Unit Testing Stateless Authentication Filter

Camunda 7 Topics Discussion & Questions
1

I am referring to this guide for Stateless authentication and trying to write unit test case for the same

@Test
    public void testIdentityService() throws IOException, ServletException {
        // Given
        HttpServletRequest request = mock(HttpServletRequest.class);
        HttpServletResponse response = mock(HttpServletResponse.class);
        FilterChain filterChain = mock(FilterChain.class);

        processEngine = EngineUtil.lookupProcessEngine("default");
        // When

        when(securityContext.getAuthentication()).thenReturn(authentication);
        when(securityContext.getAuthentication().getPrincipal()).thenReturn("random");

        SecurityContextHolder.setContext(securityContext);

        filter.doFilter(request, response, filterChain);
    }

I am getting an exception for

private void clearAuthentication(ProcessEngine engine) {
        engine.getIdentityService().clearAuthentication();
    }

Debugginf the test tells me that engine is null. Is there a way to mock ProcessEngine engine = EngineUtil.lookupProcessEngine("default"); in my unit test?

Any help appreciated.