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167 lines
3.0 KiB
TypeScript
167 lines
3.0 KiB
TypeScript
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import { mergeMargin } from '../src';
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describe('mergeMargin(margin1, margin2, mode?)', () => {
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it('combines two given margin', () => {
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expect(
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mergeMargin(
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{
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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},
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{
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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},
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),
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).toEqual({
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top: 2,
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left: 2,
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bottom: 2,
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right: 2,
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});
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});
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describe('default values', () => {
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it('works if margin1 is not defined', () => {
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expect(
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mergeMargin(undefined, {
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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}),
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).toEqual({
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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});
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});
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it('works if margin2 is not defined', () => {
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expect(
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mergeMargin(
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{
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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},
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undefined,
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),
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).toEqual({
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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});
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});
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it('use 0 for the side that is not specified', () => {
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expect(mergeMargin({}, {})).toEqual({
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top: 0,
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left: 0,
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bottom: 0,
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right: 0,
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});
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});
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});
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describe('mode', () => {
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it('if mode=expand, returns the larger margin for each side', () => {
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expect(
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mergeMargin(
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{
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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},
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{
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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},
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'expand',
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),
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).toEqual({
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top: 2,
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left: 2,
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bottom: 2,
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right: 2,
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});
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});
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it('if mode=shrink, returns the smaller margin for each side', () => {
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expect(
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mergeMargin(
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{
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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},
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{
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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},
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'shrink',
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),
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).toEqual({
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top: 1,
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left: 1,
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bottom: 1,
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right: 1,
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});
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});
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it('expand by default', () => {
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expect(
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mergeMargin(
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{
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top: 1,
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left: 1,
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bottom: 2,
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right: 2,
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},
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{
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top: 2,
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left: 2,
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bottom: 1,
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right: 1,
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},
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),
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).toEqual({
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top: 2,
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left: 2,
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bottom: 2,
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right: 2,
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});
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});
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});
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it('works correctly for negative margins', () => {
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expect(
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mergeMargin(
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{
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top: -3,
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left: -3,
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bottom: -2,
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right: -2,
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},
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{
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top: -2,
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left: -2,
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bottom: 0,
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right: -1,
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},
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),
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).toEqual({
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top: -2,
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left: -2,
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bottom: 0,
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right: -1,
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});
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});
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});
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