Implement a server-side config service interface.

server/config/authority_test.go

Index: server/config/authority_test.go
diff --git a/server/config/authority_test.go b/server/config/authority_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..efccdad2b058b7b411fc4fe3e4e13b52f5c3e9a5
--- /dev/null
+++ b/server/config/authority_test.go
@@ -0,0 +1,24 @@
+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package config
+
+import (
+	"testing"
+
+	"github.com/luci/luci-go/server/auth"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestAuthorityRPCTranslation(t *testing.T) {
+	t.Parallel()
+
+	Convey(`Testing authority RPC kind translation`, t, func() {
+		So(AsAnonymous.rpcAuthorityKind(), ShouldEqual, auth.NoAuth)
+		So(AsUser.rpcAuthorityKind(), ShouldEqual, auth.AsUser)
+		So(AsService.rpcAuthorityKind(), ShouldEqual, auth.AsSelf)
+		So(func() { Authority(-1).rpcAuthorityKind() }, ShouldPanic)
+	})
+}