browser_sendMessageToTarget.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

add_task(async function sendToAttachedTarget({ client }) {

  const { Target } = client;

  const { targetInfo } = await openTab(Target);

  const attachedToTarget = Target.attachedToTarget();

  const { sessionId } = await Target.attachToTarget({

    targetId: targetInfo.targetId,

});

  await attachedToTarget;

  info("Target attached");

  const id = 1;

  const message = JSON.stringify({

id,

    method: "Page.navigate",

    params: {

      url: toDataURL("new-page"),

},

});

  info("Calling Target.sendMessageToTarget");

  const onResponse = Target.receivedMessageFromTarget();

  await Target.sendMessageToTarget({ sessionId, message });

  const response = await onResponse;

  info("Message from target received");

  ok(!!response, "The response is not empty");

  is(response.sessionId, sessionId, "The response is from the same session");

  const responseMessage = JSON.parse(response.message);

  is(responseMessage.id, id, "The response is from the same session");

ok(

    !!responseMessage.result.frameId,

    "received the `frameId` out of `Page.navigate` request"

);

});