docs(angular): 📝 enhance testing strategy section with visual examples (#13)

Author: yjaaidi

apps/cookbook/docs/angular/01-testing/02-designing-a-pragmatic-testing-strategy/composability-ice-cream-cone.jpg

@@ -148,7 +148,12 @@ Interestingly, in the example above, we can observe that with such an approach,
 The **two extremes that wouldn't work** are the following:
 
 - **Only Wide Tests** _(ice-cream cone)_: We would probably require dozens of relatively complex Wide tests to reach all the edge cases and the same level of confidence.
-- **Over-Narrow Tests** _(misunderstood pyramid)_: We would probably require dozens of over-narrow tests and 3 to 4 Test Doubles to reach all the edge cases.
+
+![Ice-Cream Cone Model Example](./composability-ice-cream-cone.jpg)
+
+- **Over-Narrow Tests** _(misunderstood pyramid)_: We would probably require dozens of over-narrow tests and at least 4 Test Doubles to reach all the edge cases.
+
+![Misunderstood Pyramid Model Example](./composability-misunderstood-pyramid.jpg)
 
 ## What Should Be Tested?