tg := testgo(t)
	tg.parallel()
	defer tg.cleanup()
	tg.makeTempdir()
	const testSrc = `package package_test
		import (
			"testing"
		)
		func TestTest(t *testing.T) {
		}`
	tg.tempFile("src/p1/p1_test.go", strings.Replace(testSrc, "package_test", "p1_test", 1))
	tg.tempFile("src/p2/p2_test.go", strings.Replace(testSrc, "package_test", "p2_test", 1))