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JS Bin // source https://jsbin.com/tipevi/3
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| <script src="https://wzrd.in/standalone/expect@latest"></script> | |
| </head> | |
| <body> | |
| <script id="jsbin-javascript"> | |
| /* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| 'use strict'; | |
| var counter = function counter(state, action) { | |
| if (state === undefined) state = 0; | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state + 1; | |
| case 'DECREMENT': | |
| return state - 1; | |
| default: | |
| return state; | |
| } | |
| }; | |
| expect(counter(0, { type: 'INCREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'INCREMENT' })).toEqual(2); | |
| expect(counter(2, { type: 'DECREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'DECREMENT' })).toEqual(0); | |
| expect(counter(1, { type: 'SOMETHING_ELSE' })).toEqual(1); | |
| expect(counter(undefined, {})).toEqual(0); | |
| console.log('Tests passed!'); | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">/* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| const counter = (state = 0, action) => { | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state + 1; | |
| case 'DECREMENT': | |
| return state - 1; | |
| default: | |
| return state; | |
| } | |
| } | |
| expect( | |
| counter(0, { type: 'INCREMENT' }) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'INCREMENT' }) | |
| ).toEqual(2); | |
| expect( | |
| counter(2, { type: 'DECREMENT' }) | |
| ).toEqual(1); | |
| expect( | |
| counter(1, { type: 'DECREMENT' }) | |
| ).toEqual(0); | |
| expect( | |
| counter(1, { type: 'SOMETHING_ELSE' }) | |
| ).toEqual(1); | |
| expect( | |
| counter(undefined, {}) | |
| ).toEqual(0); | |
| console.log('Tests passed!'); | |
| </script></body> | |
| </html> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /* | |
| * Open the console tab | |
| * to see that the tests pass. | |
| */ | |
| 'use strict'; | |
| var counter = function counter(state, action) { | |
| if (state === undefined) state = 0; | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state + 1; | |
| case 'DECREMENT': | |
| return state - 1; | |
| default: | |
| return state; | |
| } | |
| }; | |
| expect(counter(0, { type: 'INCREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'INCREMENT' })).toEqual(2); | |
| expect(counter(2, { type: 'DECREMENT' })).toEqual(1); | |
| expect(counter(1, { type: 'DECREMENT' })).toEqual(0); | |
| expect(counter(1, { type: 'SOMETHING_ELSE' })).toEqual(1); | |
| expect(counter(undefined, {})).toEqual(0); | |
| console.log('Tests passed!'); |
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