Actually check if the negative tests do their job

[Sfiguz7]

Description

While adding tests to #3920 I pushed some tests which would never fail, this fixes them

Proposed changes

Set a flag if the event failure is correctly caught. If not the test has actually failed, so we throw a new exception of our own.

Related Issues (if applicable)

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

Your Pull Request was automatically labelled as: "✨ Fix"
Thank you for contributing to this project! ❤️

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Slimefun preview build

A Slimefun preview build is available for testing!
Commit: 5e1334cb

https://preview-builds.walshy.dev/download/Slimefun/4054/5e1334cb

Note: This is not a supported build and is only here for the purposes of testing.
Do not run this on a live server and do not report bugs anywhere but this PR!

[JustAHuman-xD]

This works but ima check when I'm on my computer if there is a cleaner way to do this

[JustAHuman-xD]

(I may or may not have completely forgot about this, I'd say just go for it since nothing jumps out as better)

[JustAHuman-xD]

LGTM

[WalshyDev]

Actually a much easier way to do this:

Assertions.assertThrows(
    AssertionError.class,
    () -> server.getPluginManager().assertEventFired(TalismanActivateEvent.class, e -> true)
);

[JustAHuman-xD]

Walshy chad moment

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[Sfiguz7]

Oh wow, cool trick

[JustAHuman-xD]

LGTM (idk if I'm allowed to approve a pr that I committed to like this....)