outcome.signal).toBeNull()
+      expect(outcome.exitCode).not.toBe(0)
+    } else {
+      expect(outcome.signal).toBe(posixSignal)
+    }
+  }
 
   it('tier 1: a cooperative child exits on stdin EOF without any signal', async () => {
-    const child = bash('read -r line; exit 0')
+    const child = node('process.stdin.resume(); process.stdin.on("end", () => process.exit(0))')
     await disposeAcpChild(child, 5_000)
     const outcome = await child.done
     expect(outcome.exitCode).toBe(0)
     expect(outcome.signal).toBeNull()
   })
 
-  it('tier 2: an EOF-deaf child dies by the terminate escalation (SIGTERM)', async () => {
-    const child = bash('sleep 60')
+  it('tier 2: an EOF-deaf child reaches the host terminate outcome', async () => {
+    const child = node('setInterval(() => {}, 60_000)')
     await disposeAcpChild(child, 100)
     const outcome = await child.done
-    expect(outcome.signal).toBe('SIGTERM')
+    expectHostTermination(outcome, 'SIGTERM')
   })
 
-  it('tier 3: a TERM-trapping child dies by the escalation SIGKILL', async () => {
-    const child = bash("trap '' TERM; echo armed; sleep 60", 'ignore')
+  it('tier 3: a TERM-trapping child reaches the host force-termination outcome', async () => {
+    const child = node('process.on("SIGTERM", () => {}); process.stdout.write("armed\\n"); setInterval(() => {}, 60_000)', 'ignore')
     // Wait for the trap to arm so SIGTERM cannot race the default handler.
     while (!child.collected.stdout!.readFrom(0).text.includes('armed')) {
       await new Promise(resolve => setTimeout(resolve, 10))
     }
     await disposeAcpChild(child, 50)
     const outcome = await child.done
-    expect(outcome.signal).toBe('SIGKILL')
+    expectHostTermination(outcome, 'SIGKILL')
   })
 
   it('observes a spawn-level rejection and returns without a process to reap', async () => {
     const child = spawnSubprocess({
-      argv: ['bash', '-c', 'true'],
+      argv: [process.execPath, '--input-type=module', '--eval', ''],
       cwd: '/nonexistent-dir-dsh-acp-ladder-test',
       stdio: { stdin: 'ignore', stdout: { maxBytes: 1000 }, stderr: { maxBytes: 1000 } },
       graceMs: 200,