1 files changed, 65 insertions, 0 deletions
diff --git a/gopls/internal/lsp/lsprpc/goenv_test.go b/gopls/internal/lsp/lsprpc/goenv_test.go
new file mode 100644
index 000000000..5edd64fbe
--- /dev/null
+++ b/gopls/internal/lsp/lsprpc/goenv_test.go
@@ -0,0 +1,65 @@
+// Copyright 2021 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 lsprpc_test
+
+import (
+	"context"
+	"testing"
+
+	"golang.org/x/tools/gopls/internal/lsp/protocol"
+
+	. "golang.org/x/tools/gopls/internal/lsp/lsprpc"
+)
+
+type initServer struct {
+	protocol.Server
+
+	params *protocol.ParamInitialize
+}
+
+func (s *initServer) Initialize(ctx context.Context, params *protocol.ParamInitialize) (*protocol.InitializeResult, error) {
+	s.params = params
+	return &protocol.InitializeResult{}, nil
+}
+
+func TestGoEnvMiddleware(t *testing.T) {
+	ctx := context.Background()
+
+	server := &initServer{}
+	env := new(TestEnv)
+	defer env.Shutdown(t)
+	l, _ := env.serve(ctx, t, staticServerBinder(server))
+	mw, err := GoEnvMiddleware()
+	if err != nil {
+		t.Fatal(err)
+	}
+	binder := mw(NewForwardBinder(l.Dialer()))
+	l, _ = env.serve(ctx, t, binder)
+	conn := env.dial(ctx, t, l.Dialer(), noopBinder, true)
+	dispatch := protocol.ServerDispatcherV2(conn)
+	initParams := &protocol.ParamInitialize{}
+	initParams.InitializationOptions = map[string]interface{}{
+		"env": map[string]interface{}{
+			"GONOPROXY": "example.com",
+		},
+	}
+	if _, err := dispatch.Initialize(ctx, initParams); err != nil {
+		t.Fatal(err)
+	}
+
+	if server.params == nil {
+		t.Fatalf("initialize params are unset")
+	}
+	envOpts := server.params.InitializationOptions.(map[string]interface{})["env"].(map[string]interface{})
+
+	// Check for an arbitrary Go variable. It should be set.
+	if _, ok := envOpts["GOPRIVATE"]; !ok {
+		t.Errorf("Go environment variable GOPRIVATE unset in initialization options")
+	}
+	// Check that the variable present in our user config was not overwritten.
+	if got, want := envOpts["GONOPROXY"], "example.com"; got != want {
+		t.Errorf("GONOPROXY=%q, want %q", got, want)
+	}
+}