Changes for page Testable Design

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...	...	@@ -28,6 +28,7 @@
28	28	* **Avoid the singleton design pattern** because its private constructor prevents mocking. Consider a getInstance() method that returns an interface type instead.
29	29	* **Favor composition over inheritance.** Use inheritance only for polymorphism, as it is less flexible than composition. Composition should be the primary approach to code reuse.
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	31	+=== ===
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32	32	=== Testable Architecture ===
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