$ cd lang/python
$ make check
[...]
Running tests using /usr/bin/python3.8 (3.8)...
Using gpg module from '/home/ingo/dev/g10/build/gpgme/lang/python/python3.8-gpg/lib.linux-x86_64-3.8/gpg'.
starting gpg-agent..
gpg-connect-agent: no running gpg-agent - starting '/opt/gnupg/master/bin/gpg-agent|--debug-quick-random'
gpg-connect-agent: waiting for the agent to come up ... (5s)
gpg-connect-agent: connection to the agent established
OK
PASS: initial.py
PASS: t-wrapper.py
PASS: t-callbacks.py
PASS: t-data.py
PASS: t-encrypt.py
PASS: t-encrypt-sym.py
PASS: t-encrypt-sign.py
PASS: t-sign.py
PASS: t-signers.py
PASS: t-decrypt.py
PASS: t-verify.py
PASS: t-decrypt-verify.py
PASS: t-sig-notation.py
PASS: t-export.py
PASS: t-import.py
PASS: t-edit.py
PASS: t-keylist.py
PASS: t-keylist-from-data.py
PASS: t-wait.py
PASS: t-encrypt-large.py
PASS: t-file-name.py
Traceback (most recent call last):
  File "/home/ingo/dev/g10/src/gpgme/lang/python/tests/t-idiomatic.py", line 86, in <module>
    sign_and_verify(b"Hallo Leute\n", signed, sink)
  File "/home/ingo/dev/g10/src/gpgme/lang/python/tests/t-idiomatic.py", line 46, in sign_and_verify
    c.op_verify(signed, None, sink)
  File "/home/ingo/dev/g10/build/gpgme/lang/python/python3.8-gpg/lib.linux-x86_64-3.8/gpg/core.py", line 141, in _funcwrap
    return errorcheck(result, name)
  File "/home/ingo/dev/g10/build/gpgme/lang/python/python3.8-gpg/lib.linux-x86_64-3.8/gpg/errors.py", line 129, in errorcheck
    raise GPGMEError(retval, extradata)
gpg.errors.GPGMEError: gpgme_op_verify: GPGME: No data
FAIL: t-idiomatic.py
PASS: t-protocol-assuan.py
PASS: t-quick-key-creation.py
PASS: t-quick-subkey-creation.py
PASS: t-quick-key-manipulation.py
PASS: t-quick-key-signing.py
stopping gpg-agent 
PASS: final.py
56 tests run, 55 succeeded, 1 failed, 0 skipped.