First try with Java.

.github/workflows/Java.yml

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+name: Java
+
+on:
+  push:
+
+jobs:
+  Ant:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up JDK 11 for x64
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+          architecture: x64
+      - name: Prepare
+        run: find / -name "*.jar" 2>/dev/null| grep -P '(junit|hamcrest)'
+      - name: Run the Ant 'junit' target
+        run: ant -noinput -buildfile build.xml junit
+      - name: Debug
+        run: ls -lAh build

examples/Java/JUnitTest/build.xml

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+<project name="MyProject" default="junit" basedir=".">
+	<description>
+    simple example build file
+  </description>
+
+	<property name="src" location="src" />
+	<property name="test" location="test" />
+	<property name="build" location="build" />
+
+	<target name="init">
+		<tstamp />
+		<mkdir dir="${build}" />
+	</target>
+
+	<target name="compile" depends="init" description="compile the source">
+		<javac destdir="${build}" includeantruntime="false">
+			<src path="${src}" />
+			<src path="${test}" />
+			<classpath>
+				<pathelement location="/usr/share/java/junit.jar"/>
+			</classpath>
+		</javac>
+	</target>
+
+	<target name="junit" depends="compile">
+		<junit haltonerror="true" printsummary="true">
+			<classpath>
+				<pathelement location="/usr/share/java/junit.jar"/>
+				<pathelement location="/usr/share/java/hamcrest-core.jar"/>
+				<pathelement location="${build}"/>
+			</classpath>
+			<formatter type="xml"/>
+		    <batchtest fork="false" todir="${build}">
+		        <fileset dir="${test}">
+		            <include name="**/*Test.java"/>
+		            <include name="**/AllTests.java"/>
+		        </fileset>
+		    </batchtest>
+		</junit>
+	</target>
+
+	<target name="clean" description="clean up">
+		<delete dir="${build}" />
+		<delete dir="${dist}" />
+	</target>
+</project>

examples/Java/JUnitTest/src/my/pack/MyClass.java

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+package my.pack;
+
+public class MyClass {
+	boolean returnTrue() {
+		return false;
+	}
+}

examples/Java/JUnitTest/src/my/pack/OtherClass.java

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+package my.pack;
+
+public class OtherClass {
+	int returnThree() {
+		return 3;
+	}
+}

examples/Java/JUnitTest/test/my/AllTests.java

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+package my;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+import org.junit.runners.Suite.SuiteClasses;
+
+@RunWith(Suite.class)
+@SuiteClasses({ my.pack.AllTests.class })
+public class AllTests {
+
+}

examples/Java/JUnitTest/test/my/pack/AllTests.java

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+package my.pack;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+import org.junit.runners.Suite.SuiteClasses;
+
+@RunWith(Suite.class)
+@SuiteClasses({ MyClassTest.class, OtherClassTest.class })
+public class AllTests {
+
+}

examples/Java/JUnitTest/test/my/pack/MyClassTest.java

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+package my.pack;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class MyClassTest {
+
+	@Test
+	public void testReturnTrue() {
+		assertTrue(new MyClass().returnTrue());
+	}
+
+}

examples/Java/JUnitTest/test/my/pack/OtherClassTest.java

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+package my.pack;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class OtherClassTest {
+
+	@Test
+	public void testReturnThree() {
+		assertEquals(3, new OtherClass().returnThree());
+	}
+
+}