test random number generator

dream/tests/testRandomNumberGenerator.py

+# ===========================================================================
+# Copyright 2014 Nexedi SA
+#
+# This file is part of DREAM.
+#
+# DREAM is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# DREAM is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with DREAM.  If not, see <http://www.gnu.org/licenses/>.
+# ===========================================================================
+
+from dream.simulation.RandomNumberGenerator import RandomNumberGenerator
+from unittest import TestCase
+
+from dream.simulation.Source import Source
+obj = Source(id='dummy_obj', name="Dummy obj to instanciate RNG")
+
+class RandomNumberGeneratorTestCase(TestCase):
+    def testFixed(self):
+        rng = RandomNumberGenerator(obj, distributionType='Fixed', mean=32)
+        self.assertEquals(rng.generateNumber(), 32)
+        self.assertEquals(rng.generateNumber(), 32)
+
+    def testExp(self):
+        rng = RandomNumberGenerator(obj, distributionType='Exp', avg=10)
+        number = rng.generateNumber()
+        # at least we make sure we generate a number
+        self.assertTrue(number >= 0)
+
+    def testErlang(self):
+        rng = RandomNumberGenerator(obj,
+            distributionType='Erlang', alpha=1, beta=2)
+        number = rng.generateNumber()
+        # at least we make sure we generate a number
+        self.assertTrue(number >= 0)
+
+    def testNormal(self):
+        rng = RandomNumberGenerator(obj,
+            distributionType='Normal',
+            min=0,
+            max=3,
+            stdev=.5,
+            avg=2)
+        for i in range(10):
+            number = rng.generateNumber()
+            self.assertTrue(number >= 0)
+            self.assertTrue(number <= 3)
+
+    def testNormalWrongParameter(self):
+        rng = RandomNumberGenerator(obj,
+            distributionType='Normal',
+            min=3,
+            max=0, # here min > max
+            stdev=.5,
+            avg=2)
+        self.assertRaises(ValueError, rng.generateNumber)
+
+    def testUnkonwnDistribution(self):
+        rng = RandomNumberGenerator(obj, distributionType='Unknown')
+        self.assertRaises(ValueError, rng.generateNumber)
+