Add invisible characters highlighting in diffs

[knowbody]

feature request

What is the current behavior?

Currently the diffs don't check for invisible characters like spaces. I spent a bit of time debugging an invariant error check. And my tests weren't passing because I was leaving a space before the new line character. In the end I used .toThrowErrorMatchingSnapshot() and copy pasting that to my test case made the test pass and made me realise that I was adding that extra space before \n.

.toThrowError("There is no route defined for key Settings. \nMust be one of: 'Home'");

and passes fine when:

.toThrowError("There is no route defined for key Settings.\nMust be one of: 'Home'");

At the moment it's hard to guess, what it is, at first I thought that there was something wrong with how the quotes are being escaped, as that's what is shown in the diff.

What is the expected behavior?

It would be great if we could highlight these invisible characters in the diff.

[thymikee]

Since Jest 18.1.0 we're highlighting trailing whitespace: #2347
Can you update to this version and see if it works for you?

[knowbody]

actually I still get the same thing:

[thymikee]

I've opened a PR with a fix for that

[knowbody]

thank you @thymikee for fixing it!

[github-actions]

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