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Vertical testability allows for the testing of individual components or layers of a system in isolation, ensuring that each part functions correctly before integrating it with others. This approach simplifies debugging and enhances the overall reliability of the system, as issues can be identified and resolved at an earlier stage. Additionally, vertical testability facilitates easier maintenance and updates, since changes in one layer can be tested independently without affecting the entire system.
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
by moving vertical
vertical is from side to side
A vertical line!