Migrate assertEquals with array parameter to assertArrayEquals

[puskarpeter]

What's changed?

Added a test case to cover the mentioned use case.

What's your motivation?

• assertEquals in JUnit4 accepts Object[], to preserve the behaviour we need to rewrite it into assertArrayEquals
  https://junit.org/junit4/javadoc/4.13/org/junit/Assert.html#assertEquals(java.lang.Object%5B%5D,%20java.lang.Object%5B%5D)

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

Any additional context

Checklist

• I've added unit tests to cover both positive and negative cases
• I've added the license header to any new files through ./gradlew licenseFormat
• I've used the IntelliJ auto-formatter on affected files
• I've updated the documentation (if applicable)