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proposal: testing: per-test setup and teardown support #68354

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@PapaCharlie

This is a follow up issue for #27927 (comment), which discussed having an alternative mechanism to run tests from within TestMain. The proposal was the following:

func TestMain(m *testing.M) {
	setupAll()
	code := m.RunEach(func(t *testing.T) {
		setup(t)
		t.Run()
		teardown(t)
	})
	teardownAll()
	os.Exit(code)
}

Basically, testing.M should provide a way to iterate through the tests and allow code to be executed before and after each.

Originally posted by @mgwidmann in #27927 (comment)

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