test(desktop): wait for terminal writes to finish

Author: Bill Leoutsakos

apps/desktop/src/main/terminal/selection.test.ts

@@ -1,4 +1,3 @@
-import { sleep } from '@sim/utils/helpers'
 import { Terminal } from '@xterm/headless'
 import { describe, expect, it } from 'vitest'
 import { findSelectedRow } from '@/main/terminal/session'
@@ -7,14 +6,14 @@ const REVERSE = '\u001b[7m'
 const RESET = '\u001b[0m'
 
 /**
- * Writes to a real headless emulator and lets it settle, so these exercise the
- * same buffer the agent reads rather than a hand-built fake. xterm parses
- * asynchronously, hence the flush.
+ * Writes to a real headless emulator and waits for the queued writes to finish,
+ * so these exercise the same buffer the agent reads. The trailing empty write's
+ * callback fires after xterm has parsed every preceding chunk.
  */
 async function screen(write: (term: Terminal) => void, rows = 8): Promise<Terminal> {
   const term = new Terminal({ cols: 40, rows, allowProposedApi: true })
   write(term)
-  await sleep(30)
+  await new Promise<void>((resolve) => term.write('', resolve))
   return term
 }