def do_qa_patch(d):
    import subprocess

    ###########################################################################
    # Check patch.log for fuzz warnings
    #
    # Further information on why we check for patch fuzz warnings:
    # http://lists.openembedded.org/pipermail/openembedded-core/2018-March/148675.html
    # https://bugzilla.yoctoproject.org/show_bug.cgi?id=10450
    ###########################################################################

    logdir = d.getVar('T')
    patchlog = os.path.join(logdir,"log.do_patch")

    if os.path.exists(patchlog):
        fuzzheader = '--- Patch fuzz start ---'
        fuzzfooter = '--- Patch fuzz end ---'
        statement = "grep -e '%s' %s > /dev/null" % (fuzzheader, patchlog)
        if subprocess.call(statement, shell=True) == 0:
            msg = "Fuzz detected:\n\n"
            fuzzmsg = ""
            inFuzzInfo = False
            f = open(patchlog, "r")
            for line in f:
                if fuzzheader in line:
                    inFuzzInfo = True
                    fuzzmsg = ""
                elif fuzzfooter in line:
                    fuzzmsg = fuzzmsg.replace('\n\n', '\n')
                    msg += fuzzmsg
                    msg += "\n"
                    inFuzzInfo = False
                elif inFuzzInfo and not 'Now at patch' in line:
                    fuzzmsg += line
            f.close()
            msg += "The context lines in the patches can be updated with devtool:\n"
            msg += "\n"
            msg += "    devtool modify %s\n" % d.getVar('PN')
            msg += "    devtool finish --force-patch-refresh %s <layer_path>\n\n" % d.getVar('PN')
            msg += "Don't forget to review changes done by devtool!\n"
            msg += "\nPatch log indicates that patches do not apply cleanly."
            oe.qa.handle_error("patch-fuzz", msg, d)

    # Check if the patch contains a correctly formatted and spelled Upstream-Status
    import re
    from oe import patch

    for url in patch.src_patches(d):
        (_, _, fullpath, _, _, _) = bb.fetch.decodeurl(url)

        msg = oe.qa.check_upstream_status(fullpath)
        if msg:
            oe.qa.handle_error("patch-status", msg, d)

    ###########################################################################
    # Check for missing ptests
    ###########################################################################
    def match_line_in_files(toplevel, filename_glob, line_regex):
        import pathlib
        try:
            toppath = pathlib.Path(toplevel)
            for entry in toppath.glob(filename_glob):
                try:
                    with open(entry, 'r', encoding='utf-8', errors='ignore') as f:
                        for line in f.readlines():
                            if re.match(line_regex, line):
                                return True
                except FileNotFoundError:
                    # Broken symlink in source
                    pass
        except FileNotFoundError:
            # pathlib.Path.glob() might throw this when file/directory
            # disappear while scanning.
            bb.note("unimplemented-ptest: FileNotFoundError exception while scanning (disappearing file while scanning?). Check was ignored." % d.getVar('PN'))
            pass
        return False

    srcdir = d.getVar('S')
    if not bb.utils.contains('DISTRO_FEATURES', 'ptest', True, False, d):
        pass
    elif not (bb.utils.contains('ERROR_QA', 'unimplemented-ptest', True, False, d) or bb.utils.contains('WARN_QA', 'unimplemented-ptest', True, False, d)):
        pass
    elif bb.data.inherits_class('ptest', d):
        bb.note("Package %s QA: skipping unimplemented-ptest: ptest implementation detected" % d.getVar('PN'))

    # Detect perl Test:: based tests
    elif os.path.exists(os.path.join(srcdir, "t")) and any(filename.endswith('.t') for filename in os.listdir(os.path.join(srcdir, 't'))):
        oe.qa.handle_error("unimplemented-ptest", "%s: perl Test:: based tests detected" % d.getVar('PN'), d)

    # Detect pytest-based tests
    elif match_line_in_files(srcdir, "**/*.py", r'\s*(?:import\s*pytest|from\s*pytest)'):
        oe.qa.handle_error("unimplemented-ptest", "%s: pytest-based tests detected" % d.getVar('PN'), d)

    # Detect meson-based tests
    elif os.path.exists(os.path.join(srcdir, "meson.build")) and match_line_in_files(srcdir, "**/meson.build", r'\s*test\s*\('):
        oe.qa.handle_error("unimplemented-ptest", "%s: meson-based tests detected" % d.getVar('PN'), d)

    # Detect cmake-based tests
    elif os.path.exists(os.path.join(srcdir, "CMakeLists.txt")) and match_line_in_files(srcdir, "**/CMakeLists.txt", r'\s*(?:add_test|enable_testing)\s*\('):
        oe.qa.handle_error("unimplemented-ptest", "%s: cmake-based tests detected" % d.getVar('PN'), d)

    # Detect autotools-based·tests
    elif os.path.exists(os.path.join(srcdir, "Makefile.in")) and (match_line_in_files(srcdir, "**/Makefile.in", r'\s*TESTS\s*\+?=') or match_line_in_files(srcdir,"**/*.at",r'.*AT_INIT')):
        oe.qa.handle_error("unimplemented-ptest", "%s: autotools-based tests detected" % d.getVar('PN'), d)

    # Last resort, detect a test directory in sources
    elif os.path.exists(srcdir) and any(filename.lower() in ["test", "tests"] for filename in os.listdir(srcdir)):
        oe.qa.handle_error("unimplemented-ptest", "%s: test subdirectory detected" % d.getVar('PN'), d)

    oe.qa.exit_if_errors(d)

do_qa_patch(d)