Add server/cache support to gaeconfig.

milo/appengine/settings/config_test.go

Index: milo/appengine/settings/config_test.go
diff --git a/milo/appengine/settings/config_test.go b/milo/appengine/settings/config_test.go
index f886ff717f9a99e457773c898b05b462243376ca..4125131f5b2f1adcaf96a526cc763c5704309002 100644
--- a/milo/appengine/settings/config_test.go
+++ b/milo/appengine/settings/config_test.go
@@ -9,9 +9,10 @@ import (
 	"testing"
 
 	"github.com/luci/gae/impl/memory"
-	lucicfg "github.com/luci/luci-go/common/config"
 	memcfg "github.com/luci/luci-go/common/config/impl/memory"
 	"github.com/luci/luci-go/common/logging/gologger"
+	"github.com/luci/luci-go/luci_config/server/cfgclient/backend/testconfig"
+
 	"golang.org/x/net/context"
 
 	. "github.com/smartystreets/goconvey/convey"
@@ -23,9 +24,9 @@ func TestConfig(t *testing.T) {
 	Convey("Test Environment", t, func() {
 		c := memory.UseWithAppID(context.Background(), "dev~luci-milo")
 		c = gologger.StdConfig.Use(c)
+		c = testconfig.WithCommonClient(c, memcfg.New(mockedConfigs))
 
 		Convey("Send update", func() {
-			c = lucicfg.SetImplementation(c, memcfg.New(mockedConfigs))
 			// Send update here
 			err := Update(c)
 			So(err, ShouldBeNil)
@@ -48,7 +49,7 @@ func TestConfig(t *testing.T) {
 
 		Convey("Reject duplicate configs.", func() {
 			mockedConfigs["projects/bar.git"] = memcfg.ConfigSet{"luci-milo.cfg": barCfg}
-			c = lucicfg.SetImplementation(c, memcfg.New(mockedConfigs))
+
 			err := Update(c)
 			So(strings.HasPrefix(err.Error(), "Duplicate project ID"), ShouldEqual, true)
 		})