---
title: "testing"
tags: 
- cosc202
---

# testing

- most software will contain bugs
- bug severity if not always equivalent to bug priority
- testing is seeking out bugs
- some test types
	- unit tests
	- integration tests ⇒ check units work together
	- end-to-end tests ⇒ check behaviour of whole program

## 1 Limitations
- testing every code path is impossible
	- halting problem - cant fully analyse code using code
	- proved by alan turing in 1936

- good test design focuses on _key cases_ to pass and fail
- not probe interaction between units
	- this should be done by integration testing

- testing may afffect behaviour of code
	- testing framework may affect the order of esecution
	- testing framework may change execution speed