public void put(final String clientId, final PushConnection pushConnection) {
        pushConnection.setSecureToken(mintNewSecureToken());
        clientPushConnectionMap.put(clientId, pushConnection);
    }
@Test
    void testPutAssignsTokenToConnection() {
        pushConnectionRegistry.put("clientId1", pushConnection);

        verify(pushConnection).setSecureToken(anyString());
    }