Closes #368 - allow diff Switcher Key constant name

[petruki]

This pull request improves how Switcher Keys are registered and validated, enhances documentation, and refines test coverage and configuration. The key changes include stricter validation for Switcher Keys to prevent null or empty values, updates to usage documentation, and adjustments to test cases to ensure correct behavior and coverage.

Switcher Key registration and validation:

• Switcher Keys are now registered using their actual string values (not field names), and the code throws a SwitcherContextException if a key is null or empty, ensuring that only valid keys are used. (SwitcherContextBase.java) [1] [2]
• Added new tests to verify that null or empty Switcher Keys cause appropriate exceptions, increasing reliability. (SwitcherFail3Test.java)

Documentation improvements:

• Updated the README.md to clarify how to define Switcher Keys and configure the context, including best practices for key declaration. [1] [2]

Test data update:

• Added a new feature configuration (USECASE1) to the test snapshot fixture to support new key usage in tests. (fixture1.json)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud