Improve assertion usages in test suite

[peter279k]

Q	A
Documentation	no
Bugfix	no
BC Break	no
New Feature	no
RFC	no
QA	no
Tests	yes

Description

• Using the assertCount to assert expected count is same as result count.
• Using the assertSame to assert exception message when catching block has been triggered on some testing methods.
• Removing some variables because they're declared, but not used.

[Ocramius]

Overall, I see nothing wrong with this patch, but the component is in "maintenance only" or "security only" mode, so unless we get an active dedicated maintainer for it, we should really not merge improvements 🤔

[Ocramius]

Tried to re-apply this in #11 (after a rebase), but it won't cleanly apply.

If/when you can, please rebase and let's get this to a green state before merging :-)

[Ocramius]

Thanks @peter279k!