impl/memory: Disallow empty namespace.

impl/memory/info_test.go

Index: impl/memory/info_test.go
diff --git a/impl/memory/info_test.go b/impl/memory/info_test.go
index 200f43764962e5d6d044fb5658c346ba61d3bdd5..07fcd09486f49fc46b9fdfa4427417ce73cdcdc1 100644
--- a/impl/memory/info_test.go
+++ b/impl/memory/info_test.go
@@ -5,6 +5,7 @@
 package memory
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/luci/gae/service/info"
@@ -18,12 +19,22 @@ func TestMustNamespace(t *testing.T) {
 		c := Use(context.Background())
 		i := info.Get(c)
 
-		So(func() {
-			i.MustNamespace("valid_namespace_name")
-		}, ShouldNotPanic)
-		So(func() {
-			i.MustNamespace("invalid namespace name")
-		}, ShouldPanic)
+		for _, ns := range []string{
+			"valid_namespace_name",
+		} {
+			Convey(fmt.Sprintf("%q is a valid namespace.", ns), func() {
+				So(func() { i.MustNamespace(ns) }, ShouldNotPanic)
+			})
+		}
+
+		for _, ns := range []string{
+			"",
+			"invalid namespace name",
+		} {
+			Convey(fmt.Sprintf("%q is an invalid namespace.", ns), func() {
+				So(func() { i.MustNamespace(ns) }, ShouldPanic)
+			})
+		}
 	})
 
 	Convey("Testable interface works", t, func() {