Fix assertRaises when the exception has a metaclass

Due to not taking into account that the type of the class can be a
subclass of type (which is the case when using metaclasses),
assertRaises would report a false positive in case an exception that was
expected had a custom metaclass.

This patch introduces a more robust checking if a given object is a
class or an instance of one, and adds a test case, to make sure
exceptions with custom metaclasses don't break assertRaises.

1 files changed, 1 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
index d59dc7c..21010cc 100644
--- a/LICENSE
+++ b/LICENSE
@@ -17,6 +17,7 @@ The testtools authors are:
  * Gavin Panella
  * Martin Pool
  * Vincent Ladeuil
+ * Nikola Đipanov
 
 and are collectively referred to as "testtools developers".