Merging tests for flattenStyle
Reviewed By: yungsters Differential Revision: D7176652 fbshipit-source-id: 25b6f2e4f8397ba6f07b2913775b91af90b45750
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@ -8,30 +8,48 @@
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*/
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'use strict';
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var flattenStyle = require('flattenStyle');
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const StyleSheet = require('StyleSheet');
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const StyleSheetValidation = require('StyleSheetValidation');
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const flattenStyle = require('flattenStyle');
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function getFixture() {
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StyleSheetValidation.addValidStylePropTypes({
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styleA: () => {},
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styleB: () => {},
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});
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return StyleSheet.create({
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elementA: {
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styleA: 'moduleA/elementA/styleA',
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styleB: 'moduleA/elementA/styleB',
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},
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elementB: {
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styleB: 'moduleA/elementB/styleB',
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},
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});
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}
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describe('flattenStyle', () => {
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it('should merge style objects', () => {
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var style1 = {width: 10};
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var style2 = {height: 20};
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var flatStyle = flattenStyle([style1, style2]);
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const style1 = {width: 10};
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const style2 = {height: 20};
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const flatStyle = flattenStyle([style1, style2]);
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expect(flatStyle.width).toBe(10);
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expect(flatStyle.height).toBe(20);
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});
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it('should override style properties', () => {
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var style1 = {backgroundColor: '#000', width: 10};
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var style2 = {backgroundColor: '#023c69', width: null};
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var flatStyle = flattenStyle([style1, style2]);
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const style1 = {backgroundColor: '#000', width: 10};
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const style2 = {backgroundColor: '#023c69', width: null};
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const flatStyle = flattenStyle([style1, style2]);
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expect(flatStyle.backgroundColor).toBe('#023c69');
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expect(flatStyle.width).toBe(null);
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});
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it('should overwrite properties with `undefined`', () => {
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var style1 = {backgroundColor: '#000'};
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var style2 = {backgroundColor: undefined};
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var flatStyle = flattenStyle([style1, style2]);
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const style1 = {backgroundColor: '#000'};
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const style2 = {backgroundColor: undefined};
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const flatStyle = flattenStyle([style1, style2]);
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expect(flatStyle.backgroundColor).toBe(undefined);
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});
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@ -40,11 +58,99 @@ describe('flattenStyle', () => {
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});
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it('should recursively flatten arrays', () => {
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var style1 = {width: 10};
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var style2 = {height: 20};
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var style3 = {width: 30};
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var flatStyle = flattenStyle([null, [], [style1, style2], style3]);
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const style1 = {width: 10};
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const style2 = {height: 20};
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const style3 = {width: 30};
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const flatStyle = flattenStyle([null, [], [style1, style2], style3]);
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expect(flatStyle.width).toBe(30);
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expect(flatStyle.height).toBe(20);
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});
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it('should not allocate an object when there is no style', () => {
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const nullStyle = flattenStyle(null);
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const nullStyleAgain = flattenStyle(null);
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expect(nullStyle).toBe(nullStyleAgain);
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expect(nullStyle).toBe(undefined);
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});
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it('should not allocate an object when there is a style', () => {
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const style = {a: 'b'};
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const nullStyle = flattenStyle(style);
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expect(nullStyle).toBe(style);
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});
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it('should not allocate an object when there is a single class', () => {
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const fixture = getFixture();
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var singleStyle = flattenStyle(fixture.elementA);
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var singleStyleAgain = flattenStyle(fixture.elementA);
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expect(singleStyle).toBe(singleStyleAgain);
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expect(singleStyle).toEqual({
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styleA: 'moduleA/elementA/styleA',
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styleB: 'moduleA/elementA/styleB',
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});
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});
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it('should merge single class and style properly', () => {
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const fixture = getFixture();
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var style = {styleA: 'overrideA', styleC: 'overrideC'};
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var arrayStyle = flattenStyle([fixture.elementA, style]);
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expect(arrayStyle).toEqual({
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styleA: 'overrideA',
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styleB: 'moduleA/elementA/styleB',
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styleC: 'overrideC',
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});
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});
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it('should merge multiple classes', () => {
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const fixture = getFixture();
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var AthenB = flattenStyle([fixture.elementA, fixture.elementB]);
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var BthenA = flattenStyle([fixture.elementB, fixture.elementA]);
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expect(AthenB).toEqual({
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styleA: 'moduleA/elementA/styleA',
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styleB: 'moduleA/elementB/styleB',
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});
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expect(BthenA).toEqual({
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styleA: 'moduleA/elementA/styleA',
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styleB: 'moduleA/elementA/styleB',
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});
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});
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it('should merge multiple classes with style', () => {
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const fixture = getFixture();
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var style = {styleA: 'overrideA'};
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var AthenB = flattenStyle([fixture.elementA, fixture.elementB, style]);
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var BthenA = flattenStyle([fixture.elementB, fixture.elementA, style]);
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expect(AthenB).toEqual({
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styleA: 'overrideA',
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styleB: 'moduleA/elementB/styleB',
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});
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expect(BthenA).toEqual({
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styleA: 'overrideA',
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styleB: 'moduleA/elementA/styleB',
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});
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});
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it('should flatten recursively', () => {
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const fixture = getFixture();
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var style = [{styleA: 'newA', styleB: 'newB'}, {styleA: 'newA2'}];
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var AthenB = flattenStyle([fixture.elementA, fixture.elementB, style]);
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expect(AthenB).toEqual({
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styleA: 'newA2',
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styleB: 'newB',
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});
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});
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it('should ignore invalid class names', () => {
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var invalid = flattenStyle(1234, null);
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expect(invalid).toEqual({});
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// Invalid class name 1234 skipping ...
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});
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});
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