feat: event-not-emitted support

[AuHau]

Support for expectEvent.notEmitted().

Question: Should there be support for argument specification? If so, how should be handled empty args? Should it search for an empty args event or just generally assert if an event was not-emitted?

Closes #120

I will work on changelog/docs after finalizing API/behavior.

[frangio]

@AuHau I think you unintentionally commited style changes. Can you look into that and reverse it? And for the new code please use semicolons following the style of the rest of the project.

[AuHau]

Damn, you are right. Sorry about that. It is fixed.

Btw. I have to used // eslint-disable-next-line no-unused-expressions if you don't wont me to use that there is way using dirty-chai but that would introduce another dependency, so whatever solution is better for you.

[AuHau]

I am not sure why the tests fail as I did not really do anything related to reason why they fail. It seems like they are missing @truffle/debug-utils package?

[frangio]

Yes, there is a bug in Truffle, see trufflesuite/truffle#3024. I changed the package.json in a way I think will fix our CI.

This is looking great! There's a few things missing:

• Settle naming. It has been settled, we like notEmitted, but we should also move the existing negated helpers (not.inTransaction, etc.) into notEmitted so that they can be used with the same syntax. To make it backwards compatible we should alias notEmitted as not, while deprecating not to remove it in the next breaking release.
• Add documentation for the new helper in the docs.
• Add an entry in the changelog.

If there's any of this that you're not sure how to handle please let me know.

[AuHau]

Sounds good! I will make the changes tomorrow :-)

[AuHau]

Ok, ready for review :-)

[frangio]

Awesome! Just a few suggestions.

[frangio]

Thanks @AuHau!