@Test
public void testCombineArraysWithOneItemInFirst() {
String[] first = new String[] {"a"};
String[] result = StringUtil.combineArrays(first, new String[] {});
assertEquals(1, result.length);
assertEquals("a", result[0]);
}
@Test
public void testCombineArraysWithOneItemInEach() {
String[] first = new String[] {"a"};
String[] second = new String[] {"b"};
String[] result = StringUtil.combineArrays(first, second);
assertEquals(2, result.length);
assertEquals("a", result[0]);
assertEquals("b", result[1]);
}
@Test
public void testCombineArraysWithMixedNumbers() {
String[] first = new String[] {"a", "b", "c"};
String[] second = new String[] {"d", "e"};
String[] third = new String[] {"f", "g", "h"};
String[] result = StringUtil.combineArrays(first, second, third);
assertEquals(8, result.length);
assertEquals("a", result[0]);
assertEquals("b", result[1]);
assertEquals("c", result[2]);
assertEquals("d", result[3]);
assertEquals("e", result[4]);
assertEquals("f", result[5]);
assertEquals("g", result[6]);
assertEquals("h", result[7]);
}
@Test
public void testCombineArraysBothEmpty() {
assertEquals(0, StringUtil.combineArrays(new String[] {}, new String[] {}).length);
}