@Override
    public String toString() {
        if (this.gssContext == null || !this.gssContext.isEstablished()) {
            return String.format("KERB5[src=%s,targ=%s]", this.clientName, this.serviceName);
        }
        try {
            return String.format("KERB5[src=%s,targ=%s,mech=%s]", this.gssContext.getSrcName(), this.gssContext.getTargName(),
                    this.gssContext.getMech());
        } catch (GSSException e) {

    void toString_notEstablished() throws Exception {
        when(gssContext.isEstablished()).thenReturn(false);
        String s = ctx.toString();
        assertTrue(s.startsWith("KERB5["));
        assertTrue(s.contains("src=null"));
    }

    @Test
    @DisplayName("toString shows names and mech when established")
    void toString_established_ok() throws Exception {