Class MockChildProcess

src/node/services/browser/BrowserControlService.test.ts:15–55

const SESSION_NAME = "session-a";

class MockChildProcess extends EventEmitter {
  public readonly stdout = new PassThrough();
  public readonly stderr = new PassThrough();
  public readonly kill = mock(() => true);
  public readonly pid = undefined;
  public readonly stdin = null;
  public killed = false;
  public exitCode: number | null = null;
  public signalCode: NodeJS.Signals | null = null;

  override emit(event: string | symbol, ...args: unknown[]): boolean {
    if (event === "close") {
      this.exitCode = (args[0] as number | null | undefined) ?? null;
      this.signalCode = (args[1] as NodeJS.Signals | null | undefined) ?? null;
    }
    if (event === "error") {
      this.killed = true;
    }
    return super.emit(event, ...args);
  }

  writeStdout(chunk: string): void {
    this.stdout.write(chunk);
  }

  writeStderr(chunk: string): void {
    this.stderr.write(chunk);
  }

  close(code = 0, signal: NodeJS.Signals | null = null): void {
    this.emit("close", code, signal);
    this.stdout.end();
    this.stderr.end();
  }

  fail(error: Error): void {
    this.emit("error", error);
    this.stdout.end();
    this.stderr.end();
  }
}

function createAttachableSession() {
  return {