Guiding Design Principles

1. Be Predictable
   • Glancing at the test code should be enough to determine which callbacks givens will use to evaluate a specific given value in a specific test.
   • You should never be surprised by a cached value being reset.
2. Be Compatible
   • beforeEach and afterEach should behave as expected. This means that all givens accessible in a test will be accessible by ALL beforeEach and afterEach callbacks run for that test, including ones declared outside the immediate scope of the test.
   • All features of the test harness should remain
3. Self Contained
   • Givens never puts anything on any global scope. everything is contained to the object received from getGiven()
4. Worse is Better
   • Don't add features unless they help without making code with givens harder to understand
5. Be Type-safe
   • Give users the opportunity to be as type safe as they want.