fix(test): prevent memory and resource leaks in test infrastructure

[wvanderen]

Pull Request Draft

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Title: fix(test): prevent memory and resource leaks in test infrastructure

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Summary

Fixes critical resource leaks in test infrastructure that were causing:

• Temporary directories accumulating indefinitely
• Spawned processes leaking on test failures
• OOM crashes during test runs (vitest workers consuming ~900MB each)
• Terminals closing unexpectedly (appears as "freezes" to developers)

Changes

1. Re-enable Temp Directory Cleanup

File: packages/opencode/test/fixture/fixture.ts

  const result = {
    [Symbol.asyncDispose]: async () => {
      await options?.dispose?.(dirpath)
-     // await fs.rm(dirpath, { recursive: true, force: true })
+     await fs.rm(dirpath, { recursive: true, force: true })
    },
    path: realpath,
    extra: extra as T,
  }

Impact: Temp directories created by tmpdir() fixture are now properly deleted when tests complete. Previously commented out, causing directories to accumulate in /tmp/ forever.

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2. Add Process Cleanup Guarantees to LSP Tests

File: packages/opencode/test/lsp/client.test.ts

Wrapped all LSP client tests with try/finally blocks:

  test("handles workspace/workspaceFolders request", async () => {
    const handle = spawnFakeServer() as any

-   const client = await Instance.provide({...})
-   // ... test code ...
-   await client.shutdown()
+   try {
+     const client = await Instance.provide({...})
+     // ... test code ...
+     await client.shutdown()
+   } finally {
+     handle.process.kill()
+   }
  })

Impact: Fake LSP server processes are now always killed, even when tests throw exceptions before reaching shutdown(). Previously, failing tests would leave orphan Node.js processes consuming memory.

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Motivation

While developing locally, terminals running OpenCode tests would "freeze" then close unexpectedly. Investigation revealed:

Evidence from System Logs

Jan 17 13:14 - vitest worker memory usage:
• vitest 1: 897 MB
• vitest 2: 900 MB
• vitest 3: 910 MB
• vitest 4: 905 MB
• vitest 5: 898 MB
• vitest 7: 912 MB

Total: ~5.3 GB for test workers alone!

OOM Killer Activity

Jan 17 13:14:28 lemarchy kernel: Out of memory: Killed process 1750015 (node (vitest 7))
  total-vm:4985788kB, anon-rss:3646756kB, file-rss:620kB

V8 Stack Traces

V8::FatalProcessOutOfMemory
→ Node aborts (signal 6/ABRT)
→ Terminal closes

System State

• Swap: 3.9 GB / 4 GB used (95% full)
• Workers: 6-11 vitest workers spawned per run
• Impact: System becomes sluggish, eventually unresponsive

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Testing

Verify Temp Directory Cleanup

# Run tests
cd packages/opencode
bun test --run

# Check temp directories (should be clean or minimal)
ls -la /tmp/ | grep opencode-test

Expected: Minimal or no opencode-test-* directories remaining.

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Verify Process Cleanup

# Temporarily force a test to fail
# Edit packages/opencode/test/lsp/client.test.ts:
test("handles workspace/workspaceFolders request", async () => {
  const handle = spawnFakeServer() as any
  throw new Error("Force failure")  // Temporary: test cleanup
})

# Run tests
bun test

# Check for orphan processes (should be none)
ps aux | grep fake-lsp-server

Expected: No fake-lsp-server processes running after test failure.

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Verify Memory Stability in Watch Mode

# Monitor memory usage during watch mode
watch -n 5 'ps aux | grep "vitest\|bun test" | awk "{sum += \$6} END {print "Total RSS:", sum/1024, "MB"}'

# In another terminal, run tests in watch mode
cd packages/opencode
bun test  # Let run for 10+ minutes

Expected: Memory usage remains stable (doesn't grow indefinitely).

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Impact

• Developers: Test runs no longer consume increasing memory/disk
• CI/CD: Reduced OOM failures in test pipelines
• System: Stable swap usage, no system-wide slowdowns
• Experience: Tests run reliably without unexpected terminal closures

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Related Issues

Fixes #9136

• #7261 - "v1.1.6 still has memory bloat - heap not released + MCP orphan processes" (similar pattern)
• #8899 / #8898 - "test: tests fail for developers with global git hooks" (same fixture file)

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Checklist

• [x] Code follows project style guidelines
• [x] Tests pass locally: bun test
• [x] No new warnings or errors
• [x] Documentation updated (if applicable)
• [x] Commit messages are clear and descriptive

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Notes

• This is a first-time open source contribution
• Process leaks are a common pattern — any test spawning subprocesses should use try/finally or afterEach hooks

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Files Changed

packages/opencode/test/fixture/fixture.ts     | 2 +-
packages/opencode/test/lsp/client.test.ts      | 69 ++++++++++++++--------
2 files changed, 71 insertions(+), 58 deletions(-)

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OpenCode Version

v1.1.24 (dev branch)

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Environment

• OS: Arch Linux 6.18.3-arch1-1
• Terminal: Alacritty
• Node: v25.2.1
• RAM: 30 GB