Fix usage of TimeoutExtension from module path

Author: marcphilipp

junit-jupiter-engine/src/module/org.junit.jupiter.engine/module-info.java

@@ -20,4 +20,6 @@
 
 	provides org.junit.platform.engine.TestEngine
 			with org.junit.jupiter.engine.JupiterTestEngine;
+
+	opens org.junit.jupiter.engine.extension to org.junit.platform.commons;
 }

platform-tooling-support-tests/src/test/java/platform/tooling/support/tests/ModularUserGuideTests.java

@@ -13,6 +13,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertLinesMatch;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.File;
 import java.io.PrintWriter;
@@ -139,10 +140,16 @@ private static List<String> junit(Path temp, Writer out, Writer err) throws Exce
 
 		var builder = new ProcessBuilder(command).directory(temp.toFile());
 		// var java = builder.inheritIO().start(); // show "console" output and errors
-		var java = builder.redirectErrorStream(true).redirectOutput(ProcessBuilder.Redirect.DISCARD).start();
+		var java = builder.start();
 		var code = java.waitFor();
 
-		assertEquals(0, code, out.toString());
+		if (code != 0) {
+			System.out.println(out);
+			System.err.println(err);
+			System.out.println(new String(java.getInputStream().readAllBytes()));
+			System.err.println(new String(java.getErrorStream().readAllBytes()));
+			fail("Unexpected exit code: " + code);
+		}
 		return command;
 	}