Add another test

src/test/java/org/json/junit/JSONPointerTest.java

@@ -75,6 +75,14 @@ public class JSONPointerTest {
         );
     }
     
+    @Test
+    public void queryByEmptyKeySubObjectValue() {
+        assertSame(
+            document.getJSONObject("obj").getJSONObject("").get("subKey"),
+            query("/obj//subKey")
+        );
+    }
+
     @Test
     public void slashEscaping() {
         assertSame(document.get("a/b"), query("/a~1b"));

src/test/resources/jsonpointer-testdoc.json

@@ -20,6 +20,9 @@
 				"val"
 			]
 		},
-		"" : { "" : "empty key of an object with an empty key" }
+		"" : {
+		    "" : "empty key of an object with an empty key",
+		    "subKey" : "Some other value"
+		}
 	}
 }