1 files changed, 69 insertions, 0 deletions
diff --git a/gopls/internal/regtest/misc/signature_help_test.go b/gopls/internal/regtest/misc/signature_help_test.go
new file mode 100644
index 000000000..fd9f4f07a
--- /dev/null
+++ b/gopls/internal/regtest/misc/signature_help_test.go
@@ -0,0 +1,69 @@
+// Copyright 2023 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 misc
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"golang.org/x/tools/gopls/internal/lsp/protocol"
+	. "golang.org/x/tools/gopls/internal/lsp/regtest"
+)
+
+func TestSignatureHelpInNonWorkspacePackage(t *testing.T) {
+	const files = `
+-- a/go.mod --
+module a.com
+
+go 1.18
+-- a/a/a.go --
+package a
+
+func DoSomething(int) {}
+
+func _() {
+	DoSomething()
+}
+-- b/go.mod --
+module b.com
+go 1.18
+
+require a.com v1.0.0
+
+replace a.com => ../a
+-- b/b/b.go --
+package b
+
+import "a.com/a"
+
+func _() {
+	a.DoSomething()
+}
+`
+
+	WithOptions(
+		WorkspaceFolders("a"),
+	).Run(t, files, func(t *testing.T, env *Env) {
+		env.OpenFile("a/a/a.go")
+		env.OpenFile("b/b/b.go")
+		signatureHelp := func(filename string) *protocol.SignatureHelp {
+			loc := env.RegexpSearch(filename, `DoSomething\(()\)`)
+			var params protocol.SignatureHelpParams
+			params.TextDocument.URI = loc.URI
+			params.Position = loc.Range.Start
+			help, err := env.Editor.Server.SignatureHelp(env.Ctx, &params)
+			if err != nil {
+				t.Fatal(err)
+			}
+			return help
+		}
+		ahelp := signatureHelp("a/a/a.go")
+		bhelp := signatureHelp("b/b/b.go")
+
+		if diff := cmp.Diff(ahelp, bhelp); diff != "" {
+			t.Fatal(diff)
+		}
+	})
+}