fix listen once

src/keeper/Event.ts

@@ -26,10 +26,12 @@ export default class Event {
             this.interval)
     }
 
-    public async listenOnce() {
+    public listenOnce(callback: any) {
         this.listen((events: any[]) => {
-            EventListener.unsubscribe(this)
-            return events
+            if (events) {
+                EventListener.unsubscribe(this)
+                callback(events[0])
+            }
         })
     }
 

src/ocean/Ocean.ts

@@ -124,7 +124,7 @@ export default class Ocean {
 
         const storedDdo = await aquarius.storeDDO(ddo)
 
-        Logger.log(JSON.stringify(storedDdo, null, 2))
+        // Logger.log(JSON.stringify(storedDdo, null, 2))
 
         await didRegistry.registerAttribute(
             assetId,

test/keeper/Event.test.ts

@@ -52,19 +52,25 @@ describe("EventListener", () => {
 
     describe("#listenOnce()", () => {
 
-        xit("should listen once", async () => {
+        it("should listen once", (done) => {
 
             const acc = accounts[1]
 
+            const countBefore = EventListener.count()
             const event = EventListener.subscribe("OceanToken",
                 "Transfer",
                 {
                     to: acc.getId(),
                 })
 
-            const events = await event.listenOnce()
+            event.listenOnce(
+                (data: any) => {
 
-            assert(events, "no events")
+                    assert(data)
+                    assert(data.blockNumber)
+                    assert(EventListener.count() === countBefore)
+                    done()
+                })
 
             const {market} = keeper