add a couple dice roller tests

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

tests/test_dice_roller.py

@@ -0,0 +1,30 @@
+"""Test the dice parsing and generator."""
+from unittest import mock
+
+from django.test import TestCase
+
+import dice.roller
+
+
+class DiceRollerTestCase(TestCase):
+    """Test that a variety of dice rolls can be parsed."""
+
+    def setUp(self):
+        """Create the dice roller."""
+        self.roller = dice.roller.DiceRoller()
+
+    def test_standard_rolls(self):
+        """Roll a variety of normal rolls."""
+        with mock.patch('random.randint', return_value=5):
+            result = self.roller.do_roll('1d20')
+        self.assertEqual(result, '5 (5[5])')
+
+        with mock.patch('random.randint', side_effect=[5, 6]):
+            result = self.roller.do_roll('2d20')
+        self.assertEqual(result, '11 (11[5,6])')
+
+        with mock.patch('random.randint', side_effect=[1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
+                                                       4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6]):
+            result = self.roller.do_roll('6#3/4d6')
+        self.assertEqual(result, '3 (3[1,1,1,1]), 6 (6[2,2,2,2]), 9 (9[3,3,3,3]), '
+                         '12 (12[4,4,4,4]), 15 (15[5,5,5,5]), 18 (18[6,6,6,6])')