} catch (final LlmException e) {
            caught = true;
            assertEquals("Test exception", e.getMessage());
        }
        assertTrue(caught);
    }

    @Test
    public void test_catchAsFessSystemException() {
        boolean caught = false;
        try {
            throw new LlmException("Test exception");
        } catch (final FessSystemException e) {
            caught = true;

        } catch (Exception e) {
            fail("Should have caught ThemeException, but caught: " + e.getClass());
        }
    }

    @Test
    public void test_catchAsFessSystemException() {
        // Test catching as parent exception type
        String message = "Theme error";

        try {
            throw new ThemeException(message);
        } catch (FessSystemException e) {

            assertNull(e.getCause());
        } catch (Exception e) {
            fail("Should have caught ContentNotFoundException");
        }
    }

    @Test
    public void test_catchAsFessSystemException() {
        // Test catching as parent exception type
        String parentUrl = "http://example.com/parent";
        String url = "http://example.com/child";

        try {

            assertEquals(expectedCause, e.getCause());
        } catch (Exception e) {
            fail("Should have caught SearchQueryException");
        }
    }

    @Test
    public void test_catchAsFessSystemException() {
        // Test catching as parent exception type
        String message = "Polymorphism test";

        try {
            throw new SearchQueryException(message);