Added test cases for JSEvalProcessor

[Suvrat1629]

Purpose

Add comprehensive test coverage for the JSEvalProcessor to verify JavaScript function execution on streaming data events. Tests cover arithmetic operations, string manipulation, conditional logic, and complex transformations.

Remarks

PR introduces (a) breaking change(s): no

PR introduces (a) deprecation(s): no

[tenthe]

Hi @Suvrat1629,
thanks a lot for adding the tests — really appreciate your contribution!
It looks like some of them are currently failing in our build pipeline. Could you please take a look and see what might be causing the issue?

Also, if you’re interested, it would be great to add a few tests that use functions with a state. This is described in our blog [1].

If you have any questions, feel free to ask — happy to help!

[1] https://streampipes.apache.org/blog/2025/04/09/javascript-processor/#example-3-stateful-logic

[Suvrat1629]

@tenthe Well I did try to add some more functions to test states please take a look and tell me if this is what was expected.
Thank you.

[tenthe]

Hi @Suvrat1629,
thanks for updating the PR.

There seems to be a problem with the date time test in the build pipeline.

 Error:    JSEvalProcessorTest.testDateTimeOperations:346 Assertion failed for key: hour. Expected: {is_weekend=false, original_timestamp=1694786200000, year=2023.0, day=15.0, month=9.0, hour=19.0}, Actual: {original_timestamp=1694786200000, month=9.0, hour=13.0, year=2023.0, day=15.0, is_weekend=false} ==> expected: <19.0> but was: <13.0>

[github-actions]

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