Refactor Prompt Tests

[kpavlov]

Changes Made

• Created a new abstract base class AbstractPromptTest that contains shared test fields, constants, and data providers
• Extracted serialization-specific tests into a new PromptSerializationTest class
• Updated the original PromptTest class to contain only non-serialization tests
• Both test classes now extend the abstract base class to reuse common test infrastructure
• Replaced all JUnit assertions (assertEquals, assertTrue, assertNull) with their Kotest equivalents (shouldBe, shouldBeTrue, shouldBeNull) for improved readability
• Added shouldBeEqualToComparingFields for serialization tests to make sure all fields are verified. Remove unnecessary explicit assertions.
• Implemented assertSoftly(subject) { ... } for multiple assertions on the same subject
• Added withClue for non-obvious assertions to provide better context for failures

Motivation

This refactoring improves the test organization by:

• Separating concerns: Serialization tests are now isolated from other prompt functionality tests
• Reducing code duplication: Common test setup and data providers are now in a shared abstract class
• Improving maintainability: Each test class has a clear, focused responsibility
• Making tests more readable: Smaller, more focused test classes are easier to understand
• Enhancing test failure messages: Kotest assertions provide more informative error messages
• Grouping related assertions: Using assertSoftly to see all failures at once rather than stopping at the first failure

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Type of the change

• [ ] New feature
• [ ] Bug fix
• [ ] Documentation fix
• [x] Tests improvement

Checklist for all pull requests

• [x] The pull request has a description of the proposed change
• [x] I read the Contributing Guidelines before opening the pull request
• [x] The pull request uses develop as the base branch
• [ ] Tests for the changes have been added
• [x] All new and existing tests passed

Additional steps for pull requests adding a new feature

• [ ] An issue describing the proposed change exists
• [ ] The pull request includes a link to the issue
• [ ] The change was discussed and approved in the issue
• [ ] Docs have been added / updated

[skarpovdev]

Updated the original PromptTest class to contain only non-serialization tests

Was it reverted? I don't see it in the changelist.