def METHOD_NAME(self):
    self.assertEqual(userNameToFileName("a"), "a")
    self.assertEqual(userNameToFileName("A"), "A_")
    self.assertEqual(userNameToFileName("AE"), "A_E_")
    self.assertEqual(userNameToFileName("Ae"), "A_e")
    self.assertEqual(userNameToFileName("ae"), "ae")
    self.assertEqual(userNameToFileName("aE"), "aE_")
    self.assertEqual(userNameToFileName("a.alt"), "a.alt")
    self.assertEqual(userNameToFileName("A.alt"), "A_.alt")
    self.assertEqual(userNameToFileName("A.Alt"), "A_.A_lt")
    self.assertEqual(userNameToFileName("A.aLt"), "A_.aL_t")
    self.assertEqual(userNameToFileName("A.alT"), "A_.alT_")
    self.assertEqual(userNameToFileName("T_H"), "T__H_")
    self.assertEqual(userNameToFileName("T_h"), "T__h")
    self.assertEqual(userNameToFileName("t_h"), "t_h")
    self.assertEqual(userNameToFileName("F_F_I"), "F__F__I_")
    self.assertEqual(userNameToFileName("f_f_i"), "f_f_i")
    self.assertEqual(userNameToFileName("Aacute_V.swash"), "A_acute_V_.swash")
    self.assertEqual(userNameToFileName(".notdef"), "_notdef")
    self.assertEqual(userNameToFileName("con"), "_con")
    self.assertEqual(userNameToFileName("CON"), "C_O_N_")
    self.assertEqual(userNameToFileName("con.alt"), "_con.alt")
    self.assertEqual(userNameToFileName("alt.con"), "alt._con")