fast-check
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Property based testing framework for JavaScript (like QuickCheck)
72 lines (71 loc) • 2.98 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BigIntArbitrary = void 0;
const Stream_1 = require("../../stream/Stream");
const Arbitrary_1 = require("../../check/arbitrary/definition/Arbitrary");
const Value_1 = require("../../check/arbitrary/definition/Value");
const BiasNumericRange_1 = require("./helpers/BiasNumericRange");
const ShrinkBigInt_1 = require("./helpers/ShrinkBigInt");
const globals_1 = require("../../utils/globals");
class BigIntArbitrary extends Arbitrary_1.Arbitrary {
constructor(min, max) {
super();
this.min = min;
this.max = max;
}
generate(mrng, biasFactor) {
const range = this.computeGenerateRange(mrng, biasFactor);
return new Value_1.Value(mrng.nextBigInt(range.min, range.max), undefined);
}
computeGenerateRange(mrng, biasFactor) {
if (biasFactor === undefined || mrng.nextInt(1, biasFactor) !== 1) {
return { min: this.min, max: this.max };
}
const ranges = (0, BiasNumericRange_1.biasNumericRange)(this.min, this.max, BiasNumericRange_1.bigIntLogLike);
if (ranges.length === 1) {
return ranges[0];
}
const id = mrng.nextInt(-2 * (ranges.length - 1), ranges.length - 2);
return id < 0 ? ranges[0] : ranges[id + 1];
}
canShrinkWithoutContext(value) {
return typeof value === 'bigint' && this.min <= value && value <= this.max;
}
shrink(current, context) {
if (!BigIntArbitrary.isValidContext(current, context)) {
const target = this.defaultTarget();
return (0, ShrinkBigInt_1.shrinkBigInt)(current, target, true);
}
if (this.isLastChanceTry(current, context)) {
return Stream_1.Stream.of(new Value_1.Value(context, undefined));
}
return (0, ShrinkBigInt_1.shrinkBigInt)(current, context, false);
}
defaultTarget() {
if (this.min <= 0 && this.max >= 0) {
return (0, globals_1.BigInt)(0);
}
return this.min < 0 ? this.max : this.min;
}
isLastChanceTry(current, context) {
if (current > 0)
return current === context + (0, globals_1.BigInt)(1) && current > this.min;
if (current < 0)
return current === context - (0, globals_1.BigInt)(1) && current < this.max;
return false;
}
static isValidContext(current, context) {
if (context === undefined) {
return false;
}
if (typeof context !== 'bigint') {
throw new Error(`Invalid context type passed to BigIntArbitrary (#1)`);
}
const differentSigns = (current > 0 && context < 0) || (current < 0 && context > 0);
if (context !== (0, globals_1.BigInt)(0) && differentSigns) {
throw new Error(`Invalid context value passed to BigIntArbitrary (#2)`);
}
return true;
}
}
exports.BigIntArbitrary = BigIntArbitrary;