Upgrade to JUnit 5

.github/workflows/build-version.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '8', '11', '17']
+        java: [ '8', '11', '17', '21' ]
         architecture: [ 'x64' ]
     name: Build with JDK ${{ matrix.java }} on ${{ matrix.architecture }}
     steps:

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '8', '11', '17' ]
+        java: [ '8', '11', '17', '21' ]
         architecture: [ 'x64' ]
     name: Build with JDK ${{ matrix.java }} on ${{ matrix.architecture }}
     steps:

build.gradle

@@ -43,7 +43,7 @@ plugins {
 ext.ammoniteScalaVersion = '2.13'
 ext.ammoniteVersion = '2.5.11'
 ext.assertjVersion = '3.26.3'
-ext.junitVersion = '4.13.2'
+ext.junitVersion = '5.11.0'
 
 // JAVA_VERSION used for CI build matrix, may be provided as env variable
 def javaVersion = Integer.parseInt(System.getenv('JAVA_VERSION') ?: '8')
@@ -57,10 +57,16 @@ repositories {
 // --                       --
 
 dependencies {
-    testImplementation "junit:junit:$junitVersion"
+    testImplementation "org.junit.jupiter:junit-jupiter:$junitVersion"
     testImplementation "org.assertj:assertj-core:$assertjVersion"
 }
 
+tasks.withType(Test).configureEach {
+    useJUnitPlatform()
+
+    maxHeapSize = '1G'
+}
+
 java {
     toolchain {
         languageVersion.set(JavaLanguageVersion.of(javaVersion))

generator/Generator.sc

@@ -2627,7 +2627,7 @@ def generateTestClasses(): Unit = {
     genVavrFile("io.vavr", s"APITest", baseDir = TARGET_TEST)((im: ImportManager, packageName, className) => {
 
       val assertThat = im.getStatic("org.assertj.core.api.Assertions.assertThat")
-      val test = im.getType("org.junit.Test")
+      val test = im.getType("org.junit.jupiter.api.Test")
 
       val API = im.getType("io.vavr.API")
       val AssertionsExtensions = im.getType("io.vavr.AssertionsExtensions")
@@ -2844,7 +2844,7 @@ def generateTestClasses(): Unit = {
 
       def genShortcutsTests(im: ImportManager, packageName: String, className: String): String = {
 
-        val fail = im.getStatic("org.junit.Assert.fail")
+        val fail = im.getStatic("org.junit.jupiter.api.Assertions.fail")
         val captureStdOut = im.getStatic("io.vavr.OutputTester.captureStdOut")
 
         xs"""
@@ -3090,7 +3090,8 @@ def generateTestClasses(): Unit = {
         val functionArgs = (1 to i).gen(j => s"o$j")(", ")
         val generics = (1 to i + 1).gen(j => "Object")(", ")
 
-        val test = im.getType("org.junit.Test")
+        val test = im.getType("org.junit.jupiter.api.Test")
+        val assertThrows = im.getStatic("org.junit.jupiter.api.Assertions.assertThrows")
         val assertThat = im.getStatic("org.assertj.core.api.Assertions.assertThat")
         val recFuncF1 = if (i == 0) "11;" else s"i1 <= 0 ? i1 : $className.recurrent2.apply(${(1 to i).gen(j => s"i$j" + (j == 1).gen(s" - 1"))(", ")}) + 1;"
 
@@ -3315,11 +3316,13 @@ def generateTestClasses(): Unit = {
                       assertThat(md5.getDigestLength()).isEqualTo(16);
                   }
 
-                  @$test(expected = ${im.getType("java.security.NoSuchAlgorithmException")}.class)
+                  @$test
                   public void shouldThrowCheckedExceptionWhenUnchecked() {
-                      $name$i<MessageDigest> digest = () -> ${im.getType("java.security.MessageDigest")}.getInstance("Unknown");
-                      Function$i<MessageDigest> unchecked = digest.unchecked();
-                      unchecked.apply(); // Look ma, we throw an undeclared checked exception!
+                      $assertThrows(${im.getType("java.security.NoSuchAlgorithmException")}.class, () -> {
+                          $name$i<MessageDigest> digest = () -> ${im.getType("java.security.MessageDigest")}.getInstance("Unknown");
+                          Function$i<MessageDigest> unchecked = digest.unchecked();
+                          unchecked.apply(); // Look ma, we throw an undeclared checked exception!
+                      });
                   }
 
                   @$test
@@ -3381,10 +3384,12 @@ def generateTestClasses(): Unit = {
                           assertThat(md5.getDigestLength()).isEqualTo(16);
                       }
 
-                      @$test(expected = ${im.getType("java.security.NoSuchAlgorithmException")}.class)
+                      @$test
                       public void shouldUncheckedThrowIllegalState() {
-                          final Function$i<${(1 to i).gen(j => "String")(", ")}, MessageDigest> unchecked = digest.unchecked();
-                          unchecked.apply(${toArgList("Unknown")}); // Look ma, we throw an undeclared checked exception!
+                          $assertThrows(${im.getType("java.security.NoSuchAlgorithmException")}.class, () -> {
+                              final Function$i<${(1 to i).gen(j => "String")(", ")}, MessageDigest> unchecked = digest.unchecked();
+                              unchecked.apply(${toArgList("Unknown")}); // Look ma, we throw an undeclared checked exception!
+                          });
                       }
 
                       @$test
@@ -3464,7 +3469,7 @@ def generateTestClasses(): Unit = {
     def genAllArity(im: ImportManager,
                 mapName: String, mapBuilder: String,
                 builderComparator: Boolean, keyComparator: Boolean): String = {
-      val test = im.getType("org.junit.Test")
+      val test = im.getType("org.junit.jupiter.api.Test")
       val assertThat = im.getStatic("org.assertj.core.api.Assertions.assertThat")
       val naturalComparator = if (builderComparator || keyComparator) im.getStatic(s"io.vavr.collection.Comparators.naturalComparator") else null
       val map = im.getType(s"io.vavr.collection.$mapName")
@@ -3523,7 +3528,7 @@ def generateTestClasses(): Unit = {
 
       genVavrFile("io.vavr", s"Tuple${i}Test", baseDir = TARGET_TEST)((im: ImportManager, packageName, className) => {
 
-        val test = im.getType("org.junit.Test")
+        val test = im.getType("org.junit.jupiter.api.Test")
         val seq = im.getType("io.vavr.collection.Seq")
         val list = im.getType("io.vavr.collection.List")
         val stream = if (i == 0) "" else im.getType("io.vavr.collection.Stream")

src-gen/test/java/io/vavr/APITest.java

@@ -34,7 +34,7 @@
 import static io.vavr.OutputTester.captureStdOut;
 import static io.vavr.Patterns.*;
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import io.vavr.collection.List;
 import io.vavr.collection.Map;
@@ -47,7 +47,7 @@
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.concurrent.Executors;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 @SuppressWarnings("deprecation")
 public class APITest {

src-gen/test/java/io/vavr/CheckedFunction0Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction0Test {
 
@@ -158,11 +159,13 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldThrowCheckedExceptionWhenUnchecked() {
-        CheckedFunction0<MessageDigest> digest = () -> MessageDigest.getInstance("Unknown");
-        Function0<MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply(); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            CheckedFunction0<MessageDigest> digest = () -> MessageDigest.getInstance("Unknown");
+            Function0<MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply(); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction1Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction1Test {
 
@@ -168,10 +169,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function1<String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("Unknown"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function1<String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("Unknown"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction2Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction2Test {
 
@@ -167,10 +168,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function2<String, String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("U", "nknown"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function2<String, String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("U", "nknown"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction3Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction3Test {
 
@@ -168,10 +169,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function3<String, String, String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("U", "n", "known"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function3<String, String, String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("U", "n", "known"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction4Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction4Test {
 
@@ -169,10 +170,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function4<String, String, String, String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("U", "n", "k", "nown"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function4<String, String, String, String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("U", "n", "k", "nown"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction5Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction5Test {
 
@@ -170,10 +171,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function5<String, String, String, String, String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("U", "n", "k", "n", "own"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function5<String, String, String, String, String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("U", "n", "k", "n", "own"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test

src-gen/test/java/io/vavr/CheckedFunction6Test.java

@@ -31,13 +31,14 @@
 \*-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*/
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import io.vavr.control.Try;
 import java.lang.CharSequence;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 public class CheckedFunction6Test {
 
@@ -171,10 +172,12 @@ public void shouldUncheckedWork() {
         assertThat(md5.getDigestLength()).isEqualTo(16);
     }
 
-    @Test(expected = NoSuchAlgorithmException.class)
+    @Test
     public void shouldUncheckedThrowIllegalState() {
-        final Function6<String, String, String, String, String, String, MessageDigest> unchecked = digest.unchecked();
-        unchecked.apply("U", "n", "k", "n", "o", "wn"); // Look ma, we throw an undeclared checked exception!
+        assertThrows(NoSuchAlgorithmException.class, () -> {
+            final Function6<String, String, String, String, String, String, MessageDigest> unchecked = digest.unchecked();
+            unchecked.apply("U", "n", "k", "n", "o", "wn"); // Look ma, we throw an undeclared checked exception!
+        });
     }
 
     @Test