cmd/protoc-gen-go/testdata: add registry test
This test verifies that the inialization logic does not accidentally
execute the lazy initialization logic that is intended to only evaluate
upon first use.
Change-Id: I5e9dea17ce88081c78195af0e86dd38223689f63
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/184259
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/cmd/protoc-gen-go/testdata/registry_test.go b/cmd/protoc-gen-go/testdata/registry_test.go
new file mode 100644
index 0000000..140b4aa
--- /dev/null
+++ b/cmd/protoc-gen-go/testdata/registry_test.go
@@ -0,0 +1,27 @@
+// 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 main
+
+import (
+ "testing"
+
+ "google.golang.org/protobuf/internal/filedesc"
+ "google.golang.org/protobuf/reflect/protoreflect"
+ "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+func TestRegistry(t *testing.T) {
+ var hasFiles bool
+ protoregistry.GlobalFiles.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
+ if fd.(*filedesc.File).L2 != nil {
+ t.Errorf("file %q eagerly went through lazy initialization", fd.Path())
+ }
+ hasFiles = true
+ return true
+ })
+ if !hasFiles {
+ t.Errorf("protoregistry.GlobalFiles is empty")
+ }
+}
