not entirely sure what the difference is here, but there's a difference

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Campbell, and my other patrons.  If you want to join them, you can
support my work at https://glyph.im/patrons/.

src/dbxs/test/common_adapter_tests.py

@@ -20,7 +20,7 @@ def __new__(
         bases = (
             ()
             if bases == tuple([TestCase])
-            else tuple([TestCase, CommonTests])
+            else tuple([CommonTests, TestCase])
         )
         return super().__new__(
             cls,

src/dbxs/test/test_mysql.py

@@ -4,6 +4,7 @@
 from dataclasses import dataclass
 from os import environ
 from typing import AsyncIterable
+from unittest import skipIf
 
 from twisted.trial.unittest import SynchronousTestCase as TestCase
 
@@ -116,10 +117,8 @@ async def _() -> None:
         get_event_loop().run_until_complete(_())
 
 
+@skipIf(cantFindMySQL, cantFindMySQL)
 class MySQLTests(CommonTests):
-    if cantFindMySQL:
-        skip = cantFindMySQL
-
     def createConnectable(self) -> AsyncConnectable:
         return adaptMySQL(configuredConnectAsync)
 

src/dbxs/test/test_pg.py

@@ -4,6 +4,7 @@
 from dataclasses import dataclass
 from os import environ
 from typing import AsyncIterable
+from unittest import skipIf
 
 from twisted.trial.unittest import SynchronousTestCase as TestCase
 
@@ -127,10 +128,8 @@ async def _() -> None:
         get_event_loop().run_until_complete(_())
 
 
+@skipIf(cantFindPG, cantFindPG)
 class PGTests(CommonTests):
-    if cantFindPG:
-        skip = cantFindPG
-
     def createConnectable(self) -> AsyncConnectable:
         return adaptPostgreSQL(AsyncConnection.connect)
 
@@ -142,3 +141,6 @@ def stringType(self) -> object:
 
     def valuesSQL(self) -> str:
         return "select * from (values (1, '2')) as named(firstcol, secondcol)"
+
+
+# print(PGTests.skip)