Convert dialect modules to relative imports and test

For some reason the dialects were not consistently
converted to relative imports.  Also added a test to
ensure that __all__ is functioning within each dialect.

Change-Id: I8450ed724473be7e17678e9aba7ba0f661fdf134

1 files changed, 18 insertions, 0 deletions

diff --git a/test/dialect/test_all.py b/test/dialect/test_all.py
new file mode 100644
index 000000000..3e028e87a
--- /dev/null
+++ b/test/dialect/test_all.py
@@ -0,0 +1,18 @@
+from sqlalchemy.testing import fixtures
+from sqlalchemy.testing import is_not_
+from sqlalchemy import dialects
+
+
+class ImportStarTest(fixtures.TestBase):
+
+    def _all_dialect_packages(self):
+        return [
+            getattr(__import__("sqlalchemy.dialects.%s" % d).dialects, d)
+            for d in dialects.__all__
+            if not d.startswith('_')
+        ]
+
+    def test_all_import(self):
+        for package in self._all_dialect_packages():
+            for item_name in package.__all__:
+                is_not_(None, getattr(package, item_name))