Merge pull request #23 from jorisadri/iss22

#22 Fix handle error websocket

Author: Grégory Saive

src/infrastructure/Listener.ts

@@ -104,6 +104,7 @@ export class Listener {
                 this.webSocket.onerror = (err) => {
                     console.log('WebSocket Error ');
                     console.log(err);
+                    reject(err);
                 };
                 this.webSocket.onmessage = (msg) => {
                     const message = JSON.parse(msg.data as string);
@@ -155,6 +156,17 @@ export class Listener {
         });
     }
 
+  /**
+     * returns a boolean that repressents the open state
+     * @returns a boolean
+     */
+    public isOpen(): boolean {
+        if(this.webSocket){
+            return this.webSocket.readyState === WebSocket.OPEN;
+        }
+        return false;
+    }
+    
     /**
      * Close web socket connection.
      * @returns void

test/infrastructure/Listener.spec.ts

@@ -23,4 +23,25 @@ describe('Listener', () => {
         expect('ws://localhost:3000/ws').to.be.equal(listener.url);
         listener.close();
     });
+
+    describe('isOpen', () => {
+        it('should return false when listener is created and not opened', () => {
+            const listener = new Listener('ws://localhost:3000');
+            expect(listener.isOpen()).to.be.false;
+            listener.close();
+        });
+    });
+
+    describe('onerror', () => {
+        it('should reject because of wrong server url', async () => {
+            const listener = new Listener('https://notcorrecturl:0000');
+            await listener.open()
+                .then((result) => {
+                    throw new Error('This should not be called when expecting error');
+                })
+                .catch((error) => {
+                    expect(error.toString()).to.be.equal("Error: getaddrinfo ENOTFOUND notcorrecturl notcorrecturl:0000");
+                })
+        });
+    });
 });