String[] result;

        // Leading and trailing spaces
        value = " value1 , value2 , value3 ";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(3, result.length);
        assertEquals(" value1 ", result[0]);
        assertEquals(" value2 ", result[1]);
        assertEquals(" value3 ", result[2]);

        // Spaces in quoted values
        value = "\" spaced value \",\"  another  \"";

        value = "key.with.dots=value\nkey_with_underscores=value with spaces\nkey-with-dashes=value@#$%";
        paramMap = ParameterUtil.parse(value);
        assertEquals(3, paramMap.size());
        assertEquals("value", paramMap.get("key.with.dots"));
        assertEquals("value with spaces", paramMap.get("key_with_underscores"));
        assertEquals("value@#$%", paramMap.get("key-with-dashes"));
    }

    }

    @Test
    public void test_specialCharacters() throws Exception {
        // Test with special characters
        String content = "test1\n" + "日本語\n" + "word with spaces\n" + "\ttab\tword\t\n";

        // Write content to test file
        writeTestFile(content);

        // Reload the file
        protwordsFile.reload(null);

        assertEquals("test_suffix", execJob.logSuffix);
        assertSame(execJob, result);

        // Test with leading/trailing spaces
        result = execJob.logSuffix("  another suffix  ");
        assertEquals("another_suffix", execJob.logSuffix);

        // Test with multiple spaces
        result = execJob.logSuffix("multi  space  suffix");
        assertEquals("multi__space__suffix", execJob.logSuffix);
    }

        // Test with null groups
        user = new TestFessUser("testuser", new String[] {}, null, new String[] {});
        assertNull(user.getGroupNames());

        // Test with groups containing spaces
        groups = new String[] { "group one", "group two" };
        user = new TestFessUser("testuser", new String[] {}, groups, new String[] {});
        assertArrayEquals(groups, user.getGroupNames());
    }

    @Test

    public void test_add_whitespaceInName() {
        TestScriptEngine engine = new TestScriptEngine();
        scriptEngineFactory.add("  test  ", engine);

        // Should be stored with lowercase and original spaces
        ScriptEngine retrieved = scriptEngineFactory.getScriptEngine("  test  ");
        assertNotNull(retrieved);
        assertEquals(engine, retrieved);
    }

            return "https://hooks.slack.com/services/test";
        }

        @Override
        public String getGoogleChatWebhookUrls() {
            return "https://chat.googleapis.com/v1/spaces/test/messages?key=test";
        }
    }

    private static class MockSMailPostingDiscloser implements SMailPostingDiscloser {
        private String subject;
        private String plainText;

    @Test
    public void test_special_characters_in_paths() throws Exception {
        final File tempDir = new File(System.getProperty("java.io.tmpdir"));
        final File outputFile = new File(tempDir, "test file with spaces.out");

        try {
            generator.setCommandList(Collections.singletonList("echo test"));
            generator.generate("test_id", outputFile);

    }

    /**
     * Joins array or list elements into a single space-separated string.
     *
     * @param input the input object (String[], List, or String)
     * @return joined string with elements separated by spaces, or empty string if invalid input
     */
    public static String join(final Object input) {
        String[] values = null;
        if (input instanceof String[]) {
            values = (String[]) input;

import org.codelibs.fess.util.QueryResponseList;
import org.dbflute.optional.OptionalThing;
import org.junit.jupiter.api.Test;

/**
 * Edge case tests for RankFusionProcessor.
 * Tests boundary conditions, empty states, and error scenarios.
 */
public class RankFusionProcessorEdgeCaseTest extends UnitFessTestCase {

    private static final String ID_FIELD = "_id";

    /**