AlphabeticalTest.java

package com.thealgorithms.strings;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

public class AlphabeticalTest {

    @ParameterizedTest(name = "\"{0}\" → Expected: {1}")
    @CsvSource({
            "'abcdefghijklmno', true",
            "'abcdxxxyzzzz', true",
            "'123a', false",
            "'abcABC', false",
            "'abcdefghikjlmno', false",
            "'aBC', true",
            "'abc', true",
            "'xyzabc', false",
            "'abcxyz', true",
            "'', false",
            "'1', false",
            "'abc!', false",   // <-- missing coverage
            "'ABc1', false"    // <-- optional extra
    })
    void testIsAlphabetical(String input, boolean expected) {
        assertEquals(expected, Alphabetical.isAlphabetical(input));
    }

}