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Test Info:
/* Any copyright is dedicated to the Public Domain.
// Test that top-level await expressions work as expected.
"use strict";
const TEST_URI =
"data:text/html;charset=utf-8,<!DOCTYPE html>Web Console test top-level await";
add_task(async function () {
// Enable await mapping.
await pushPref("devtools.debugger.features.map-await-expression", true);
const hud = await openNewTabAndConsole(TEST_URI);
info("Evaluate a top-level await expression");
const simpleAwait = `await new Promise(r => setTimeout(() => r(["await1"]), 500))`;
await executeAndWaitForResultMessage(hud, simpleAwait, `Array [ "await1" ]`);
// Check that the resulting promise of the async iife is not displayed.
const messages = hud.ui.outputNode.querySelectorAll(".message .message-body");
const messagesText = Array.from(messages)
.map(n => n.textContent)
.join(" - ");
is(
messagesText,
`${simpleAwait} - Array [ "await1" ]`,
"The output contains the the expected messages"
);
// Check that the timestamp of the result is accurate
const { visibleMessages, mutableMessagesById } = hud.ui.wrapper
.getStore()
.getState().messages;
const [commandId, resultId] = visibleMessages;
const delta =
mutableMessagesById.get(resultId).timeStamp -
mutableMessagesById.get(commandId).timeStamp;
Assert.greaterOrEqual(
delta,
500,
`The result has a timestamp at least 500ms (${delta}ms) older than the command`
);
info("Check that assigning the result of a top-level await expression works");
await executeAndWaitForResultMessage(
hud,
`x = await new Promise(r => setTimeout(() => r("await2"), 500))`,
`await2`
);
let message = await executeAndWaitForResultMessage(
hud,
`"-" + x + "-"`,
`"-await2-"`
);
ok(message.node, "`x` was assigned as expected");
info("Check that a logged promise is still displayed as a promise");
message = await executeAndWaitForResultMessage(
hud,
`new Promise(r => setTimeout(() => r(1), 1000))`,
`Promise {`
);
ok(message, "Promise are displayed as expected");
info("Check that then getters aren't called twice");
message = await executeAndWaitForResultMessage(
hud,
// It's important to keep the last statement of the expression as it covers the original issue.
// We could execute another expression to get `object.called`, but since we get a preview
// of the object with an accurate `called` value, this is enough.
`
var obj = {
called: 0,
get then(){
this.called++
}
};
await obj`,
`Object { called: 1, then: Getter }`
);
});