diff --git a/tests/snippets/set.py b/tests/snippets/set.py
index 84754bca81..a7a20b0efb 100644
--- a/tests/snippets/set.py
+++ b/tests/snippets/set.py
@@ -1,4 +1,4 @@
-from testutils import assert_raises
+from testutils import assert_raises, assertRaises
assert set([1,2]) == set([1,2])
assert not set([1,2,3]) == set([1,2])
@@ -109,12 +109,8 @@ def __hash__(self):
a = set([1,2,3])
a |= set([3,4,5])
assert a == set([1,2,3,4,5])
-try:
+with assertRaises(TypeError):
a |= 1
-except TypeError:
- pass
-else:
- assert False, "TypeError not raised"
a = set([1,2,3])
a.intersection_update([2,3,4,5])
@@ -124,12 +120,8 @@ def __hash__(self):
a = set([1,2,3])
a &= set([2,3,4,5])
assert a == set([2,3])
-try:
+with assertRaises(TypeError):
a &= 1
-except TypeError:
- pass
-else:
- assert False, "TypeError not raised"
a = set([1,2,3])
a.difference_update([3,4,5])
@@ -139,12 +131,8 @@ def __hash__(self):
a = set([1,2,3])
a -= set([3,4,5])
assert a == set([1,2])
-try:
+with assertRaises(TypeError):
a -= 1
-except TypeError:
- pass
-else:
- assert False, "TypeError not raised"
a = set([1,2,3])
a.symmetric_difference_update([3,4,5])
@@ -154,9 +142,5 @@ def __hash__(self):
a = set([1,2,3])
a ^= set([3,4,5])
assert a == set([1,2,4,5])
-try:
+with assertRaises(TypeError):
a ^= 1
-except TypeError:
- pass
-else:
- assert False, "TypeError not raised"
diff --git a/tests/snippets/testutils.py b/tests/snippets/testutils.py
index 3c039f4f1e..8237ceb621 100644
--- a/tests/snippets/testutils.py
+++ b/tests/snippets/testutils.py
@@ -18,3 +18,19 @@ def assert_raises(exc_type, expr, msg=None):
if msg is not None:
failmsg += ': {!s}'.format(msg)
assert False, failmsg
+
+
+class assertRaises:
+ def __init__(self, expected):
+ self.expected = expected
+
+ def __enter__(self):
+ return self
+
+ def __exit__(self, exc_type, exc_val, exc_tb):
+ if exc_type is None:
+ failmsg = '{!s} was not raised'.format(self.expected.__name_)
+ assert False, failmsg
+ if not issubclass(exc_type, self.expected):
+ return False
+ return True
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