import { add, formatDecimal, multiply, subtract } from '../common/decimal';
import { decimal } from './decimal';

describe('decimal', () => {
  it('keeps signed nanos exact without floats', () => {
    expect(formatDecimal(decimal({ units: 0, nano: -500000000 }))).toBe('-0.5');
    expect(
      formatDecimal(
        add(decimal({ units: '9007199254740993' }), decimal({ nano: 1 })),
      ),
    ).toBe('9007199254740993.000000001');
    expect(
      formatDecimal(
        subtract(decimal({ units: 1 }), decimal({ nano: 500000000 })),
      ),
    ).toBe('0.5');
    expect(
      formatDecimal(
        multiply(decimal({ units: 2 }), decimal({ nano: 500000000 })),
      ),
    ).toBe('1');
  });
});