Update README.md

Author: learning-zone

README.md

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 + Apply adequate **design patterns**, especially **dependency injection** that allows separating an object's creation responsibility from business logic
 + Avoid global mutable state
 
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 ## Guidelines
 
 The goal of these guidelines is to make your tests:
@@ -80,7 +84,9 @@ How? Why?
 
 Note that code written without a test-first approach is often very hard to test.
 
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 ### Structure your tests properly