--- /dev/null
+// Copyright 2020 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 regtest
+
+import (
+ "path"
+ "strings"
+ "testing"
+
+ "golang.org/x/tools/internal/lsp/tests"
+)
+
+const internalDefinition = `
+-- go.mod --
+module mod.com
+
+go 1.12
+-- main.go --
+package main
+
+import "fmt"
+
+func main() {
+ fmt.Println(message)
+}
+-- const.go --
+package main
+
+const message = "Hello World."
+`
+
+func TestGoToInternalDefinition(t *testing.T) {
+ runner.Run(t, internalDefinition, func(t *testing.T, env *Env) {
+ env.OpenFile("main.go")
+ name, pos := env.GoToDefinition("main.go", env.RegexpSearch("main.go", "message"))
+ if want := "const.go"; name != want {
+ t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+ }
+ if want := env.RegexpSearch("const.go", "message"); pos != want {
+ t.Errorf("GoToDefinition: got position %v, want %v", pos, want)
+ }
+ })
+}
+
+const stdlibDefinition = `
+-- go.mod --
+module mod.com
+
+-- main.go --
+package main
+
+import "fmt"
+
+func main() {
+ fmt.Printf()
+}`
+
+func TestGoToStdlibDefinition_Issue37045(t *testing.T) {
+ runner.Run(t, stdlibDefinition, func(t *testing.T, env *Env) {
+ env.OpenFile("main.go")
+ name, pos := env.GoToDefinition("main.go", env.RegexpSearch("main.go", `fmt.(Printf)`))
+ if got, want := path.Base(name), "print.go"; got != want {
+ t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+ }
+
+ // Test that we can jump to definition from outside our workspace.
+ // See golang.org/issues/37045.
+ newName, newPos := env.GoToDefinition(name, pos)
+ if newName != name {
+ t.Errorf("GoToDefinition is not idempotent: got %q, want %q", newName, name)
+ }
+ if newPos != pos {
+ t.Errorf("GoToDefinition is not idempotent: got %v, want %v", newPos, pos)
+ }
+ })
+}
+
+func TestUnexportedStdlib_Issue40809(t *testing.T) {
+ runner.Run(t, stdlibDefinition, func(t *testing.T, env *Env) {
+ env.OpenFile("main.go")
+ name, _ := env.GoToDefinition("main.go", env.RegexpSearch("main.go", `fmt.(Printf)`))
+ env.OpenFile(name)
+
+ pos := env.RegexpSearch(name, `:=\s*(newPrinter)\(\)`)
+
+ // Check that we can find references on a reference
+ refs := env.References(name, pos)
+ if len(refs) < 5 {
+ t.Errorf("expected 5+ references to newPrinter, found: %#v", refs)
+ }
+
+ name, pos = env.GoToDefinition(name, pos)
+ content, _ := env.Hover(name, pos)
+ if !strings.Contains(content.Value, "newPrinter") {
+ t.Fatal("definition of newPrinter went to the incorrect place")
+ }
+ // And on the definition too.
+ refs = env.References(name, pos)
+ if len(refs) < 5 {
+ t.Errorf("expected 5+ references to newPrinter, found: %#v", refs)
+ }
+ })
+}
+
+// Test the hover on an error's Error function.
+// This can't be done via the marker tests because Error is a builtin.
+func TestHoverOnError(t *testing.T) {
+ const mod = `
+-- go.mod --
+module mod.com
+-- main.go --
+package main
+
+func main() {
+ var err error
+ err.Error()
+}`
+ run(t, mod, func(t *testing.T, env *Env) {
+ env.OpenFile("main.go")
+ content, _ := env.Hover("main.go", env.RegexpSearch("main.go", "Error"))
+ if content == nil {
+ t.Fatalf("nil hover content for Error")
+ }
+ want := "```go\nfunc (error).Error() string\n```"
+ if content.Value != want {
+ t.Fatalf("hover failed:\n%s", tests.Diff(want, content.Value))
+ }
+ })
+}