RemoveDuplicateFromStringTest.java

packagecom.thealgorithms.others;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertNull;

importorg.junit.jupiter.api.Test;

classRemoveDuplicateFromStringTest {

@Test
voidtestEmptyString() {
assertEquals("", RemoveDuplicateFromString.removeDuplicate(""));
 }

@Test
voidtestNullString() {
assertNull(RemoveDuplicateFromString.removeDuplicate(null));
 }

@Test
voidtestSingleCharacterString() {
assertEquals("a", RemoveDuplicateFromString.removeDuplicate("a"));
 }

@Test
voidtestStringWithNoDuplicates() {
assertEquals("abc", RemoveDuplicateFromString.removeDuplicate("abc"));
 }

@Test
voidtestStringWithDuplicates() {
assertEquals("abcd", RemoveDuplicateFromString.removeDuplicate("aabbbccccddddd"));
 }

@Test
voidtestStringWithAllSameCharacters() {
assertEquals("a", RemoveDuplicateFromString.removeDuplicate("aaaaa"));
 }

@Test
voidtestStringWithMixedCase() {
assertEquals("abAB", RemoveDuplicateFromString.removeDuplicate("aabABAB"));
 }
}