[dylanpulver]

tests/test_async.py has three DoH3 tests next to each other:

585:    def testDoH3GetRequest(self):
603:    def TestDoH3PostRequest(self):
621:    def TestDoH3QueryIP(self):

The first runs. The other two are spelled with a capital T, so neither
unittest nor pytest collects them, and they have never run.

Reviving them does not change what the suite reaches out to. AsyncTests
is already gated by @unittest.skipIf(not tests.util.is_internet_reachable()),
each of the three carries @unittest.skipIf(not dns.quic.have_quic) and
@tests.util.retry_on_timeout, and testDoH3GetRequest already queries a
public DoH3 resolver.

The second one does not pass on a rename alone

TestDoH3QueryIP is missing the await that both of its siblings have:

r = dns.asyncquery.https(
    q,
    nameserver_ip,
    post=False,
    timeout=4,
    http_version=dns.asyncquery.HTTPVersion.H3,
)
self.assertTrue(q.is_response(r))

So r is a coroutine and the assertion fails:

E       AttributeError: 'coroutine' object has no attribute 'flags'
dns/message.py:321: AttributeError

This adds the await, so the test checks the response rather than the
coroutine object.

Verification

With aioquic installed and the internet reachable:

• tests/test_async.py collects 83 tests before and 87 after. The four are
  the two methods times AsyncTests and TrioAsyncTests, which subclasses it.
• Renaming only, without the await, gives 2 failed and 4 passed on
  -k DoH3, and both failures are testDoH3QueryIP.
• With the await, -k DoH3 is 6 passed.
• tests/test_async.py as a whole is 81 passed, 6 skipped.
• Full suite goes from 1734 passed to 1738 passed. Seven failures are
  identical before and after on 5adedf1a, in test_zone.py and
  test_tsig_doh_doq.py, so they are unrelated to this change.
• black --check tests/test_async.py is clean.