assertTrue("Should be called after getText", extractor.isValidateCalled());
    }

    /**
     * Test validateInputStream with edge case: empty stream.
     */
    public void test_validateInputStream_acceptsEmptyStream() {
        final InputStream emptyStream = new ByteArrayInputStream(new byte[0]);

        // Should not throw exception for empty but non-null stream
        extractor.testValidateInputStream(emptyStream);