MikeMcl_decimal.js/test/modules/fromJSON.js

if (typeof T === 'undefined') require('../setup');

(function () {
    T('fromJSON');

    Decimal.config({
        //crypto: true,
        precision: Math.random() * 40 + 1 | 0,
        rounding: Math.random() * 9 | 0,
        toExpNeg: -7,
        toExpPos: 21,
        minE: -9e15,
        maxE: 9e15
    });

    var e, fromJ, i, r, toJ;
    var maxDigits = 100;

    for ( i = 0; i < 100000; ) {

        // Get a random value in the range [0,1) with a random number of significant digits
        // in the range [1, maxDigits], as a string in exponential format.
        e = Decimal.random( Math.random() * maxDigits + 1 | 0 ).toExponential();

        // Change exponent to a non-zero value of random length in the range (-9e15, 9e15).
        r = new Decimal(e.slice(0, e.indexOf('e') + 1) + ( Math.random() < 0.5 ? '-' : '' ) +
          ( n = Math.floor( Math.random() * 9e15 ) + '' ).slice( Math.random() * n.length | 0 ));
          //( n = Math.floor( Math.random() * 40 ) + '' ).slice( Math.random() * n.length | 0 ));

        //console.log(r.toString());

        toJ = r.toJSON();
        //console.log(' toJ:   ' + toJ);

        fromJ = Decimal.fromJSON(toJ);
        //console.log(' fromJ:   ' + fromJ);

        /*
        if (!r.eq(fromJ)) {
            console.error(' r:     ' + r);
            console.error(' toJ:   ' + toJ);
            console.error(' fromJ: ' + fromJ);
        }
        */
        T.assert(r.eq(fromJ));
    }

    T.stop();
})();