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exercism fetch ecmascript pascals-triangle

pascals-triangle.spec.js

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import Triangle from './pascals-triangle';

describe('Triangle', () => {
  test('with one row', () => {
    expect(new Triangle(1).rows).toEqual([[1]]);
  });

  xtest('with two rows', () => {
    expect(new Triangle(2).rows).toEqual([[1], [1, 1]]);
  });

  xtest('with three rows', () => {
    expect(new Triangle(3).rows).toEqual([[1], [1, 1], [1, 2, 1]]);
  });

  xtest('last row', () => {
    expect(new Triangle(4).lastRow).toEqual([1, 3, 3, 1]);
  });

  xtest('fifth row', () => {
    expect(new Triangle(5).lastRow).toEqual([1, 4, 6, 4, 1]);
  });

  xtest('twentieth row', () => {
    const twentieth = [1, 19, 171, 969, 3876, 11628, 27132, 50388, 75582, 92378, 92378, 75582, 50388, 27132, 11628, 3876, 969, 171, 19, 1];
    expect(new Triangle(20).lastRow).toEqual(twentieth);
  });
});