How to use the incremental.getVersionString function in incremental

def test_getVersionStringWithPrerelease(self):
        """
        L{getVersionString} includes the prerelease, if any.
        """
        self.assertEqual(
            getVersionString(Version("whatever", 8, 0, 0, prerelease=1)),
            "whatever 8.0.0pre1")

def test_getVersionStringWithRevision(self):
        """
        L{getVersionString} includes the discovered revision number.
        """
        self.svnEntries.child(b"format").setContent(b"9\n")
        self.svnEntries.child(b"entries").setContent(VERSION_10_ENTRIES)
        version = getVersionString(self.getVersion())
        self.assertEqual(
            "twisted_python_versions_package 1.0.0+r22715",
            version)
        self.assertTrue(isinstance(version, type("")))

given.
    @type format: C{str}

    @param replacement: what should be used in place of C{fqpn}. Either pass in
        a string, which will be inserted into the warning message, or a
        callable, which will be expanded to its full import path.
    @type replacement: C{str} or callable

    @return: A textual description of the deprecation
    @rtype: C{str}
    """
    if format is None:
        format = DEPRECATION_WARNING_FORMAT
    warningString = format % {
        'fqpn': fqpn,
        'version': getVersionString(version)}
    if replacement:
        warningString = "%s; %s" % (
            warningString, _getReplacementString(replacement))
    return warningString

given.
    @type format: C{str}

    @param replacement: what should be used in place of C{fqpn}. Either pass in
        a string, which will be inserted into the warning message, or a
        callable, which will be expanded to its full import path.
    @type replacement: C{str} or callable

    @return: A textual description of the deprecation
    @rtype: C{str}
    """
    if format is None:
        format = DEPRECATION_WARNING_FORMAT
    warningString = format % {
        'fqpn': fqpn,
        'version': getVersionString(version)}
    if replacement:
        warningString = "%s; %s" % (
            warningString, _getReplacementString(replacement))
    return warningString

def _getDeprecationDocstring(version, replacement=None):
    """
    Generate an addition to a deprecated object's docstring that explains its
    deprecation.

    @param version: the version it was deprecated.
    @type version: L{incremental.Version}

    @param replacement: The replacement, if specified.
    @type replacement: C{str} or callable

    @return: a string like "Deprecated in Twisted 27.2.0; please use
        twisted.timestream.tachyon.flux instead."
    """
    doc = "Deprecated in %s" % (getVersionString(version),)
    if replacement:
        doc = "%s; %s" % (doc, _getReplacementString(replacement))
    return doc + "."

def _getDeprecationDocstring(version, replacement=None):
    """
    Generate an addition to a deprecated object's docstring that explains its
    deprecation.

    @param version: the version it was deprecated.
    @type version: L{incremental.Version}

    @param replacement: The replacement, if specified.
    @type replacement: C{str} or callable

    @return: a string like "Deprecated in Twisted 27.2.0; please use
        twisted.timestream.tachyon.flux instead."
    """
    doc = "Deprecated in %s" % (getVersionString(version),)
    if replacement:
        doc = "%s; %s" % (doc, _getReplacementString(replacement))
    return doc + "."