unit test for precondition

CHANGELOG.md

@@ -3,7 +3,8 @@
 * more docs
 * fixed `MemoryErrorExceptionHandler` not being importable from `satella.exception_handling`
 * fixed the custom_hook for `MemoryErrorExceptionHandler`: it won't
-  kill everything if the custom_hook returns True 
+  kill everything if the custom_hook returns True
+* added an unit test for `precondition` 
 
 # v2.2.1
 

satella/__init__.py

 # coding=UTF-8
-__version__ = '2.2.2a5'
+__version__ = '2.2.2a6'

tests/test_coding/test_debug.py

@@ -17,6 +17,13 @@ class TestTypecheck(unittest.TestCase):
         self.assertRaises(PreconditionError, lambda: return_double([1], 2, 5))
         return_double([1], 1, 'dupa')
 
+    def test_precondition_fail(self):
+        @precondition('len(x) == 1', lambda x: x == 1, None, None, None)
+        def return_double(x, y, z):
+            pass
+
+        self.assertRaises(AssertionError, lambda: return_double([1], 1, 5))
+
     def test_forarg_kwords(self):
         @for_argument(int, typed=bool)
         def check(v1, typed='True'):