何时使用带有笑话和酵素的单元测试或快照测试？

Question

我开始用玩笑和酶为我的react应用程序编写测试，以测试本机和前端，并且我想清楚何时使用快照测试以及何时使用单元测试。

Answer 1

Snapshots are a tool used in unit testing. If you don't use snapshots, then you end up with large chunks of test data in your unit test code. For example, imagine you are testing a function that returns a hundred lines of text, like a blog post. One way would be to have an expect(blogPost).toBe(thisHugeStringOfManyLines) . We can use snapshots to easily manage large chunks of test data. Jest creates separate files for test data, and provides an easy diffing mechanism to see what parts of data has changed. In case of react and enzyme, the testing data is JSX.