add ut for enhancement.

format tune.

revert betesting

define []byte("*") as allKeys, reuse it.

server/auth/store.go

@@ -43,7 +43,8 @@ var (
 	authEnabled   = []byte{1}
 	authDisabled  = []byte{0}
 
-	rootPerm = authpb.Permission{PermType: authpb.READWRITE, Key: []byte("*")}
+	allKeys  = []byte("*")
+	rootPerm = authpb.Permission{PermType: authpb.READWRITE, Key: allKeys, RangeEnd: []byte{0}}
 
 	revisionKey = []byte("authRevision")
 

server/auth/store_test.go

@@ -300,6 +300,28 @@ func TestUserGrant(t *testing.T) {
 	}
 }
 
+func TestGetRootRole(t *testing.T) {
+	as, tearDown := setupAuthStore(t)
+	defer tearDown(t)
+
+	perm := &authpb.Permission{
+		PermType: authpb.READWRITE,
+		Key:      allKeys,
+		RangeEnd: []byte{0},
+	}
+
+	//get root role
+	r, err := as.RoleGet(&pb.AuthRoleGetRequest{Role: "root"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	//check the role is root
+	if !reflect.DeepEqual(perm, r.Perm[0]) {
+		t.Errorf("expected %v, got %v", perm, r.Perm[0])
+	}
+}
+
 func TestHasRole(t *testing.T) {
 	as, tearDown := setupAuthStore(t)
 	defer tearDown(t)