--- /dev/null
+// 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 cmdtest
+
+import (
+ "fmt"
+ "testing"
+
+ "golang.org/x/tools/internal/lsp/protocol"
+ "golang.org/x/tools/internal/span"
+)
+
+func (r *runner) SignatureHelp(t *testing.T, spn span.Span, want *protocol.SignatureHelp) {
+ uri := spn.URI()
+ filename := uri.Filename()
+ target := filename + fmt.Sprintf(":%v:%v", spn.Start().Line(), spn.Start().Column())
+ got, _ := r.NormalizeGoplsCmd(t, "signature", target)
+ if want == nil {
+ if got != "" {
+ t.Fatalf("want nil, but got %s", got)
+ }
+ return
+ }
+ goldenTag := want.Signatures[0].Label + "-signature"
+ expect := string(r.data.Golden(goldenTag, filename, func() ([]byte, error) {
+ return []byte(got), nil
+ }))
+ if expect != got {
+ t.Errorf("signature failed for %s expected:\n%q\ngot:\n%q'", filename, expect, got)
+ }
+}