Apply fixes from StyleCI

[voku]

This pull request applies code style fixes from an analysis carried out by StyleCI.

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Code Review

This pull request consists of stylistic updates and minor cleanup across the test suite, including the expansion of single-line anonymous functions into a multi-line format and the removal of an unused import in ExtraCoverageTest.php. Additionally, it standardizes whitespace in several assertion statements. I have no feedback to provide.