78 lines
1.9 KiB
JavaScript
78 lines
1.9 KiB
JavaScript
import Zipper from './zipper';
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// Tests adapted from `problem-specifications/zipper/canonical-data.json` @ v1.0.0
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function bt(value, left, right) {
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return {
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value,
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left,
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right,
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};
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}
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function leaf(value) {
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return bt(value, null, null);
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}
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describe('Zipper', () => {
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const t1 = bt(1, bt(2, null, leaf(3)), leaf(4));
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const t2 = bt(1, bt(5, null, leaf(3)), leaf(4));
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const t3 = bt(1, bt(2, leaf(5), leaf(3)), leaf(4));
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const t4 = bt(1, leaf(2), leaf(4));
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const t5 = bt(1, bt(2, null, leaf(3)), bt(6, leaf(7), leaf(8)));
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const t6 = bt(1, bt(2, null, leaf(5)), leaf(4));
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let zipper;
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beforeEach(() => {
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zipper = Zipper.fromTree(t1);
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});
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test('data is retained', () => {
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expect(zipper.toTree()).toEqual(t1);
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});
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test('left, right and value', () => {
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expect(zipper.left().right().value()).toEqual(3);
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});
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test('dead end', () => {
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expect(zipper.left().left()).toBe(null);
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});
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test('tree from deep focus', () => {
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expect(zipper.left().right().toTree()).toEqual(t1);
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});
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test('traversing up from top', () => {
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expect(zipper.up()).toEqual(null);
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});
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test('left, right and up', () => {
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expect(zipper.left().up().right().up().left().right().value()).toEqual(3);
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});
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test('setValue', () => {
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expect(zipper.left().setValue(5).toTree()).toEqual(t2);
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});
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test('setValue after traversing up', () => {
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expect(zipper.left().right().up().setValue(5).toTree()).toEqual(t2);
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});
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test('setLeft with leaf', () => {
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expect(zipper.left().setLeft(leaf(5)).toTree()).toEqual(t3);
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});
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test('setRight with null', () => {
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expect(zipper.left().setRight(null).toTree()).toEqual(t4);
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});
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test('setRight with subtree', () => {
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expect(zipper.setRight(bt(6, leaf(7), leaf(8))).toTree()).toEqual(t5);
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});
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test('setValue on deep focus', () => {
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expect(zipper.left().right().setValue(5).toTree()).toEqual(t6);
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});
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});
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