if lerr := t.load(filepath.Join(ptest.Dir, file), "_xtest", &t.ImportXtest, &t.NeedXtest); lerr != nil && err == nil {
			err = lerr
		}
	}
	return t, err
}

// formatTestmain returns the content of the _testmain.go file for t.
func formatTestmain(t *testFuncs) ([]byte, error) {
	var buf bytes.Buffer
	tmpl := testmainTmpl
	if cfg.Experiment.CoverageRedesign {
		tmpl = testmainTmplNewCoverage
	}