如何自动使测试在程序包中并行运行？

Question

I would like to run tests in a package in parallel. We know that the testing.Parallel function enables us to run two tests in a package in parallel, but is there a way to automatically enable all tests in a package to run in parallel without calling t.Parallel()?

For example, are there any flags I can throw into go test to make all tests with the function signature func(t *testing.T) be ran in parallel?

Answer 1

This comes from commit f80d8fb and Go1 (Oct. 2011)

An option (--parallel) was debated at the time, but quickly rejected:

Many tests won't work if run in parallel. (Many will, too.)
The presence of a --parallel flag means scripts and so on will want to turn it on, and tests must be able to protect themselves from erroneous runs.

I suggest whitelisting individual tests that are knowingly able to run in parallel, and the easiest way to do this is to name them differently.

I like t.Parallel.
It's clear which tests are parallel, it's not a global default, so you can apply it just to the tests where it is both appropriate and necessary, and the behavior is great: all the non-parallel run first - meaning the easy ones - and then the parallel ones can chew cpu.