old_contents: import sys
  sys.path.append('..')
  import disaggregator as da
  import unittest
  import pandas as pd
  import numpy as np
  
  class ApplianceInstanceTestCase(unittest.TestCase):
  
      def setUp(self):
          indices = [pd.date_range('1/1/2013', periods=96, freq='15T'),
                     pd.date_range('1/2/2013', periods=96, freq='15T')]
          data = [np.zeros(96),np.zeros(96)]
          series = [pd.Series(d, index=i) for d,i in zip(data,indices)]
          self.traces = [da.ApplianceTrace(s,{}) for s in series]
          self.normal_instance = da.ApplianceInstance(self.traces)
  
      def test_get_traces(self):
          self.assertIsNotNone(self.normal_instance.get_traces(),
                        'instance should have traces')
  
  if __name__ == "__main__":
      unittest.main()
  
new_contents: import sys
  sys.path.append('..')
  import disaggregator as da
  import unittest
  import pandas as pd
  import numpy as np
  
  class ApplianceInstanceTestCase(unittest.TestCase):
  
      def setUp(self):
          indices = [pd.date_range('1/1/2013', periods=96, freq='15T'),
                     pd.date_range('1/2/2013', periods=96, freq='15T')]
          data = [np.zeros(96),np.zeros(96)]
          series = [pd.Series(d, index=i) for d,i in zip(data,indices)]
          self.traces = [da.ApplianceTrace(s,{}) for s in series]
          self.normal_instance = da.ApplianceInstance(self.traces)
  
      def test_get_traces(self):
          self.assertIsNotNone(self.normal_instance.get_traces(),
                        'instance should have traces')
  
      def test_traces_in_order(self):
          traces = self.normal_instance.get_traces()
          self.assertLess(traces[0].series.index[0],
                          traces[1].series.index[0],
                          'traces should be in order')
  
      def test_traces_should_not_overlap(self):
          traces = self.normal_instance.get_traces()
          times = set()
          for trace in traces:
              for time in trace.series.index:
                  self.assertNotIn(time, times,
                                   'traces should not overlap')
                  times.add(time)
  
  if __name__ == "__main__":
      unittest.main()
  
subject: update tests for appliance instances