@Test
    public void testConfigureKeyRotation() {
        // Test that configuration doesn't throw
        keyManager.configureKeyRotation(60000);

        // Test disabling rotation
        keyManager.configureKeyRotation(0);

        // Test reconfiguring
        keyManager.configureKeyRotation(30000);
    }

    @Test
    public void testConcurrentKeyOperations() throws InterruptedException {

    /**
     * Configure key rotation interval
     *
     * @param intervalMillis rotation interval in milliseconds
     */
    public void configureKeyRotation(long intervalMillis) {
        this.keyRotationIntervalMillis = intervalMillis;

        // Cancel existing rotation task if any
        if (rotationTask != null) {
            rotationTask.cancel(false);