Tests fail with Bottle 0.12.17 and later

[rbalint]

What did you try to do?

Run tests with latest Bottle

What happened?

Some tests failed:

======================================================================
FAIL: test_getinfo_content_type_invalid_utf8_python3 (tests.getinfo_test.GetinfoTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest-lxc.m1bh5rn3/downtmp/build.VJw/src/tests/util.py", line 91, in decorated
    return fn(*args, **kwargs)
  File "/tmp/autopkgtest-lxc.m1bh5rn3/downtmp/build.VJw/src/tests/getinfo_test.py", line 117, in test_getinfo_content_type_invalid_utf8_python3
    self.fail('Should have raised')
AssertionError: Should have raised

======================================================================
FAIL: test_getinfo_cookie_invalid_utf8_python3 (tests.getinfo_test.GetinfoTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest-lxc.m1bh5rn3/downtmp/build.VJw/src/tests/util.py", line 91, in decorated
    return fn(*args, **kwargs)
  File "/tmp/autopkgtest-lxc.m1bh5rn3/downtmp/build.VJw/src/tests/getinfo_test.py", line 88, in test_getinfo_cookie_invalid_utf8_python3
    self.fail('Should have raised')
AssertionError: Should have raised

======================================================================
FAIL: test_getinfo_raw_content_type_invalid_utf8 (tests.getinfo_test.GetinfoTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest-lxc.m1bh5rn3/downtmp/build.VJw/src/tests/getinfo_test.py", line 124, in test_getinfo_raw_content_type_invalid_utf8
    self.assertEqual(expected, self.curl.getinfo_raw(pycurl.CONTENT_TYPE))
AssertionError: b'\xb3\xd2\xda\xcd\xd7' != b'\xc2\xb3\xc3\x92\xc3\x9a\xc3\x8d\xc3\x97'

======================================================================
FAIL: test_getinfo_raw_cookie_invalid_utf8 (tests.getinfo_test.GetinfoTest)

This is due to Bottle escaping invalid UTF-8 the test tries to send, since Bottle 0.12.17 fixing
bottlepy/bottle#1148

What did you expect to happen?

The tests should have passed, like before.

What is the PycURL version?

7.43.0.6

What is your Python version?

Python 3.9.1

What is your operating system and its version?

Ubuntu 21.04

Other versions

Bottle 0.12.19

Is this the most recent PycURL release?

Yes

Did you check libcurl behavior?

No