trying different approaches to test layout. in this one, the testing modules

become an externally usable package but still remains within the main sqlalchemy parent package.
in this system, we use kind of an ugly hack to get the noseplugin imported outside of the
"sqlalchemy" package, while still making it available within sqlalchemy for usage by
third party libraries.

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/sqlalchemy/testing/requirements.py b/lib/sqlalchemy/testing/requirements.py
new file mode 100644
index 000000000..eca883d4e
--- /dev/null
+++ b/lib/sqlalchemy/testing/requirements.py
@@ -0,0 +1,38 @@
+"""Global database feature support policy.
+
+Provides decorators to mark tests requiring specific feature support from the
+target database.
+
+"""
+
+from .exclusions import \
+     skip, \
+     skip_if,\
+     only_if,\
+     only_on,\
+     fails_on,\
+     fails_on_everything_except,\
+     fails_if,\
+     SpecPredicate,\
+     against
+
+def no_support(db, reason):
+    return SpecPredicate(db, description=reason)
+
+def exclude(db, op, spec, description=None):
+    return SpecPredicate(db, op, spec, description=description)
+
+
+def _chain_decorators_on(*decorators):
+    def decorate(fn):
+        for decorator in reversed(decorators):
+            fn = decorator(fn)
+        return fn
+    return decorate
+
+class Requirements(object):
+    def __init__(self, db, config):
+        self.db = db
+        self.config = config
+
+