import org.junit.jupiter.api.Disabled; import org.junit.jupiter.api.DisplayName; import org.junit.jupiter.api.Test; import java.util.List; import static org.assertj.core.api.Assertions.assertThat; public class ListOpsTest { @Test @DisplayName("empty lists") public void testAppendingEmptyLists() { assertThat(ListOps.append(List.of(), List.of())).isEmpty(); } @Disabled("Remove to run test") @Test @DisplayName("list to empty list") public void testAppendingListToEmptyList() { assertThat(ListOps.append(List.of(), List.of('1', '2', '3', '4'))) .containsExactly('1', '2', '3', '4'); } @Disabled("Remove to run test") @Test @DisplayName("empty list to list") public void testAppendingEmptyListToList() { assertThat(ListOps.append(List.of('1', '2', '3', '4'), List.of())) .containsExactly('1', '2', '3', '4'); } @Disabled("Remove to run test") @Test @DisplayName("non-empty lists") public void testAppendingNonEmptyLists() { assertThat(ListOps.append(List.of("1", "2"), List.of("2", "3", "4", "5"))) .containsExactly("1", "2", "2", "3", "4", "5"); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testConcatEmptyList() { assertThat(ListOps.concat(List.of())).isEmpty(); } @Disabled("Remove to run test") @Test @DisplayName("list of lists") public void testConcatListOfLists() { List> listOfLists = List.of( List.of('1', '2'), List.of('3'), List.of(), List.of('4', '5', '6') ); assertThat(ListOps.concat(listOfLists)).containsExactly('1', '2', '3', '4', '5', '6'); } @Disabled("Remove to run test") @Test @DisplayName("list of nested lists") public void testConcatListOfNestedLists() { List>> listOfNestedLists = List.of( List.of( List.of('1'), List.of('2') ), List.of( List.of('3') ), List.of( List.of() ), List.of( List.of('4', '5', '6') ) ); assertThat(ListOps.concat(listOfNestedLists)) .containsExactly( List.of('1'), List.of('2'), List.of('3'), List.of(), List.of('4', '5', '6')); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testFilteringEmptyList() { assertThat(ListOps.filter(List.of(), integer -> integer % 2 == 1)) .isEmpty(); } @Disabled("Remove to run test") @Test @DisplayName("non-empty list") public void testFilteringNonEmptyList() { assertThat(ListOps.filter(List.of(1, 2, 3, 5), integer -> integer % 2 == 1)) .containsExactly(1, 3, 5); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testSizeOfEmptyList() { assertThat(ListOps.size(List.of())).isEqualTo(0); } @Disabled("Remove to run test") @Test @DisplayName("non-empty list") public void testSizeOfNonEmptyList() { assertThat(ListOps.size(List.of("one", "two", "three", "four"))).isEqualTo(4); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testTransformingEmptyList() { assertThat(ListOps.map(List.of(), integer -> integer + 1)).isEmpty(); } @Disabled("Remove to run test") @Test @DisplayName("non-empty list") public void testTransformingNonEmptyList() { assertThat(ListOps.map(List.of(1, 3, 5, 7), integer -> integer + 1)) .containsExactly(2, 4, 6, 8); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testFoldLeftEmptyList() { assertThat( ListOps.foldLeft( List.of(), 2.0, (acc, el) -> el * acc)) .isEqualTo(2.0); } @Disabled("Remove to run test") @Test @DisplayName("direction independent function applied to non-empty list") public void testFoldLeftDirectionIndependentFunctionAppliedToNonEmptyList() { assertThat( ListOps.foldLeft( List.of(1, 2, 3, 4), 5, (acc, el) -> el + acc)) .isEqualTo(15); } @Disabled("Remove to run test") @Test @DisplayName("direction dependent function applied to non-empty list") public void testFoldLeftDirectionDependentFunctionAppliedToNonEmptyList() { assertThat( ListOps.foldLeft( List.of(1.0, 2.0, 3.0, 4.0), 24.0, (acc, el) -> el / acc)) .isEqualTo(64.0); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testFoldRightEmptyList() { assertThat( ListOps.foldRight( List.of(), 2.0, (el, acc) -> acc * el)) .isEqualTo(2.0); } @Disabled("Remove to run test") @Test @DisplayName("direction independent function applied to non-empty list") public void testFoldRightDirectionIndependentFunctionAppliedToNonEmptyList() { assertThat( ListOps.foldRight( List.of(1, 2, 3, 4), 5, (el, acc) -> acc + el)) .isEqualTo(15); } @Disabled("Remove to run test") @Test @DisplayName("direction dependent function applied to non-empty list") public void testFoldRightDirectionDependentFunctionAppliedToNonEmptyList() { assertThat( ListOps.foldRight( List.of(1.0, 2.0, 3.0, 4.0), 24.0, (el, acc) -> el / acc)) .isEqualTo(9.0); } @Disabled("Remove to run test") @Test @DisplayName("empty list") public void testReversingEmptyList() { assertThat(ListOps.reverse(List.of())).isEmpty(); } @Disabled("Remove to run test") @Test @DisplayName("non-empty list") public void testReversingNonEmptyList() { assertThat(ListOps.reverse(List.of('1', '3', '5', '7'))) .containsExactly('7', '5', '3', '1'); } @Disabled("Remove to run test") @Test @DisplayName("list of lists is not flattened") public void testReversingListOfListIsNotFlattened() { List> listOfLists = List.of( List.of('1', '2'), List.of('3'), List.of(), List.of('4', '5', '6') ); assertThat(ListOps.reverse(listOfLists)) .containsExactly( List.of('4', '5', '6'), List.of(), List.of('3'), List.of('1', '2')); } }