new_contents: import unittest
  import time
  from solr_doc_manager import SolrDocManager
  from pysolr import Solr
  
  class SolrDocManagerTester(unittest.TestCase):
  
      def __init__(self):
  
          super(SolrDocManagerTester, self).__init__()
          self.solr = Solr("http://localhost:8080/solr/")
  
      def runTest(self):
  
          #Invalid URL
          s = SolrDocManager("http://doesntexist.cskjdfhskdjfhdsom")
          self.assertTrue(s.solr is None)
  
          #valid URL
          SolrDoc = SolrDocManager("http://localhost:8080/solr/")
          self.solr.delete(q ='*:*')
  
  
          #test upsert
          docc = {'_id': '1', 'name': 'John'}
          SolrDoc.upsert([docc])
          self.solr.commit()
          res = self.solr.search('*:*')
          for doc in res:
              self.assertTrue(doc['_id'] == '1' and doc['name'] == 'John')
          
          docc = {'_id': '1', 'name': 'Paul'}
          SolrDoc.upsert([docc])
          self.solr.commit()
          res = self.solr.search('*:*')
          for doc in res:
              self.assertTrue(doc['_id'] == '1' and doc['name'] == 'Paul')
  
          #test remove
          SolrDoc.remove('1')
          self.solr.commit()
          res = self.solr.search('*:*')
          self.assertTrue(len(res) == 0)
  
          #test search
          docc = {'_id': '1', 'name': 'John'}
          SolrDoc.upsert([docc])
          docc = {'_id': '2', 'name': 'Paul'}
          SolrDoc.upsert([docc])
          self.solr.commit()
          search = SolrDoc.search('*:*')
          search2 = self.solr.search('*:*')
          self.assertTrue(len(search) == len(search2))
          self.assertTrue(len(search) != 0)
          for i in range(0,len(search)):
              self.assertTrue(list(search)[i] == list(search2)[i])
                      
          #test solr commit
          docc = {'_id': '3', 'name': 'Waldo'}
          SolrDoc.upsert([docc])
          res = SolrDoc.search('Waldo')
          assert(len(res) == 0)
          time.sleep(1)
          res = SolrDoc.search('Waldo')
          assert(len(res) != 0)
  
          #test get last doc
          docc = {'_id': '4', 'name': 'Hare', 'ts': '2'}
          SolrDoc.upsert([docc])
          docc = {'_id': '5', 'name': 'Tortoise', 'ts': '1'}
          SolrDoc.upsert([docc])
          self.solr.commit()
          doc = SolrDoc.get_last_doc()
          self.assertTrue(doc['_id'] == '4')
  
          docc = {'_id': '6', 'name': 'HareTwin', 'ts':'2'}
          self.solr.commit()
          doc = SolrDoc.get_last_doc()
          self.assertTrue(doc['_id'] == '4' or doc['_id'] == '6');
  
          
  
          
  
subject: add tester code