Скачать или смотреть Access jdk.unsupported from JUnit doesn't need module require

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I'm trying to figure out why JUnit behaves differently from a 'regular' Java program with respect to the jdk.unsupported module. And yes, I know I shouldn't be using this. I'm just trying (and failing) to understand how things work.
jdk.unsupported
I have this program:
public class UnsafeAttempt {
public static void main(String[] args) {
try {
Class.forName("sun.reflect.ReflectionFactory");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
}

public class UnsafeAttempt {
public static void main(String[] args) {
try {
Class.forName("sun.reflect.ReflectionFactory");
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
}

When run on the modulepath, this throws a java.lang.ClassNotFoundException, which I expect. When I add requires jdk.unsupported; to module-info.java, it runs without problems, which I also expect.
java.lang.ClassNotFoundException
requires jdk.unsupported;
module-info.java
But if I put it in a unit test:
import org.junit.jupiter.api.Test;

public class UnsafeTest {
@Test
public void sunreflect() throws Exception {
Class.forName("sun.reflect.ReflectionFactory");
}
}

import org.junit.jupiter.api.Test;

public class UnsafeTest {
@Test
public void sunreflect() throws Exception {
Class.forName("sun.reflect.ReflectionFactory");
}
}

With this module-info.java file in src/test/java:
module-info.java
src/test/java
open module my.module {
exports my.module;

requires org.junit.jupiter.api;
}

open module my.module {
exports my.module;

requires org.junit.jupiter.api;
}

This works without adding requires jdk.unsupported;, and I don't understand why.
without
requires jdk.unsupported;
I see this behaviour in both IntelliJ and Maven. I haven't configured the Maven Surefire plugin in any way.
What does JUnit or Surefure (or something else) do to make this work?
EDIT: I've created a GitHub repo with a reproducer, to make it easier to try this: https://github.com/jqno/modules-are-c...
EDIT
https://github.com/jqno/modules-are-c...


Tags: java,junit5,java-platform-module-systemSource of the question:
https://stackoverflow.com/questions/7...

Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/