}

    @Test
    @DisplayName("isPreferredMech delegates to underlying mechanism context")
    void testIsPreferredMechDelegates() {
        SpnegoContext ctx = newContext();
        ASN1ObjectIdentifier mech = new ASN1ObjectIdentifier("1.2.840.113554.1.2.2");
        when(this.mechContext.isPreferredMech(mech)).thenReturn(true);
        assertTrue(ctx.isPreferredMech(mech));

    /**
     * Checks whether the specified mechanism is the preferred mechanism.
     * @param selectedMech the selected mechanism OID
     * @return whether the specified mechanism is preferred
     */
    boolean isPreferredMech(ASN1ObjectIdentifier selectedMech);

    /**
     * Gets the negotiated context flags.
     * @return context flags
     */
    int getFlags();

    /**