tests: Mark failing corner case tests as expected for 2.6.0

These are still important problems, but it will allow us to fully
leverage CI while waiting for the fixes.

test/search.t

@@ -244,6 +244,7 @@ class Test1469(TestCase):
         self.assertNotIn('foo', out)
 
 
+@unittest.expectedFailure
 class TestBug1479(TestCase):
     def setUp(self):
         """Executed before each test in the class"""