src/Tests/Unit/CensusTest.py

   1 import unittest
   2
   3 import Census
   4 import SummaryFile1
   5 import Tests.Fixtures
   6
   7
   8 class DatabaseTest(unittest.TestCase):
   9
  10     def setUp(self):
  11         self.cdb = Census.Database()
  12
  13
  14     def testEachBlockContainsItsOwnPopulation(self):
  15         # These calculations are slightly off due to a discrepancy
  16         # between the WKB/WKT format calculations. It would appear
  17         # that converting from WKB to WKT and then back loses some
  18         # information.
  19         #
  20         # The error is 1/100th of a person. Should be pretty safe.
  21         error_threshold = 0.01
  22
  23         grp = SummaryFile1.GeoRecordParser()
  24         fixtures_path = Tests.Fixtures.Path() + '/SummaryFile1/one_hundred_records.txt'
  25         fixtures = grp.parse_blocks(fixtures_path)
  26
  27         for b in fixtures:
  28             block_boundary = self.cdb.get_block_geometry_as_wkt(b.blkidfp00())
  29             contained_population = self.cdb.find_contained_population(block_boundary)
  30             error = abs(b.pop100 - contained_population)
  31             self.assertTrue(error <= error_threshold)
  32
  33
  34 def suite():
  35     suite = unittest.TestSuite()
  36     suite.addTest(unittest.makeSuite(DatabaseTest))
  37     return suite
  38