tests: Test the simple* UDP ports more systematically

tox.ini

@@ -1,11 +1,7 @@
 [tox]
 ; py3.7 runs into aiocoap unrelated trouble in setups on Debian sid, leaving
 ; this to `setup.py test` for now
-;
-; uvloop is only tested on one recent version; it is not tested on pypy
-; because pypy support for uvloop is currently broken
-; <https://github.com/MagicStack/uvloop/issues/521>
-envlist = {py37,py38,py39,py310,py311,py312,pypy3}-{noextras,allextras},py311-uvloop
+envlist = {py37,py38,py39,py310,py311,py312,pypy3}-{noextras,allextras},py311-uvloop,py311-uvloop-simpleudp,pypy3-simpleudp
 skip_missing_interpreters = true
 
 [testenv]
@@ -36,6 +32,23 @@ setenv =
 
 [testenv:py311-uvloop]
 description = Running on uvloop
+deps =
+    coverage
+    pytest
+    uvloop
+extras =
+    all
+setenv =
+    AIOCOAP_TESTS_LOOP=uvloop
+
+; Not running the -simple versions everywhere to save some CI time.
+;
+; For the CPython part we're using the uvloop runner, because AFAIR there were
+; some extra workarounds. uvloop doesn't currently work with pypy, which gives
+; us the opportunity there to run it on some Python also without uvloop.
+
+[testenv:py311-uvloop-simpleudp]
+description = Running on uvloop with simple* UDP transports
 deps =
     coverage
     pytest
@@ -46,6 +59,19 @@ extras =
 ; alternative. that test could just as well be done on the default main loop,
 ; but AFAIR uvloop required occasional workarounds
 setenv =
+    AIOCOAP_DEFAULTS_EXPECT_ALL=1
     AIOCOAP_TESTS_LOOP=uvloop
     AIOCOAP_CLIENT_TRANSPORT=oscore:tinydtls:tcpclient:tlsclient:ws:simple6
     AIOCOAP_SERVER_TRANSPORT=oscore:tinydtls_server:tinydtls:tcpserver:tcpclient:tlsserver:tlsclient:ws:simplesocketserver
+
+[testenv:pypy3-simpleudp]
+description = Running pypy3 with simple UDP transports
+deps =
+    coverage
+    pytest
+extras =
+    all
+setenv =
+    AIOCOAP_DEFAULTS_EXPECT_ALL=1
+    AIOCOAP_CLIENT_TRANSPORT=oscore:tinydtls:tcpclient:tlsclient:ws:simple6
+    AIOCOAP_SERVER_TRANSPORT=oscore:tinydtls_server:tinydtls:tcpserver:tcpclient:tlsserver:tlsclient:ws:simplesocketserver