def setUp(self): astrom_data = AstromParser().parse( self.get_abs_path("data/1616681p22.measure3.cands.astrom")) self.source = astrom_data.get_sources()[0] self.reading0 = self.source.get_reading(0) self.reading1 = self.source.get_reading(1) self.reading2 = self.source.get_reading(2) self.undertest = TripletFocusCalculator(self.source)