Add note about zero width space

[ibuibu]

Summary

Added the ability to display a NOTE for toEqual(), toStrictEqual() and toBe() when the test fails due to the presence of a zero-width space.

Related

#10584

#13997

Test plan

Test

Result

[SimenB]

@ibuibu thanks for sending a PR! Wouldn't #13997 be better?

[ibuibu]

@SimenB Yes, it is a simple implementation and a good visual representation.

I have three concerns.

• It is difficult to know that it is a ZERO-WIDTH-SPACE because it is displayed as just a space. I thought it would be better to convey this point in the Note as well, as per my PR.

• Only FEFF has been targeted for replacement. However, there are other character codes that are zero-width-space.

• Only the first zero-width-space found is replaced. This is an issue that applies to my PR. However, I thought it might be possible to solve this problem for fix(jest-matcher-utils): show byte order mark character in diff #13997 by simply using replaceAll.

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