82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
'use strict';
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var test = require('tape');
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var inspect = require('object-inspect');
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var hasBigInts = require('has-bigints')();
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var hasSymbols = require('has-symbols')();
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var hasToStringTag = require('has-tostringtag/shams')();
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var isBigInt = require('../');
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var debug = function (v, m) { return inspect(v) + ' ' + m; };
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var forEach = function (arr, func) {
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var i;
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for (i = 0; i < arr.length; ++i) {
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func(arr[i], i, arr);
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}
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};
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test('non-BigInt values', function (t) {
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var nonBigInts = [
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true,
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false,
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Object(true),
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Object(false),
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null,
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undefined,
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{},
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[],
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/a/g,
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'string',
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42,
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new Date(),
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function () {},
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NaN
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];
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if (hasSymbols) {
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nonBigInts.push(Symbol.iterator, Symbol('foo'));
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}
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t.plan(nonBigInts.length);
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forEach(nonBigInts, function (nonBigInt) {
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t.equal(false, isBigInt(nonBigInt), debug(nonBigInt, 'is not a BigInt'));
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});
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t.end();
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});
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test('faked BigInt values', function (t) {
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t.test('real BigInt valueOf', { skip: !hasBigInts }, function (st) {
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var fakeBigInt = { valueOf: function () { return BigInt(42); } };
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st.equal(false, isBigInt(fakeBigInt), 'object with valueOf returning a BigInt is not a BigInt');
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st.end();
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});
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t.test('faked @@toStringTag', { skip: !hasBigInts || !hasToStringTag }, function (st) {
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var fakeBigInt = { valueOf: function () { return BigInt(42); } };
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fakeBigInt[Symbol.toStringTag] = 'BigInt';
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st.equal(false, isBigInt(fakeBigInt), 'object with fake BigInt @@toStringTag and valueOf returning a BigInt is not a BigInt');
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var notSoFakeBigInt = { valueOf: function () { return 42; } };
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notSoFakeBigInt[Symbol.toStringTag] = 'BigInt';
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st.equal(false, isBigInt(notSoFakeBigInt), 'object with fake BigInt @@toStringTag and valueOf not returning a BigInt is not a BigInt');
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st.end();
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});
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var fakeBigIntString = { toString: function () { return '42n'; } };
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t.equal(false, isBigInt(fakeBigIntString), 'object with toString returning 42n is not a BigInt');
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t.end();
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});
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test('BigInt support', { skip: !hasBigInts }, function (t) {
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forEach([
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Function('return 42n')(), // eslint-disable-line no-new-func
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BigInt(42),
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Object(BigInt(42))
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], function (bigInt) {
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t.equal(true, isBigInt(bigInt), debug(bigInt, 'is a BigInt'));
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});
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t.end();
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});
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