fixed test

theano/tensor/tests/test_extra_ops.py

@@ -139,6 +139,8 @@ class TestBinCountOp(utt.InferShapeTester):
                 f4 = theano.function([x], bincount(x, minlength=5))
                 assert (np.bincount(a, minlength=23) == f3(a)).all()
                 assert (np.bincount(a, minlength=5) == f4(a)).all()
+                # skip the following test when using unsigned ints
+                if not dtype.startswith('u'):
                     a[0] = -1
                     f5 = theano.function([x], bincount(x, assert_nonneg=True))
                     self.assertRaises(AssertionError, f5, a)