assertEquals("IO error", e.getCause().getMessage());
        } catch (Exception e) {
            fail("Should have caught DataStoreException specifically");
        }
    }

    public void test_multipleExceptionTypes() {
        // Test with different types of causes
        DataStoreException withIOException = new DataStoreException("IO Error", new java.io.IOException("File not found"));

        assertNotNull(exception);
        assertEquals(longMessage, exception.getMessage());
        assertEquals(messageCode, exception.getMessageCode());
    }

    public void test_multipleExceptionTypes() {
        // Setup - test with different types of causes
        final String message = "Query processing error";