Go comes with a test package that provides support for automated testing of Go packages.

The go test command automates the execution of any test function found in the *_test.go files corresponding to the package under test.

For a given file, say foo.go, the test is placed in a file called foo_test.go in the same package or in a separate test package.

The test file will be excluded from regular package builds, but will be included when the go test command is run.