testenv.MustHaveExternalNetwork(t)
	testenv.MustHaveExecPath(t, "git")

	oldAllowMissingModuleImports := allowMissingModuleImports
	oldRootMode := RootMode
	defer func() {
		allowMissingModuleImports = oldAllowMissingModuleImports
		RootMode = oldRootMode
	}()
	allowMissingModuleImports = true
	RootMode = NoRoot

	ctx := context.Background()
	rs := LoadModFile(ctx)

	for _, tt := range importTests {

		// before loading packages, since it affects package locations, e.g.,
		// for -race and -msan.
		modload.ForceUseModules = true
		modload.RootMode = modload.NoRoot
		modload.AllowMissingModuleImports()
		modload.Init()
	} else {
		modload.InitWorkfile()
	}

	work.BuildInit()
	b := work.NewBuilder("")
	defer func() {
		if err := b.Close(); err != nil {
			base.Fatal(err)
		}
	}()