Add U.Builder.toString() method.

Author: javadev

src/main/java/com/github/underscore/lodash/U.java

@@ -2277,7 +2277,7 @@ public Builder set(final String path, final Object value) {
         }
 
         public Builder add(final Builder builder) {
-            data.putAll(builder.data);
+            data.put(String.valueOf(data.size()), builder.build());
             return this;
         }
 
@@ -2305,5 +2305,10 @@ public static Builder fromJson(final String json) {
             builder.data.putAll(fromJsonMap(json));
             return builder;
         }
+
+        @Override
+        public String toString() {
+            return data.toString();
+        }
     }
 }

src/test/java/com/github/underscore/lodash/LodashTest.java

@@ -763,7 +763,28 @@ public void objectBuilder() {
         builder.toXml();
         U.Builder.fromXml("<a/>");
         builder.set("1", "3");
+        builder.toString();
         assertEquals("{1=3}", builder.build().toString());
+        Map<String, Object> value = U.objectBuilder()
+            .add("firstName", "John")
+            .add("lastName", "Smith")
+            .add("age", 25)
+            .add("address", U.objectBuilder()
+                .add("streetAddress", "21 2nd Street")
+                .add("city", "New York")
+                .add("state", "NY")
+                .add("postalCode", "10021"))
+            .add("phoneNumber", U.objectBuilder()
+                .add(U.objectBuilder()
+                    .add("type", "home")
+                    .add("number", "212 555-1234"))
+                .add(U.objectBuilder()
+                    .add("type", "fax")
+                    .add("number", "646 555-4567")))
+            .build();
+        assertEquals("{firstName=John, lastName=Smith, age=25, address={streetAddress=21 2nd Street, "
+            + "city=New York, state=NY, postalCode=10021}, phoneNumber={0={type=home, number=212 555-1234}, "
+            + "1={type=fax, number=646 555-4567}}}", value.toString());
     }
 
     @SuppressWarnings("unchecked")