Upgrading pytest 5 to 6

PytestDeprecationWarning warnings are now errors by default; affected features will be removed in pytest 6.1.

Removes the exec_() and is_true() methods of _pytest._code.Frame.

Expressions given to -m and -k are no longer evaluated using Python's eval; only or, and, not, parentheses and identifiers are supported.

Removes the item.catch_log_handler and item.catch_log_handlers attributes and the deprecated --no-print-logs option.

Removes the unused args parameter from pytest.Function.__init__.

Removes the pytest_doctest_prepare_content hook specification, which has not been triggered for at least 10 years.

pytest now supports Python 3.6 and newer only.

Removes features deprecated in the 5.X series: funcargnames, positional fixture args, direct Node construction, junit_family default, TerminalReporter.writer, and --result-log.

Symlinks are no longer resolved during collection and matching conftest.py files with test file paths.

Testdir.run().parseoutcomes() now always returns parsed nouns in plural form.

The os.dup() function is now assumed to exist.

-k no longer matches directory names outside the test session root, and pytest.Package.name is now just the package directory name.

Pytest uses its own TerminalWriter class instead of the py library one, with several breaking changes to its API and behavior.

Removes several internal _pytest._code.source APIs, including Source arguments, comparison with str, and compile/getsource helpers.

Exits with an error if --basetemp is empty, the current working directory, or a parent directory.

TestReport.longrepr is now always a ReprExceptionInfo instance, previously a str when a test failed with pytest.fail(..., pytrace=False).

Creates temporary directories under /tmp with private permissions and errors if a pre-existing pytest-of-<username> directory is owned by another user.

Adds support for Python 3.10.

Directly constructing or calling several private classes and functions is deprecated and now emits a warning.

The --strict command-line option is deprecated in favor of --strict-markers.

The @pytest.yield_fixture decorator is deprecated; use pytest.fixture instead.

Deprecates the pytest.collect module; all its names can be imported from pytest directly.

Deprecates the pytest._fillfuncargs function kept for backward compatibility with an older plugin.

Deprecates the special -k '-expr' and -k 'expr:' syntaxes; use -k 'not expr' instead.

Deprecates the pytest_warning_captured hook in favor of pytest_warning_recorded, to be removed in a future version.

Deprecates gethookproxy() and isinitpath() methods of FSCollector and Package; use self.session equivalents instead.

Deprecates the special -k '-expr' syntax in favor of -k 'not expr', and the special -k 'expr:' syntax.

Deprecates the pytest_warning_captured hook in favor of the pytest_warning_recorded hook.