Writing Go tests

A Go test file is simply a set of functions with the following signature:

func Test<Name>(*testing.T)

Here, <Name> is an arbitrary name that reflects the purpose of the test. The test functions are intended to exercise a specific functional unit (or unit test) of the source code.

Before we write the test functions, let us review the code that will be tested. The following source snippet shows a simple implementation of a mathematical vector with Add, Sub, and Scale methods (see the full source code listed at https://github.com/vladimirvivien/learning-go/ch12/vector/vec.go). Notice that each method implements a specific behavior as a unit of functionality, which will make it easy to test:

type Vector interface { Add(other Vector) Vector ...

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