assertTrue(mockFilterChain.wasDoFilterCalled());
        assertTrue(handler.wasProcessCalled());
        assertEquals(0, mockResponse.getStatus());
    }

    // Test with OPTIONS request (preflight)
    @Test
    public void test_doFilter_withCorsHandler_options() throws IOException, ServletException {
        String origin = "http://example.com";
        mockRequest.setHeader("Origin", origin);