Use process pool for test runner (0.12.x) (#4679)

ported for 0.12.x from #4614

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

.gitignore

@@ -18,4 +18,6 @@ dist/
 build/
 *.bak
 mill-assembly.jar
-mill-native
+mill-native
+*.mill.orig
+*.mill.rej

docs/modules/ROOT/pages/javalib/testing.adoc

@@ -22,6 +22,13 @@ include::partial$example/javalib/testing/3-integration-suite.adoc[]
 
 include::partial$example/javalib/testing/4-test-grouping.adoc[]
 
+== Test Work Stealing Scheduler
+
+include::partial$example/javalib/testing/5-test-stealing.adoc[]
+
+== Test Grouping & Test Work Stealing
+
+include::partial$example/javalib/testing/6-test-group-stealing.adoc[]
 
 == Github Actions Test Reports
 

docs/modules/ROOT/pages/kotlinlib/testing.adoc

@@ -22,6 +22,13 @@ include::partial$example/kotlinlib/testing/3-integration-suite.adoc[]
 
 include::partial$example/kotlinlib/testing/4-test-grouping.adoc[]
 
+== Test Work Stealing Scheduler
+
+include::partial$example/kotlinlib/testing/5-test-stealing.adoc[]
+
+== Test Grouping & Test Work Stealing
+
+include::partial$example/kotlinlib/testing/6-test-group-stealing.adoc[]
 
 == Github Actions Test Reports
 

docs/modules/ROOT/pages/scalalib/testing.adoc

@@ -22,6 +22,14 @@ include::partial$example/scalalib/testing/3-integration-suite.adoc[]
 
 include::partial$example/scalalib/testing/4-test-grouping.adoc[]
 
+== Test Work Stealing Scheduler
+
+include::partial$example/scalalib/testing/5-test-stealing.adoc[]
+
+== Test Grouping & Test Work Stealing
+
+include::partial$example/scalalib/testing/6-test-group-stealing.adoc[]
+
 == Github Actions Test Reports
 
 If you use Github Actions for CI, you can use https://github.com/mikepenz/action-junit-report in

example/javalib/testing/5-test-stealing/build.mill

@@ -0,0 +1,15 @@
+//// SNIPPET:BUILD1
+package build
+import mill._, javalib._
+
+object foo extends JavaModule {
+  object test extends JavaTests {
+    def testFramework = "com.novocode.junit.JUnitFramework"
+    def ivyDeps = Agg(
+      ivy"com.novocode:junit-interface:0.11",
+      ivy"org.mockito:mockito-core:4.6.1"
+    )
+    def testEnableWorkStealing = true
+  }
+}
+//// SNIPPET:END

example/javalib/testing/5-test-stealing/foo/src/foo/Foo.java

@@ -0,0 +1,11 @@
+package foo;
+
+public class Foo {
+  public static void main(String[] args) {
+    System.out.println(greet("World"));
+  }
+
+  public static String greet(String name) {
+    return "Hello " + name;
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsA.java

@@ -0,0 +1,11 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsA extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Storm", 38);
+  }
+  // Removed other tests to simplify
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsB.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsB extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Dakota", 18);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsC.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsC extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Jordan", 95);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsD.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsD extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Kai", 14);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsE.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsE extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Sage", 28);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsF.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsF extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Winter", 12);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsG.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsG extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Finn", 45);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsH.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsH extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Haven", 22);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsI.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsI extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Mars", 16);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsJ.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class RandomTestsJ extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Storm", 38);
+  }
+}

example/javalib/testing/5-test-stealing/foo/test/src/foo/RandomTestsUtils.java

@@ -0,0 +1,11 @@
+package foo;
+
+import static org.junit.Assert.assertEquals;
+
+public class RandomTestsUtils {
+  protected void testGreeting(String name, int sleepTime) throws Exception {
+    String greeted = Foo.greet(name);
+    Thread.sleep(sleepTime);
+    assertEquals("Hello " + name, greeted);
+  }
+}

example/javalib/testing/6-test-group-stealing/build.mill

@@ -0,0 +1,19 @@
+//// SNIPPET:BUILD1
+package build
+import mill._, javalib._
+
+object foo extends JavaModule {
+  object test extends JavaTests {
+    def testFramework = "com.novocode.junit.JUnitFramework"
+    def ivyDeps = Agg(
+      ivy"com.novocode:junit-interface:0.11",
+      ivy"org.mockito:mockito-core:4.6.1"
+    )
+    def testForkGrouping =
+      discoveredTestClasses().groupMapReduce(_.contains("GroupX"))(Seq(_))(_ ++ _).toSeq.sortBy(
+        data => !data._1
+      ).map(_._2)
+    def testEnableWorkStealing = true
+  }
+}
+//// SNIPPET:END

example/javalib/testing/6-test-group-stealing/foo/src/foo/Foo.java

@@ -0,0 +1,11 @@
+package foo;
+
+public class Foo {
+  public static void main(String[] args) {
+    System.out.println(greet("World"));
+  }
+
+  public static String greet(String name) {
+    return "Hello " + name;
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX1.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX1 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Aether", 55);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX10.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX10 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Echo", 52);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX2.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX2 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Chronos", 35);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX3.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX3 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Fortuna", 25);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX4.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX4 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Janus", 21);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX5.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX5 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Orion", 95);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX6.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX6 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Perseus", 34);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX7.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX7 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Selene", 52);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX8.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX8 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Uranus", 25);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupX9.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupX9 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Ymir", 17);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupY1.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupY1 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Hades", 15);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupY10.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupY10 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Rama", 25);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupY2.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupY2 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Odin", 34);
+  }
+}

example/javalib/testing/6-test-group-stealing/foo/test/src/foo/GroupY3.java

@@ -0,0 +1,10 @@
+package foo;
+
+import org.junit.Test;
+
+public class GroupY3 extends RandomTestsUtils {
+  @Test
+  public void test1() throws Exception {
+    testGreeting("Ra", 21);
+  }
+}