// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package mod import ( "io/ioutil" "os" "path/filepath" "testing" "golang.org/x/tools/internal/lsp/cache" "golang.org/x/tools/internal/lsp/tests" "golang.org/x/tools/internal/span" "golang.org/x/tools/internal/testenv" ) func TestMain(m *testing.M) { testenv.ExitIfSmallMachine() os.Exit(m.Run()) } // TODO(golang/go#36091): This file can be refactored to look like lsp_test.go // when marker support gets added for go.mod files. func TestModfileRemainsUnchanged(t *testing.T) { ctx := tests.Context(t) cache := cache.New(nil) session := cache.NewSession() options := tests.DefaultOptions() options.TempModfile = true options.Env = append(os.Environ(), "GOPACKAGESDRIVER=off", "GOROOT=") // Make sure to copy the test directory to a temporary directory so we do not // modify the test code or add go.sum files when we run the tests. folder, err := tests.CopyFolderToTempDir(filepath.Join("testdata", "unchanged")) if err != nil { t.Fatal(err) } defer os.RemoveAll(folder) before, err := ioutil.ReadFile(filepath.Join(folder, "go.mod")) if err != nil { t.Fatal(err) } _, snapshot, err := session.NewView(ctx, "diagnostics_test", span.FileURI(folder), options) if err != nil { t.Fatal(err) } if _, t := snapshot.View().ModFiles(); t == "" { return } after, err := ioutil.ReadFile(filepath.Join(folder, "go.mod")) if err != nil { t.Fatal(err) } if string(before) != string(after) { t.Errorf("the real go.mod file was changed even when tempModfile=true") } }