import org.junit.jupiter.api.Disabled; import org.junit.jupiter.api.DisplayName; import org.junit.jupiter.api.Test; import java.util.NoSuchElementException; import static org.assertj.core.api.Assertions.assertThat; import static org.assertj.core.api.Assertions.assertThatExceptionOfType; public class SimpleLinkedListTest { @Test @DisplayName("A new list is empty") public void aNewListIsEmpty() { SimpleLinkedList list = new SimpleLinkedList<>(); assertThat(list.size()).isEqualTo(0); } @Disabled("Remove to run test") @Test @DisplayName("Create list from array") public void canCreateFromArray() { Character[] values = new Character[]{'1', '2', '3'}; SimpleLinkedList list = new SimpleLinkedList(values); assertThat(list.size()).isEqualTo(3); } @Disabled("Remove to run test") @Test @DisplayName("Popping an empty list throws NoSuchElementException") public void popOnEmptyListWillThrow() { SimpleLinkedList list = new SimpleLinkedList(); assertThatExceptionOfType(NoSuchElementException.class).isThrownBy(list::pop); } @Disabled("Remove to run test") @Test @DisplayName("Pop returns last added element (LIFO)") public void popReturnsLastAddedElement() { SimpleLinkedList list = new SimpleLinkedList(); list.push(9); list.push(8); assertThat(list.size()).isEqualTo(2); assertThat(list.pop()).isEqualTo(8); assertThat(list.pop()).isEqualTo(9); assertThat(list.size()).isEqualTo(0); } @Disabled("Remove to run test") @Test @DisplayName("Reverse reverses the list order") public void reverseReversesList() { SimpleLinkedList list = new SimpleLinkedList(); list.push("9"); list.push("8"); list.push("7"); list.push("6"); list.push("5"); list.reverse(); assertThat(list.pop()).isEqualTo("9"); assertThat(list.pop()).isEqualTo("8"); assertThat(list.pop()).isEqualTo("7"); assertThat(list.pop()).isEqualTo("6"); assertThat(list.pop()).isEqualTo("5"); } @Disabled("Remove to run test") @Test @DisplayName("Can return list as an array") public void canReturnListAsArray() { SimpleLinkedList list = new SimpleLinkedList(); list.push('9'); list.push('8'); list.push('7'); list.push('6'); list.push('5'); Character[] expected = {'5', '6', '7', '8', '9'}; assertThat(list.asArray(Character.class)).isEqualTo(expected); } @Disabled("Remove to run test") @Test @DisplayName("Can return empty list as an empty array") public void canReturnEmptyListAsEmptyArray() { SimpleLinkedList