Shulou(Shulou.com)06/01 Report--

This article will explain in detail how to use the F# library canopy for UI testing. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

InfoQ: can you introduce canopy to us?

Chris Holt:canopy is a layer of function based on Selenium and implemented in F#. Its goal is to make the behavior of UI testing meet the expectations of users. Although Selenium performed well, he sometimes seemed too rigid. In canopy, all actions no longer report an error immediately because they can't click on an element, but keep trying to click on an element until they can't click for a reasonable period of time. This will help you create more reliable tests rather than those that tend to be successful only on the first try.

How does InfoQ:canopy simplify the process of UI testing through Selenium?

CH:canopy has built-in retry functions, including the acquisition of elements and the user's behavior on the screen, as well as authentication. In addition, canopy can help users fix common problems with practical error messages, such as spelling errors in a selector. It also supports the selection of elements in a variety of ways and is easy to extend these capabilities.

For example, if the user has a button on the screen that displays the word "Save", you can click simply by writing it as click "Save" in the code. In regular Selenium code, users have to choose between ByText, ById, ByCSS, ByXPath, and so on. To extend this functionality, simply add a corresponding finder implementation to the user's Web page idioms, such as placeholder values in the form data, or artificially defined data-* tags to represent metadata.

Canopy also provides a concise set of API to make it easier for users to read and write tests. It can also overcome the differences in html. For example, each input type is represented differently in html, so they are manipulated differently through the original Selenium. In canopy, the operation is the same. For example:

/ / Assign a value to a textbox or dropdown "# state"

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