}
    }

    Key searchSessionKey(Subject subject) throws GSSException {
        MIEName src = new MIEName(this.gssContext.getSrcName().export());
        MIEName targ = new MIEName(this.gssContext.getTargName().export());

        ASN1ObjectIdentifier mech = ASN1ObjectIdentifier.getInstance(this.gssContext.getMech().getDER());
        for (KerberosTicket ticket : subject.getPrivateCredentials(KerberosTicket.class)) {

        when(targ.export()).thenReturn(buildExportName(new Oid("1.2.3"), "service"));
        when(gssContext.getSrcName()).thenReturn(src);
        when(gssContext.getTargName()).thenReturn(targ);
        when(gssContext.getMech()).thenReturn(new Oid("1.2.3"));

        assertNull(ctx.searchSessionKey(new javax.security.auth.Subject()));
    }

    @Test