Source Code for Module test_suite.unit_tests.test_float

  1  ############################################################################### 
  2  #                                                                             # 
  3  # Copyright (C) 2006 Gary Thompson                                            # 
  4  # Copyright (C) 2009 Edward d'Auvergne                                        # 
  5  #                                                                             # 
  6  # This file is part of the program relax.                                     # 
  7  #                                                                             # 
  8  # relax is free software; you can redistribute it and/or modify               # 
  9  # it under the terms of the GNU General Public License as published by        # 
 10  # the Free Software Foundation; either version 2 of the License, or           # 
 11  # (at your option) any later version.                                         # 
 12  #                                                                             # 
 13  # relax is distributed in the hope that it will be useful,                    # 
 14  # but WITHOUT ANY WARRANTY; without even the implied warranty of              # 
 15  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               # 
 16  # GNU General Public License for more details.                                # 
 17  #                                                                             # 
 18  # You should have received a copy of the GNU General Public License           # 
 19  # along with relax; if not, write to the Free Software                        # 
 20  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA   # 
 21  #                                                                             # 
 22  ############################################################################### 
 23   
 24  # Python module imports. 
 25  from unittest import TestCase 
 26  from float import * 
 27  from copy import copy 
 28   
 29   
 30  # Some constants for the tests. 
 31  FLOAT_EPSILON = packBytesAsPyFloat([1, 0, 0, 0, 0, 0, 0, 0]) 
 32  NEG_FLOAT_EPSILON = packBytesAsPyFloat([1, 0, 0, 0, 0, 0, 0, 128]) 
 33  FLOAT_NORMAL = packBytesAsPyFloat([0, 0, 0, 0, 128, 132, 46, 65]) 
 34  NEG_FLOAT_NORMAL = packBytesAsPyFloat([0, 0, 0, 0, 128, 132, 46, 193]) 
 35  ZERO = packBytesAsPyFloat([0, 0, 0, 0, 0, 0, 0, 0]) 
 36  NEG_ZERO = packBytesAsPyFloat([0, 0, 0, 0, 0, 0, 0, 128]) 
 37   
 38   
 39 -def make_dict_by_id(elements): 
 40      """Convert the list into a dictionary of pointer:value pairs.""" 
 41   
 42      # Convert. 
 43      result = {} 
 44      for element in elements: 
 45          result[id(element)] = element 
 46   
 47      # Return the dictionary. 
 48      return result 
 49   
 50   
 51 -def winnow_dist_to_list_by_id(dict, exclude): 
 52      """Generate a list of values in dict excluding the values given.""" 
 53   
 54      # Generate a new dictionary with the excluded values missing. 
 55      resultDict = copy(dict) 
 56      for val in exclude: 
 57          del(resultDict[id(val)]) 
 58   
 59      # Return as a list. 
 60      return list(resultDict.values()) 
 61   
 62   
 63 -class Test_float(TestCase): 
 64      """Unit tests for the functions of the 'float' module.""" 
 65   
 66      # A dictionary of all numerical types (the key is the memory address, i.e. this is like a pointer). 
 67      tests = make_dict_by_id([pos_inf, neg_inf, FLOAT_NORMAL, NEG_FLOAT_NORMAL, FLOAT_EPSILON, NEG_FLOAT_EPSILON, nan, ZERO, NEG_ZERO]) 
 68   
 69 -    def do_test_sets(self, function, true_class=[], false_class=[]): 
 70          """Method for checking all the values against the given function.""" 
 71   
 72          # The numbers that should return true. 
 73          for val in true_class: 
 74              self.assertEqual(function(val), True) 
 75   
 76          # The numbers that should return false. 
 77          for val in false_class: 
 78              self.assertEqual(function(val), False) 
 79   
 80   
 81 -    def test_getFloatClass(self): 
 82          """Test the float.getFloatClass() function.""" 
 83   
 84          tests = (CLASS_POS_INF,        pos_inf, 
 85                   CLASS_NEG_INF,        neg_inf, 
 86                   CLASS_POS_NORMAL,     FLOAT_NORMAL, 
 87                   CLASS_NEG_NORMAL,     -FLOAT_NORMAL, 
 88                   CLASS_POS_DENORMAL,   FLOAT_EPSILON, 
 89                   CLASS_NEG_DENORMAL,   -FLOAT_EPSILON, 
 90                   CLASS_QUIET_NAN,      nan, 
 91                   # WE DON'T USE SIGNAL NANS CLASS_SIGNAL_NAN, 
 92                   CLASS_POS_ZERO,       ZERO, 
 93                   CLASS_NEG_ZERO,       -ZERO 
 94          ) 
 95   
 96          i = iter(tests) 
 97          for (fpClass, value) in zip(i, i): 
 98              self.assertEqual(fpClass, getFloatClass(value)) 
 99   
100   
101 -    def test_isPositive(self): 
102          """Test the float.isZero() function.""" 
103   
104          # Negative values. 
105          negatives = (neg_inf, NEG_FLOAT_NORMAL, NEG_FLOAT_EPSILON, NEG_ZERO) 
106   
107          # Positive values. 
108          positives = winnow_dist_to_list_by_id(self.tests, negatives) 
109   
110          # Run the tests. 
111          self.do_test_sets(isPositive, true_class=positives, false_class=negatives) 
112   
113   
114 -    def test_isZero(self): 
115          """Test the float.isZero() function.""" 
116   
117          # The zeros. 
118          zeros = (ZERO, NEG_ZERO) 
119   
120          # All other numbers. 
121          non_zeros = winnow_dist_to_list_by_id(self.tests, zeros) 
122   
123          # Run the tests. 
124          self.do_test_sets(isZero, true_class=zeros, false_class=non_zeros) 
125