add property choice to xml, sentiment nodes

add tests

nodes/core/analysis/72-sentiment.html

@@ -1,20 +1,9 @@
-<!--
-  Copyright JS Foundation and other contributors, http://js.foundation
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-  http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
--->
 
 <script type="text/x-red" data-template-name="sentiment">
+    <div class="form-row">
+        <label for="node-input-property"><i class="fa fa-ellipsis-h"></i> <span data-i18n="node-red:common.label.property"></span></label>
+        <input type="text" id="node-input-property" style="width:70%;"/>
+    </div>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
         <input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
@@ -22,7 +11,7 @@
 </script>
 
 <script type="text/x-red" data-help-name="sentiment">
-    <p>Analyses the <code>payload</code> and adds a <code>sentiment</code> object.</p>
+    <p>Analyses the chosen property, default <code>payload</code>, and adds a <code>sentiment</code> object.</p>
     <h3>Outputs</h3>
     <dl class="message-properties">
         <dt>sentiment <span class="property-type">object</span></dt>
@@ -47,6 +36,7 @@
         color:"#E6E0F8",
         defaults: {
             name: {value:""},
+            property: {value:"payload",required:true}
         },
         inputs:1,
         outputs:1,
@@ -56,6 +46,12 @@
         },
         labelStyle: function() {
             return this.name?"node_label_italic":"";
+        },
+        oneditprepare: function() {
+            if (this.property === undefined) {
+                $("#node-input-property").val("payload");
+            }
+            $("#node-input-property").typedInput({default:'msg',types:['msg']});
         }
     });
 </script>