Initial import from garrytan/gstack@026751e (main snapshot via local relay)

Source: https://github.com/garrytan/gstack/commit/026751e

browse/test/error-handling.test.ts

@@ -0,0 +1,47 @@
+import { describe, test, expect } from 'bun:test';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import { safeUnlink, safeKill, isProcessAlive } from '../src/error-handling';
+
+describe('safeUnlink', () => {
+  test('removes an existing file', () => {
+    const tmp = path.join(os.tmpdir(), `test-safeUnlink-${Date.now()}`);
+    fs.writeFileSync(tmp, 'hello');
+    safeUnlink(tmp);
+    expect(fs.existsSync(tmp)).toBe(false);
+  });
+
+  test('ignores ENOENT (file does not exist)', () => {
+    expect(() => safeUnlink('/tmp/nonexistent-file-' + Date.now())).not.toThrow();
+  });
+
+  test('rethrows non-ENOENT errors', () => {
+    // Attempt to unlink a directory — throws EPERM/EISDIR
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'test-safeUnlink-'));
+    expect(() => safeUnlink(dir)).toThrow();
+    fs.rmdirSync(dir);
+  });
+});
+
+describe('safeKill', () => {
+  test('sends signal to a running process', () => {
+    // signal 0 is a no-op existence check — safe to send to self
+    expect(() => safeKill(process.pid, 0)).not.toThrow();
+  });
+
+  test('ignores ESRCH (process does not exist)', () => {
+    // PID 99999999 is extremely unlikely to exist
+    expect(() => safeKill(99999999, 0)).not.toThrow();
+  });
+});
+
+describe('isProcessAlive', () => {
+  test('returns true for current process', () => {
+    expect(isProcessAlive(process.pid)).toBe(true);
+  });
+
+  test('returns false for non-existent process', () => {
+    expect(isProcessAlive(99999999)).toBe(false);
+  });
+});