go test <package>

The testing story in Go is very cool. There are much things to uncover and learn when working with tests in Go. With the command go test you can use package as a filter when running the tests.

go test my_package 

You can read more about that command here, test packages.

One (of many) interesting thing with Go is when you install it on your machine, the source code for the standard library is included in the installation. This source code is valuable for reference, understanding how the standard library is implemented, and debugging purposes. It typically resides in the src directory within the Go installation path.

This enable us to run the tests for the standard packages also.

go test fmt ok fmt 0.120s # or go test net/http ok net/http 66.037s 

Nice, and you will be able to run this command in any folder! By using the verbose flag, -v, you will get a hint of what is being tested in each package, which is neat.

go test -v fmt === RUN TestErrorf --- PASS: TestErrorf (0.00s) === RUN TestFmtInterface --- PASS: TestFmtInterface (0.00s) === RUN TestSprintf --- PASS: TestSprintf (0.00s) === RUN TestComplexFormatting --- PASS: TestComplexFormatting (0.00s) === RUN TestReorder --- PASS: TestReorder (0.00s) === RUN TestCountMallocs fmt_test.go:1451: skipping; GOMAXPROCS>1 --- SKIP: TestCountMallocs (0.00s) === RUN TestFlagParser --- PASS: TestFlagParser (0.00s) ... ... === RUN ExampleStringer --- PASS: ExampleStringer (0.00s) 

This could be a fun way to explore and understand how the standard packages are built in Go.

Happy exploring!