react-native-ui-lib/src/components/tabBar/__tests__/index.spec.js

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import TabBar from '../index';

describe('TabBar', () => {
  it('should calcIndicatorWidth return appropriate size according to TabBarItems count', () => {
    let uut = new TabBar({});
    expect(uut.calcIndicatorWidth()).toBe('0%');
    uut = new TabBar({children: [1]});
    expect(uut.calcIndicatorWidth()).toBe('100%');
    uut = new TabBar({children: [1, 2]});
    expect(uut.calcIndicatorWidth()).toBe('50%');
    uut = new TabBar({children: [1, 2, 3]});
    expect(uut.calcIndicatorWidth()).toBe('33%');
    uut = new TabBar({children: [1, 2, 3, 4]});
    expect(uut.calcIndicatorWidth()).toBe('25%');
  });
});