Zhentiw - 博客园

2018年7月10日

[E2E] Visual Differing Tests with Puppeteer and PixelMatch

摘要： Take your end to end tests to the next level by comparing your current application's view with an already accepted screenshot. With the combination of 阅读全文

posted @ 2018-07-10 20:53 Zhentiw 阅读(448) 评论(0) 推荐(0)

[Jest] Write data driven tests in Jest with test.each

摘要： Often, we end up creating multiple unit tests for the same unit of code to make sure it behaves as expected with varied input. This is a good practice 阅读全文

posted @ 2018-07-10 19:27 Zhentiw 阅读(439) 评论(0) 推荐(0)

[Tools] Using colours in a NodeJS terminal - make your output pop

摘要： Use can use colour and styles to make it easy to spot errors and group common functionality into blocks when viewing a NodeJS console. This lesson wil 阅读全文

posted @ 2018-07-10 18:34 Zhentiw 阅读(178) 评论(0) 推荐(0)

[Tool] Open Multiple Terminal Tabs on npm Start with ttab and npm-run-all

摘要： Often times when developing web applications, you need to open multiple tabs to run different scripts to start the application. This can all be done w 阅读全文

posted @ 2018-07-10 18:16 Zhentiw 阅读(430) 评论(0) 推荐(0)

2018年7月9日

[Angular] Why should we using Protal

摘要： Origianl article Protal from Angular CDK, is a way to create dynammic component. Consider an example of Page toolbar. This toolbar should show differe 阅读全文

posted @ 2018-07-09 20:34 Zhentiw 阅读(525) 评论(1) 推荐(0)

[React Testing] Confidently Ship Production React Apps

摘要： We want to make sure that when we ship new code, our users can use the application. The best way we've found to do that is to write automated tests th 阅读全文

posted @ 2018-07-09 18:39 Zhentiw 阅读(245) 评论(0) 推荐(0)

2018年7月8日

[RxJS 6] The Catch and Rethrow RxJs Error Handling Strategy and the finalize Operator

摘要： Sometime we want to set a default or fallback value when network request failed. Sometime we want to just throw the error again: You know about the fi 阅读全文

posted @ 2018-07-08 01:13 Zhentiw 阅读(440) 评论(0) 推荐(0)

[RxJS 6] The Retry RxJs Error Handling Strategy

摘要： When we want to handle error observable in RxJS v6+, we can use 'retryWhen' and 'delayWhen': 阅读全文

posted @ 2018-07-08 01:06 Zhentiw 阅读(182) 评论(0) 推荐(0)

2018年7月6日

[Javascript] AbortController to cancel the fetch request

摘要： We are able to cancel the fetch request by using AbortController with RxJS Observable. 阅读全文

posted @ 2018-07-06 18:05 Zhentiw 阅读(331) 评论(0) 推荐(0)

[RxJS] exhaustMap vs switchMap vs concatMap

摘要： exhaustMap: It drop the outter observable, just return the inner observable, and it waits until previous observable complete before emit next observab 阅读全文

posted @ 2018-07-06 17:56 Zhentiw 阅读(460) 评论(0) 推荐(0)

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