Debug Enso language in ChromeDev tools with --inspect option

build.sbt

@@ -155,7 +155,8 @@ Global / onChangedBuildSource := ReloadOnSourceChanges
 ThisBuild / javacOptions ++= Seq(
   "-encoding",   // Provide explicit encoding (the next line)
   "UTF-8",       // Specify character encoding used by Java source files.
-  "-deprecation" // Shows a description of each use or override of a deprecated member or class.
+  "-deprecation",// Shows a description of each use or override of a deprecated member or class.
+  "-g"           // Include debugging information
 )
 
 ThisBuild / scalacOptions ++= Seq(
@@ -1151,7 +1152,9 @@ lazy val runtime = (project in file("engine/runtime"))
       // This dependency is needed only so that developers don't download Frgaal manually.
       // Sadly it cannot be placed under plugins either because meta dependencies are not easily
       // accessible from the non-meta build definition.
-      FrgaalJavaCompiler.frgaal
+      FrgaalJavaCompiler.frgaal,
+     "junit" % "junit" % "4.12" % Test,
+     "com.novocode" % "junit-interface" % "0.11" % Test exclude("junit", "junit-dep")
     ),
     // Note [Unmanaged Classpath]
     Compile / unmanagedClasspath += (`core-definition` / Compile / packageBin).value,

engine/runtime/src/test/java/org/enso/interpreter/test/JavaPolyglotTest.java

@@ -0,0 +1,35 @@
+package org.enso.interpreter.test;
+
+import java.nio.file.Paths;
+import java.util.Map;
+import org.enso.polyglot.RuntimeOptions;
+import org.graalvm.polyglot.Context;
+import org.graalvm.polyglot.Engine;
+import org.graalvm.polyglot.Language;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class JavaPolyglotTest {
+  @Test
+  public void evaluation() {
+    Engine eng = Engine.newBuilder()
+      .allowExperimentalOptions(true)
+      .option(
+        RuntimeOptions.LANGUAGE_HOME_OVERRIDE,
+        Paths.get("../../distribution/component").toFile().getAbsolutePath()
+      ).build();
+    Context ctx = Context.newBuilder()
+      .engine(eng)
+      .allowIO(true)
+      .build();
+    final Map<String, Language> langs = ctx.getEngine().getLanguages();
+    org.junit.Assert.assertNotNull("Enso found: " + langs, langs.get("enso"));
+    var module = ctx.eval("enso", """
+    fac n =
+        if n <= 1 then 1 else n * here.fac n-1
+    """);
+    var facFn = module.invokeMember("eval_expression", "here.fac");
+    var fac5 = facFn.execute(5);
+    Assert.assertEquals("5!", 120, fac5.asInt());
+  }
+}