[impl/memory] Enforce named tasks during txn.

impl/memory/taskqueue_test.go

Index: impl/memory/taskqueue_test.go
diff --git a/impl/memory/taskqueue_test.go b/impl/memory/taskqueue_test.go
index db23c0c0aabce75ea7fec2db02d4c600bda72c06..d438e57fae88992a509e7dc03a8575e70c46f436 100644
--- a/impl/memory/taskqueue_test.go
+++ b/impl/memory/taskqueue_test.go
@@ -356,6 +356,8 @@ func TestTaskQueue(t *testing.T) {
 			})
 
 			Convey("unless you add too many things", func() {
+				t.Name = ""
+
 				So(ds.RunInTransaction(c, func(c context.Context) error {
 					for i := 0; i < 5; i++ {
 						So(tq.Add(c, "", t.Duplicate()), ShouldBeNil)
@@ -366,6 +368,8 @@ func TestTaskQueue(t *testing.T) {
 			})
 
 			Convey("unless you Add to a bad queue", func() {
+				t.Name = ""
+
 				So(ds.RunInTransaction(c, func(c context.Context) error {
 					So(tq.Add(c, "meat", t).Error(), ShouldContainSubstring, "UNKNOWN_QUEUE")
 
@@ -378,6 +382,16 @@ func TestTaskQueue(t *testing.T) {
 				}, nil), ShouldBeNil)
 			})
 
+			Convey("unless the task is named", func() {
+				So(ds.RunInTransaction(c, func(c context.Context) error {
+					err := tq.Add(c, "", t) // Note: "t" has a Name from initial Add.
+					So(err, ShouldNotBeNil)
+					So(err.Error(), ShouldContainSubstring, "INVALID_TASK_NAME")
+
+					return nil
+				}, nil), ShouldBeNil)
+			})
+
 			Convey("No other features are available, however", func() {
 				So(ds.RunInTransaction(c, func(c context.Context) error {
 					So(tq.Delete(c, "", t).Error(), ShouldContainSubstring, "cannot DeleteMulti from a transaction")