What Is a Test?
The Oxford English Dictionary defines the noun test as: “a procedure intended to establish the quality, performance, or reliability of something, especially before it is taken into widespread use.”
In the context of software development, we can adapt the definition to: “a procedure intended to establish the software quality, performance, or reliability, especially before it is shipped to the users.”
To test our software essentially means to run it and verify it behaves as desired.
Take this “Hello, world!” script, for example:
#!/usr/bin/env xcrun swift
func main
