request.setFileId(testFileId);
        }, "Should handle multiple setFileId calls");
    }

    @Test
    @DisplayName("Should test interface with anonymous implementation")
    void testAnonymousImplementation() {
        // Given
        byte[] capturedFileId = new byte[1];
        RequestWithFileId anonymousImpl = new RequestWithFileId() {
            private byte[] fileId;

            @Override