Program: 11324
Project: 11324
Buggy source:
@Test public void shouldMarshallDocumentUpdateCollection_withDocumentUpdateCollection() throws Exception {
  final String documentId1=randomString(10);
  final DocumentUpdate documentUpdate1=new DocumentUpdate(Type.ADD,documentId1);
  final String fieldName1a=randomString(10);
  final String fieldValue1a=randomString();
  final Field field1a=new Field(fieldName1a,fieldValue1a);
  final String fieldName1b=randomString(10);
  final String fieldValue1b=randomString();
  final Field field1b=new Field(fieldName1b,fieldValue1b);
  final Collection<Field> fields1=Arrays.asList(field1a,field1b);
  documentUpdate1.withFields(fields1);
  final String documentId2=randomString(10);
  final DocumentUpdate documentUpdate2=new DocumentUpdate(Type.ADD,documentId2);
  final String fieldName2a=randomString(10);
  final DateTime fieldValue2a=randomDateTime();
  final Field field2a=new Field(fieldName2a,fieldValue2a);
  final String fieldName2b=randomString(10);
  final String fieldValue2b=randomString();
  final Field field2b=new Field(fieldName2b,fieldValue2b);
  final Collection<Field> fields2=Arrays.asList(field2a,field2b);
  documentUpdate2.withFields(fields2);
  final String documentId3=randomString(10);
  final DocumentUpdate documentUpdate3=new DocumentUpdate(Type.DELETE,documentId3);
  final Collection<DocumentUpdate> documentUpdates=Arrays.asList(documentUpdate1,documentUpdate2,documentUpdate3);
  final String expectedJsonString="String_Node_Str" + documentId1 + "String_Node_Str"+ fieldName1a.toLowerCase()+ "String_Node_Str"+ fieldValue1a+ "String_Node_Str"+ fieldName1b.toLowerCase()+ "String_Node_Str"+ fieldValue1b+ "String_Node_Str"+ documentId2+ "String_Node_Str"+ fieldName2a.toLowerCase()+ "String_Node_Str"+ ISODateTimeFormat.dateTime().withZoneUTC().print(fieldValue2a)+ "String_Node_Str"+ fieldName2b.toLowerCase()+ "String_Node_Str"+ fieldValue2b+ "String_Node_Str"+ documentId3+ "String_Node_Str";
  final String jsonString=JsonDocumentUpdateMarshaller.marshall(documentUpdates);
  assertEquals(expectedJsonString,jsonString);
}

Fixed version (ground truth):
@Test public void shouldMarshallDocumentUpdateCollection_withDocumentUpdateCollection() throws Exception {
  final String documentId1=randomString(10);
  final DocumentUpdate documentUpdate1=new DocumentUpdate(Type.ADD,documentId1);
  final String fieldName1a=randomString(10);
  final String fieldValue1a=randomString();
  final Field field1a=new Field(fieldName1a,fieldValue1a);
  final String fieldName1b=randomString(10);
  final String fieldValue1b=randomString();
  final Field field1b=new Field(fieldName1b,fieldValue1b);
  final Collection<Field> fields1=Arrays.asList(field1a,field1b);
  documentUpdate1.withFields(fields1);
  final String documentId2=randomString(10);
  final DocumentUpdate documentUpdate2=new DocumentUpdate(Type.ADD,documentId2);
  final String fieldName2a=randomString(10);
  final DateTime fieldValue2a=randomDateTime();
  final Field field2a=new Field(fieldName2a,fieldValue2a);
  final String fieldName2b=randomString(10);
  final String fieldValue2b=randomString();
  final Field field2b=new Field(fieldName2b,fieldValue2b);
  final String fieldName2c=randomString(10);
  final boolean fieldValue2c=randomBoolean();
  final Field field2c=new Field(fieldName2c,fieldValue2c);
  final Collection<Field> fields2=Arrays.asList(field2a,field2b,field2c);
  documentUpdate2.withFields(fields2);
  final String documentId3=randomString(10);
  final DocumentUpdate documentUpdate3=new DocumentUpdate(Type.DELETE,documentId3);
  final Collection<DocumentUpdate> documentUpdates=Arrays.asList(documentUpdate1,documentUpdate2,documentUpdate3);
  final String expectedJsonString="String_Node_Str" + documentId1 + "String_Node_Str"+ fieldName1a.toLowerCase()+ "String_Node_Str"+ fieldValue1a+ "String_Node_Str"+ fieldName1b.toLowerCase()+ "String_Node_Str"+ fieldValue1b+ "String_Node_Str"+ documentId2+ "String_Node_Str"+ fieldName2a.toLowerCase()+ "String_Node_Str"+ ISODateTimeFormat.dateTime().withZoneUTC().print(fieldValue2a)+ "String_Node_Str"+ fieldName2b.toLowerCase()+ "String_Node_Str"+ fieldValue2b+ "String_Node_Str"+ fieldName2c.toLowerCase()+ "String_Node_Str"+ fieldValue2c+ "String_Node_Str"+ documentId3+ "String_Node_Str";
  final String jsonString=JsonDocumentUpdateMarshaller.marshall(documentUpdates);
  assertEquals(expectedJsonString,jsonString);
}