How to test function behaviour in single test method?

I have a testing environment like this

class KeyGenTests(TestCase):
    """
    Tests for various functions used to implement the I{ckeygen} script.
    """
    def setUp(self):
        """
        Patch C{sys.stdout} with a L{StringIO} instance to tests can make
        assertions about what's printed.
        """
        self.stdout = StringIO()
        self.patch(sys, 'stdout', self.stdout)


    def test_printFingerprint(self):
        """
        L{printFingerprint} writes a line to standard out giving the number of
        bits of the key, its fingerprint, and the basename of the file from it
        was read.
        """
        filename = self.mktemp()
        FilePath(filename).setContent(publicRSA_openssh)
        printFingerprint({'filename': filename})
        self.assertEqual(
            self.stdout.getvalue(),
            '768 3d:13:5f:cb:c9:79:8a:93:06:27:65:bc:3d:0b:8f:af temp\n')

and the corresponding function is

def printFingerprint(options):
    if not options['filename']:
        filename = os.path.expanduser('~/.ssh/id_rsa')
        options['filename'] = raw_input('Enter file in which the key is (%s): ' % filename)
    if os.path.exists(options['filename']+'.pub'):
        options['filename'] += '.pub'
    try:
        key = keys.Key.fromFile(options['filename'])
        print('%s %s %s' % (
            key.size(),
            key.fingerprint(),
            os.path.basename(options['filename'])))
    except:
        sys.exit('bad key')

now I am adding support for key fingerprint generation with different formats, something like

 def printFingerprint(options, fingerPrintformat='md5-hex'):
        """
        Writes a line to standard out giving the number of bits of the key,
        its fingerprint, and the basename of the file from it was read.
        """
        if not options['filename']:
            filename = os.path.expanduser('~/.ssh/id_rsa')
            options['filename'] = raw_input('Enter file in which the key is (%s): ' % filename)
        if os.path.exists(options['filename']+'.pub'):
            options['filename'] += '.pub'
        try:
            key = keys.Key.fromFile(options['filename'])
            print('%s %s %s' % (
                key.size(),
                key.fingerprint(fingerPrintformat),
                os.path.basename(options['filename'])))
        except:
            sys.exit('bad key')

The fingerprint function works properly.

My question is how do I modify the test method to cover all the algorithms for fingerprint generation in a single test method. As the test uses temp files for reading and writing the key fingerprints. Writing a different test method for each hash function is repetitive coding and doesn't match the coding standards of the project.