Catch the Lex error since Lex only supports 15s speech (#130)

* catch error and rethrow the error from Lex PostContent api when the recording speech is more than 15s

packages/amazon-sumerian-hosts-core/src/core/awspack/LexFeature.js

@@ -133,11 +133,16 @@ class LexFeature extends Messenger {
         }
         return resolve(data);
       });
-    }).then(data => {
-      this.emit(this.constructor.EVENTS.lexResponseReady, data);
-
-      return data;
-    });
+    })
+      .then(data => {
+        this.emit(this.constructor.EVENTS.lexResponseReady, data);
+        return data;
+      })
+      .catch(error => {
+        const errorMessage = `Error happened during voice recording: ${error}. Please check whether your speech is more than 15s.`;
+        console.error(errorMessage);
+        throw new Error(errorMessage);
+      });
   }
 
   _validateConfig(config) {
@@ -248,7 +253,6 @@ class LexFeature extends Messenger {
     }
 
     this.emit(this.constructor.EVENTS.recordEnd);
-
     return this._processWithAudio(result, this._audioContext.sampleRate);
   }
 

packages/amazon-sumerian-hosts-core/test/unit/awspack/LexFeature.spec.js

@@ -129,6 +129,22 @@ describeEnvironment('LexFeature', () => {
         {message: 'TestResponse'}
       );
     });
+
+    it('The error re-thrown from _process should be equal to the customize one.', async () => {
+      mockLexRuntime.postContent.and.callFake(function(param, callback) {
+        callback(new Error('mock error'), {message: 'TestResponse'});
+      });
+      lexFeature = new LexFeature(mockLexRuntime, {
+        botName: 'Bot',
+        botAlias: 'Alias',
+      });
+
+      await expectAsync(
+        lexFeature._process('TestType', 'TestInput', {})
+      ).toBeRejectedWithError(
+        'Error happened during voice recording: Error: mock error. Please check whether your speech is more than 15s.'
+      );
+    });
   });
 
   describe('enableMicInput', () => {