update issue 628

json-path/src/test/java/com/jayway/jsonpath/internal/function/Issue628.java

@@ -3,18 +3,39 @@ package com.jayway.jsonpath.internal.function;
 import com.jayway.jsonpath.Configuration;
 import com.jayway.jsonpath.JsonPath;
 import com.jayway.jsonpath.Option;
+import com.jayway.jsonpath.Predicate;
 import org.junit.Test;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 
 import static org.junit.Assert.assertNull;
 
 public class Issue628 {
 
     @Test
-    public void nonexistant_property_returns_null_when_configured() {
+    public void empty_property_returns_null_when_configured() {
         String document = "{}";
         Configuration config = Configuration.builder().options(Option.SUPPRESS_EXCEPTIONS).build();
         String nonExistentPath = "$.doesNotExist";
 
         assertNull(JsonPath.read(config.jsonProvider().parse(document), nonExistentPath));
     }
+
+    @Test
+    public void empty_array_can_be_filtered(){
+        Map<String, Object> doc = new HashMap<String, Object>();
+
+        Predicate customFilter = new Predicate() {
+            @Override
+            public boolean apply(PredicateContext ctx) {
+                return 1 == (Integer)ctx.item();
+            }
+        };
+
+        List<Integer> res = JsonPath.read(doc, "$.items[?]", customFilter);
+
+        assertNull(res);
+    }
 }