Added some NumberRange tests

sqlalchemy_utils/types.py

@@ -84,7 +84,7 @@ class NumberRangeType(types.TypeDecorator):
     impl = NumberRangeRawType
 
     def process_bind_param(self, value, dialect):
-        return value
+        return str(value)
 
     def process_result_value(self, value, dialect):
         return NumberRange.from_normalized_str(value)
@@ -97,6 +97,23 @@ class NumberRange(object):
 
     @classmethod
     def from_normalized_str(cls, value):
+        """
+        Returns new NumberRange object from normalized number range format.
+
+        Example ::
+
+            range = NumberRange.from_normalized_str('[23, 45]')
+            range.min_value = 23
+            range.max_value = 45
+
+            range = NumberRange.from_normalized_str('(23, 45]')
+            range.min_value = 24
+            range.max_value = 45
+
+            range = NumberRange.from_normalized_str('(23, 45)')
+            range.min_value = 24
+            range.max_value = 44
+        """
         if value is not None:
             values = value[1:-1].split(',')
             min_value, max_value = map(
@@ -120,6 +137,15 @@ class NumberRange(object):
             )
             return cls(min_value, max_value)
 
+    def __eq__(self, other):
+        try:
+            return (
+                self.min_value == other.min_value and
+                self.max_value == other.max_value
+            )
+        except AttributeError:
+            return NotImplemented
+
     def __repr__(self):
         return 'NumberRange(%r, %r)' % (self.min_value, self.max_value)
 

tests/test_number_range.py

@@ -0,0 +1,36 @@
+import sqlalchemy as sa
+from sqlalchemy_utils import NumberRangeType, NumberRange
+from tests import DatabaseTestCase
+
+
+class TestNumberRangeType(DatabaseTestCase):
+    def create_models(self):
+        class Building(self.Base):
+            __tablename__ = 'building'
+            id = sa.Column(sa.Integer, primary_key=True)
+            persons_at_night = sa.Column(NumberRangeType)
+
+            def __repr__(self):
+                return 'Building(%r)' % self.id
+
+        self.Building = Building
+
+    def test_save_number_range(self):
+        building = self.Building(
+            persons_at_night=NumberRange(1, 3)
+        )
+
+        self.session.add(building)
+        self.session.commit()
+
+        building = self.session.query(self.Building).first()
+        assert building.persons_at_night.min_value == 1
+        assert building.persons_at_night.max_value == 3
+
+
+class TestNumberRange(object):
+    def test_equality_operator(self):
+        assert NumberRange(1, 3) == NumberRange(1, 3)
+
+    def test_str_representation(self):
+        assert str(NumberRange(1, 3)) == '[1, 3]'