Function prependMockHistory

desktop/src/testing/e2eBridge.ts:3077–3129

(input: {
  channelName: string;
  count: number;
  startIndex?: number;
  lineCount?: number;
  createdAtStart?: number;
  emit?: boolean;
})

}

function prependMockHistory(input: {
  channelName: string;
  count: number;
  startIndex?: number;
  lineCount?: number;
  createdAtStart?: number;
  emit?: boolean;
}) {
  const channel = mockChannels.find(
    (candidate) => candidate.name === input.channelName,
  );
  if (!channel) {
    throw new Error(`Unknown mock channel: ${input.channelName}`);
  }

  const store = getMockMessageStore(channel.id);
  const earliestCreatedAt = store.reduce(
    (earliest, event) => Math.min(earliest, event.created_at),
    Math.floor(Date.now() / 1000),
  );
  const createdAtStart =
    input.createdAtStart ?? earliestCreatedAt - input.count - 1;
  const startIndex = input.startIndex ?? 0;
  const lineCount = input.lineCount ?? 1;

  const events = Array.from({ length: input.count }, (_, offset) => {
    const index = startIndex + offset;
    const body = Array.from(
      { length: lineCount },
      (_unused, lineIndex) => `mock older ${index} line ${lineIndex + 1}`,
    ).join("\n");

    return createMockEvent(
      9,
      body,
      [["h", channel.id]],
      ALICE_PUBKEY,
      createdAtStart + offset,
      `mock-older-${channel.name}-${index}`.replace(/[^a-zA-Z0-9]/g, ""),
    );
  });

  store.unshift(...events);
  store.sort((left, right) => left.created_at - right.created_at);

  if (input.emit) {
    for (const event of events) {
      emitMockLiveEvent(channel.id, event);
    }
  }

  return events;
}

function emitMockHistory(
  socket: MockSocket,