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Merged
merged 3 commits into from
Sep 18, 2025
Merged

ledger, linked-list, list-ops #3016

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3ea0d41
ledger, linked-list, list-ops
AtharvOps Sep 15, 2025
e593942
Update LedgerTest.java
AtharvOps Sep 15, 2025
f0f4247
Merge branch 'main' into display13
jagdish-15 Sep 18, 2025
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16 changes: 14 additions & 2 deletions exercises/practice/ledger/src/test/java/LedgerTest.java
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;

Expand All @@ -23,6 +24,7 @@ public void setUp() throws Exception {

@Disabled("Remove to run test")
@Test
@DisplayName("empty ledger")
public void emptyLedgerUS() {
var entries = new Ledger.LedgerEntry[] {};

Expand All @@ -34,6 +36,7 @@ public void emptyLedgerUS() {

@Disabled("Remove to run test")
@Test
@DisplayName("one entry")
public void oneEntry() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-01", "Buy present", -1000)
Expand All @@ -48,6 +51,7 @@ public void oneEntry() {

@Disabled("Remove to run test")
@Test
@DisplayName("credit and debit")
public void creditAndDebit() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-02", "Get present", 1000),
Expand All @@ -65,6 +69,7 @@ public void creditAndDebit() {

@Disabled("Remove to run test")
@Test
@DisplayName("multiple entries on same date ordered by description")
public void multipleEntriesOnSameDateOrderedByDescription() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-01", "Get present", 1000),
Expand All @@ -82,6 +87,7 @@ public void multipleEntriesOnSameDateOrderedByDescription() {

@Disabled("Remove to run test")
@Test
@DisplayName("final order tie breaker is change")
public void finalOrderTieBreakerIsChange() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-01", "Something", 0),
Expand All @@ -101,6 +107,7 @@ public void finalOrderTieBreakerIsChange() {

@Disabled("Remove to run test")
@Test
@DisplayName("overlong description is truncated")
public void overlongDescriptions() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-01", "Freude schoner Gotterfunken", -123456)
Expand All @@ -116,6 +123,7 @@ public void overlongDescriptions() {

@Disabled("Remove to run test")
@Test
@DisplayName("euros")
public void euros() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-01-01", "Buy present", -1000)
Expand All @@ -131,6 +139,7 @@ public void euros() {

@Disabled("Remove to run test")
@Test
@DisplayName("Dutch locale")
public void dutchLocale() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-03-12", "Buy present", 123456)
Expand All @@ -146,6 +155,7 @@ public void dutchLocale() {

@Disabled("Remove to run test")
@Test
@DisplayName("Dutch locale and euros")
public void dutchLocaleAndEuros() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-03-12", "Buy present", 123456)
Expand All @@ -161,6 +171,7 @@ public void dutchLocaleAndEuros() {

@Disabled("Remove to run test")
@Test
@DisplayName("Dutch negative number with 3 digits before decimal point")
public void dutchNegativeNumberWith3DigitsBeforeDecimalPoint() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-03-12", "Buy present", -12345)
Expand All @@ -176,6 +187,7 @@ public void dutchNegativeNumberWith3DigitsBeforeDecimalPoint() {

@Disabled("Remove to run test")
@Test
@DisplayName("American negative number with 3 digits before decimal point")
public void americanNegativeNumberWith3DigitsBeforeDecimalPoint() {
var entries = new Ledger.LedgerEntry[] {
ledger.createLedgerEntry("2015-03-12", "Buy present", -12345)
Expand Down
9 changes: 9 additions & 0 deletions exercises/practice/linked-list/src/test/java/DoublyLinkedListTest.java
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Original file line number Diff line number Diff line change
@@ -1,11 +1,13 @@
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;

public class DoublyLinkedListTest {

@Test
@DisplayName("pop gets element from the list")
public void popGetsElementFromTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -16,6 +18,7 @@ public void popGetsElementFromTheList() {

@Disabled("Remove to run test")
@Test
@DisplayName("push/pop respectively add/remove at the end of the list")
public void pushAndPopRespectivelyAddsAndRemovesAtEndOfList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -28,6 +31,7 @@ public void pushAndPopRespectivelyAddsAndRemovesAtEndOfList() {

@Disabled("Remove to run test")
@Test
@DisplayName("shift gets an element from the list")
public void shiftGetsAnElementFromTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -38,6 +42,7 @@ public void shiftGetsAnElementFromTheList() {

@Disabled("Remove to run test")
@Test
@DisplayName("shift gets first element from the list")
public void shiftGetsFirstElementFromTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -50,6 +55,7 @@ public void shiftGetsFirstElementFromTheList() {

@Disabled("Remove to run test")
@Test
@DisplayName("unshift adds element at start of the list")
public void unshiftAddsElementAtStartOfTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -62,6 +68,7 @@ public void unshiftAddsElementAtStartOfTheList() {

@Disabled("Remove to run test")
@Test
@DisplayName("pop push shift unshift can be used in any order")
public void popPushShiftUnshiftCanBeUsedInAnyOrder() {
DoublyLinkedList<String> list = new DoublyLinkedList<>();

Expand All @@ -84,6 +91,7 @@ public void popPushShiftUnshiftCanBeUsedInAnyOrder() {

@Disabled("Remove to run test")
@Test
@DisplayName("popping to empty doesn't break the list")
public void poppingToEmptyDoesNotBreakTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand All @@ -98,6 +106,7 @@ public void poppingToEmptyDoesNotBreakTheList() {

@Disabled("Remove to run test")
@Test
@DisplayName("shifting to empty doesn't break the list")
public void shiftingToEmptyDoesNotBreakTheList() {
DoublyLinkedList<Integer> list = new DoublyLinkedList<>();

Expand Down
23 changes: 23 additions & 0 deletions exercises/practice/list-ops/src/test/java/ListOpsTest.java
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import java.util.List;
Expand All @@ -8,39 +9,45 @@
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<List<Character>> listOfLists = List.of(
List.of('1', '2'),
Expand All @@ -54,6 +61,7 @@ public void testConcatListOfLists() {

@Disabled("Remove to run test")
@Test
@DisplayName("list of nested lists")
public void testConcatListOfNestedLists() {
List<List<List<Character>>> listOfNestedLists = List.of(
List.of(
Expand Down Expand Up @@ -82,45 +90,52 @@ public void testConcatListOfNestedLists() {

@Disabled("Remove to run test")
@Test
@DisplayName("empty list")
public void testFilteringEmptyList() {
assertThat(ListOps.filter(List.<Integer>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.<Integer>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(
Expand All @@ -132,6 +147,7 @@ public void testFoldLeftEmptyList() {

@Disabled("Remove to run test")
@Test
@DisplayName("direction independent function applied to non-empty list")
public void testFoldLeftDirectionIndependentFunctionAppliedToNonEmptyList() {
assertThat(
ListOps.foldLeft(
Expand All @@ -143,6 +159,7 @@ public void testFoldLeftDirectionIndependentFunctionAppliedToNonEmptyList() {

@Disabled("Remove to run test")
@Test
@DisplayName("direction dependent function applied to non-empty list")
public void testFoldLeftDirectionDependentFunctionAppliedToNonEmptyList() {
assertThat(
ListOps.foldLeft(
Expand All @@ -154,6 +171,7 @@ public void testFoldLeftDirectionDependentFunctionAppliedToNonEmptyList() {

@Disabled("Remove to run test")
@Test
@DisplayName("empty list")
public void testFoldRightEmptyList() {
assertThat(
ListOps.foldRight(
Expand All @@ -165,6 +183,7 @@ public void testFoldRightEmptyList() {

@Disabled("Remove to run test")
@Test
@DisplayName("direction independent function applied to non-empty list")
public void testFoldRightDirectionIndependentFunctionAppliedToNonEmptyList() {
assertThat(
ListOps.foldRight(
Expand All @@ -176,6 +195,7 @@ public void testFoldRightDirectionIndependentFunctionAppliedToNonEmptyList() {

@Disabled("Remove to run test")
@Test
@DisplayName("direction dependent function applied to non-empty list")
public void testFoldRightDirectionDependentFunctionAppliedToNonEmptyList() {
assertThat(
ListOps.foldRight(
Expand All @@ -187,19 +207,22 @@ public void testFoldRightDirectionDependentFunctionAppliedToNonEmptyList() {

@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<List<Character>> listOfLists = List.of(
List.of('1', '2'),
Expand Down