Function waitForSnapshot

packages/node/src/__tests__/testingHarness.test.ts:17–33

(
  harness: PtyHarness,
  predicate: (snapshot: TerminalScreenSnapshot) => boolean,
  timeoutMs = 2_000,
)

const isMacOsCi = process.platform === "darwin" && env.CI === "true";

async function waitForSnapshot(
  harness: PtyHarness,
  predicate: (snapshot: TerminalScreenSnapshot) => boolean,
  timeoutMs = 2_000,
): Promise<TerminalScreenSnapshot> {
  const deadline = Date.now() + timeoutMs;
  for (;;) {
    const snapshot = harness.snapshot();
    if (predicate(snapshot)) return snapshot;
    if (Date.now() > deadline) {
      throw new Error(
        `Timed out waiting for PTY snapshot: ${JSON.stringify(snapshot.screen.lines)}`,
      );
    }
    await delay(20);
  }
}

test("createTerminalScreen reconstructs visible lines and cursor position", async () => {
  const screen = createTerminalScreen({ cols: 10, rows: 3 });