Function fillStorage

dash/dash-renderer/tests/persistence.test.js:12–42

(store, key)

};

const fillStorage = (store, key) => {
    // double the attempted string until we fail
    // then a binary search to find the exact point of failure
    const maxPow = 30;
    let pow = 0;
    for (; pow < maxPow; pow++) {
        try {
            store.setItem(key, longString(pow));
        } catch (e) {
            break;
        }
    }
    pow--;
    let s = longString(pow);
    for (pow--; pow >= 0; pow--) {
        const s2 = s + longString(pow);
        try {
            store.setItem(key, s2);
            s = s2;
        } catch (e) {
            // s remains as is, next time we'll add half as much
        }
    }
    // finally a sanity check that nothing more can be added
    try {
        store.setItem(key + '+', 'a');
    } catch (e) {
        return;
    }
    throw new Error('Something still fits in the store?');
};

const clearStores = () => {
    window.localStorage.clear();