What To and Not To Test – Mark Seemann

The Purpose of Testing

• To exercise the Api and the design. A hard class to test, is a poorly designed interface.
• To prevent regressions.

The Cost of Regressions

Dimensions of the Risk

• The likelihood the event.
• The impact of the event.

To reduce risk, you either decrease the likelihood or the impact of the event.

What is the impact of the error if happens? If it’s a dev app, there is almost zero risk. If it’s a Voyager probes. It could doom the project.