superset-frontend/packages/superset-ui-core/test/number-format/NumberFormatter.test.ts

import { NumberFormatter } from '@superset-ui/core/src/number-format';

describe('NumberFormatter', () => {
  describe('new NumberFormatter(config)', () => {
    it('requires config.id', () => {
      expect(
        () =>
          // @ts-ignore
          new NumberFormatter({
            formatFunc: () => '',
          }),
      ).toThrow();
    });
    it('requires config.formatFunc', () => {
      expect(
        () =>
          // @ts-ignore
          new NumberFormatter({
            id: 'my_format',
          }),
      ).toThrow();
    });
  });
  describe('formatter is also a format function itself', () => {
    const formatter = new NumberFormatter({
      id: 'fixed_3',
      formatFunc: value => value.toFixed(3),
    });
    it('returns formatted value', () => {
      expect(formatter(12345.67)).toEqual('12345.670');
    });
    it('formatter(value) is the same with formatter.format(value)', () => {
      const value = 12345.67;
      expect(formatter(value)).toEqual(formatter.format(value));
    });
  });
  describe('.format(value)', () => {
    const formatter = new NumberFormatter({
      id: 'fixed_3',
      formatFunc: value => value.toFixed(3),
    });
    it('handles null', () => {
      expect(formatter.format(null)).toEqual('null');
    });
    it('handles undefined', () => {
      expect(formatter.format(undefined)).toEqual('undefined');
    });
    it('handles NaN', () => {
      expect(formatter.format(NaN)).toEqual('NaN');
    });
    it('handles positive and negative infinity', () => {
      expect(formatter.format(Number.POSITIVE_INFINITY)).toEqual('∞');
      expect(formatter.format(Number.NEGATIVE_INFINITY)).toEqual('-∞');
    });
    it('otherwise returns formatted value', () => {
      expect(formatter.format(12345.67)).toEqual('12345.670');
    });
  });
  describe('.preview(value)', () => {
    const formatter = new NumberFormatter({
      id: 'fixed_2',
      formatFunc: value => value.toFixed(2),
    });
    it('returns string comparing value before and after formatting', () => {
      expect(formatter.preview(100)).toEqual('100 => 100.00');
    });
    it('uses the default preview value if not specified', () => {
      expect(formatter.preview()).toEqual('12345.432 => 12345.43');
    });
  });
});