Added tests for EMPTY operator.

json-path/src/test/java/com/jayway/jsonpath/FilterTest.java

@@ -370,7 +370,7 @@ public class FilterTest extends BaseTest {
 
     //----------------------------------------------------------------------------
     //
-    // EMPTY
+    // NOT EMPTY
     //
     //----------------------------------------------------------------------------
     @Test
@@ -384,6 +384,29 @@ public class FilterTest extends BaseTest {
         assertThat(filter(where("null-key").notEmpty()).apply(createPredicateContext(json))).isEqualTo(false);
     }
 
+    //----------------------------------------------------------------------------
+    //
+    // EMPTY
+    //
+    //----------------------------------------------------------------------------
+    @Test
+    public void empty_evals() {
+        assertThat(filter(where("string-key").empty(false)).apply(createPredicateContext(json))).isEqualTo(true);
+        assertThat(filter(where("string-key").empty(true)).apply(createPredicateContext(json))).isEqualTo(false);
+
+        assertThat(filter(where("string-key-empty").empty(true)).apply(createPredicateContext(json))).isEqualTo(true);
+        assertThat(filter(where("string-key-empty").empty(false)).apply(createPredicateContext(json))).isEqualTo(false);
+
+        assertThat(filter(where("int-arr").empty(false)).apply(createPredicateContext(json))).isEqualTo(true);
+        assertThat(filter(where("int-arr").empty(true)).apply(createPredicateContext(json))).isEqualTo(false);
+
+        assertThat(filter(where("arr-empty").empty(true)).apply(createPredicateContext(json))).isEqualTo(true);
+        assertThat(filter(where("arr-empty").empty(false)).apply(createPredicateContext(json))).isEqualTo(false);
+
+        assertThat(filter(where("null-key").empty(true)).apply(createPredicateContext(json))).isEqualTo(false);
+        assertThat(filter(where("null-key").empty(false)).apply(createPredicateContext(json))).isEqualTo(false);
+    }
+
 
     //----------------------------------------------------------------------------
     //