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Contents
import BigInt from './big-integer';
describe('The big-integer module\'s returned object', () => {
let bigI;
beforeEach(() => {
bigI = BigInt(42);
});
afterEach(() => {
bigI = null;
});
it('is not a number', () => {
expect(typeof 42).toBe('number');
expect(typeof bigI).not.toBe('number');
expect(typeof bigI).toBe('object');
});
it('can be compared to a stringified number by calling \'.toString()\'', () => {
expect(bigI).not.toBe(42);
expect(bigI).not.toBe('42');
expect(bigI.toString()).toBe('42');
// NOTE:
// The '==' operator calls '.toString()' here in order to compare.
expect(bigI == '42').toBe(true);
// While the line above is easier to write and read, we will use the
// 'expect(bigI.toString()).toBe(expected)' way so that test failure
// messages will be more informative. Eg,
// "Expected '84' to be '42'." instead of
// "Expected false to be true."
});
it('is immutable', () => {
bigI.add(10);
expect(bigI.toString()).toBe('42');
bigI.subtract(10);
expect(bigI.toString()).toBe('42');
});
it('can add', () => {
bigI = bigI.add(42);
expect(bigI.toString()).toBe('84');
});
it('can perform power operations', () => {
bigI = BigInt(10);
bigI = bigI.pow(2);
expect(bigI.toString()).toBe('100');
});
// ...see the official docs for more info, if you want.
// The "Methods" section of the README is especially useful:
//
// https://github.com/peterolson/BigInteger.js#methods
});
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208 entries across 208 versions & 1 rubygems