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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";
/* eslint no-unused-vars: [2, {"vars": "local"}] */
/* import-globals-from ./shared-head.js */
// Common utility functions for working with Redux stores. The file is meant
// to be safe to load in both mochitest and xpcshell environments.
/**
* Wait until the store has reached a state that matches the predicate.
* @param Store store
* The Redux store being used.
* @param function predicate
* A function that returns true when the store has reached the expected
* state.
* @return Promise
* Resolved once the store reaches the expected state.
*/
function waitUntilState(store, predicate) {
return new Promise(resolve => {
const unsubscribe = store.subscribe(check);
info(`Waiting for state predicate "${predicate}"`);
function check() {
if (predicate(store.getState())) {
info(`Found state predicate "${predicate}"`);
unsubscribe();
resolve();
}
}
// Fire the check immediately in case the action has already occurred
check();
});
}
/**
* Wait until a particular action has been emitted by the store.
* @param {Store} store
* The Redux store being used.
* @param {String} actionType
* The expected action to wait for.
* @param {Number} count
* Number of times to expect the action to occur. Default is once.
* @return Promise
* Resolved once the expected action is emitted by the store.
*/
function waitUntilAction(store, actionType, count = 1) {
return new Promise(resolve => {
const unsubscribe = store.subscribe(check);
const history = store.history;
let index = history.length;
info(`Waiting for action "${actionType}"`);
function check() {
const action = history[index++];
if (action && action.type === actionType) {
info(`Found action "${actionType}"`);
count--;
if (count === 0) {
unsubscribe();
resolve(store.getState());
}
}
}
});
}
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