config: Add Integer ConfigValue and tests.

mopidy/utils/config.py

@@ -81,3 +81,12 @@ class String(ConfigValue):
 
     def serialize(self, value):
         return value.strip()
+
+
+class Integer(ConfigValue):
+    def deserialize(self, value):
+        value = int(value.strip())
+        validate_choice(value, self.choices)
+        validate_minimum(value, self.minimum)
+        validate_maximum(value, self.maximum)
+        return value

tests/utils/config_test.py

@@ -109,3 +109,40 @@ class StringTest(unittest.TestCase):
     def test_format_masks_secrets(self):
         value = config.String(secret=True)
         self.assertEqual('********', value.format('s3cret'))
+
+
+class IntegerTest(unittest.TestCase):
+    def test_deserialize_converts_to_int(self):
+        value = config.Integer()
+        self.assertEqual(123, value.deserialize('123'))
+        self.assertEqual(0, value.deserialize('0'))
+        self.assertEqual(-10, value.deserialize('-10'))
+
+    def test_deserialize_fails_on_bad_data(self):
+        value = config.Integer()
+        with self.assertRaises(ValueError):
+            value.deserialize('asd')
+        with self.assertRaises(ValueError):
+            value.deserialize('3.14')
+
+    def test_deserialize_enforces_choices(self):
+        value = config.Integer(choices=[1, 2, 3])
+        self.assertEqual(3, value.deserialize('3'))
+        with self.assertRaises(ValueError):
+            value.deserialize('5')
+
+    def test_deserialize_enforces_minimum(self):
+        value = config.Integer(minimum=10)
+        self.assertEqual(15, value.deserialize('15'))
+        with self.assertRaises(ValueError):
+            value.deserialize('5')
+
+    def test_deserialize_enforces_maximum(self):
+        value = config.Integer(maximum=10)
+        self.assertEqual(5, value.deserialize('5'))
+        with self.assertRaises(ValueError):
+            value.deserialize('15')
+
+    def test_format_masks_secrets(self):
+        value = config.Integer(secret=True)
+        self.assertEqual('********', value.format('1337'))