Fix test for fallback _readyClients. Fixes #4547

lib/mixins/property-effects.html

@@ -1507,14 +1507,14 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       }
 
       /**
-       * Overrides PropertyAccessor
+       * Overrides `PropertyAccessors` to call `_readyClients` callback
+       * if it was not called as a result of flushing properties.
        *
        * @override
        */
       ready() {
-        let dataPending = this.__dataPending;
         super.ready();
-        if (!dataPending) {
+        if (!this.__dataClientsInitialized) {
           this._readyClients();
         }
       }

test/unit/configure.html

@@ -296,9 +296,29 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     };
   </script>
 
+  <dom-module id="x-config-lazy-nodefaults">
+    <template>
+      <div>x-config-lazy-nodefaults</div>
+    </template>
+    <script>
+      window.XConfigLazyNoDefaults = {
+        is: 'x-config-lazy-nodefaults',
+        properties: {
+          prop: {
+            observer: 'propChanged'
+          }
+        },
+        created: function() {
+          this.propChanged = sinon.spy();
+        }
+      };
+    </script>
+  </dom-module>
+
   <dom-module id="x-config-lazy-host">
     <template>
       <x-config-lazy id="lazy" prop="{{foo}}" read-only-prop="{{foo}}" had-attr-prop="attrValue" bound-no-effect-prop="{{foo}}"></x-config-lazy>
+      <x-config-lazy-nodefaults prop="[[foo]]"></x-config-lazy-nodefaults>
     </template>
     <script>
     HTMLImports.whenReady(function() {
@@ -491,6 +511,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       var el = document.createElement('x-config-lazy-host');
       document.body.appendChild(el);
       Polymer(window.XConfigLazy);
+      Polymer(window.XConfigLazyNoDefaults);
       assert.equal(el.$.lazy.noEffectProp, 1);
       assert.equal(el.$.lazy.defaultUsesNoEffectProp, 2);
       assert.equal(el.$.lazy.boundNoEffectProp, 'foo');