Rational's numerator and denominator are read-only properties.

This will avoid setting the attributes of a tag's Rational value where the metadata container wouldn't be notified of the changes.

1 files changed, 15 insertions, 0 deletions

diff --git a/unittest/rational.py b/unittest/rational.py
index b10811d..990d282 100644
--- a/unittest/rational.py
+++ b/unittest/rational.py
@@ -36,6 +36,21 @@ class TestRational(unittest.TestCase):
         self.assertEqual(r.denominator, 1)
         self.assertRaises(ZeroDivisionError, Rational, 1, 0)
 
+    def test_read_only(self):
+        r = Rational(3, 4)
+        try:
+            r.numerator = 5
+        except AttributeError:
+            pass
+        else:
+            self.fail('Numerator is not read-only.')
+        try:
+            r.denominator = 5
+        except AttributeError:
+            pass
+        else:
+            self.fail('Denominator is not read-only.')
+
     def test_from_string(self):
         self.assertEqual(Rational.from_string('4/3'), Rational(4, 3))
         self.assertEqual(Rational.from_string('-4/3'), Rational(-4, 3))