[WIP] Add test for DummyJSONService with black box methodology

[Copilot]

Plan for Adding DummyJSONService Black Box Test

• Install testing framework (Vitest) and testing utilities
• Set up MSW (Mock Service Worker) for API mocking
• Create test file for DummyJSONService
• Implement black box tests for all four methods:
  • getProducts() with default and custom parameters
  • getProduct(id) with valid ID
  • getCategories()
  • getProductsByCategory(category)
• Test error handling scenarios
• Add test script to package.json
• Run tests to verify implementation
• Update configuration files as needed

Original prompt

Add a test for DummyJSONService with a focus on black box methodogly testing

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