--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/api/consumer/recordingstream/TestUtils.java	Wed Oct 30 19:43:52 2019 +0100
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.api.consumer.recordingstream;
+
+import java.util.concurrent.CountDownLatch;
+
+public class TestUtils {
+
+    public static final class TestError extends Error {
+        private static final long serialVersionUID = 1L;
+    }
+
+    public static final class TestException extends Exception {
+        private static final long serialVersionUID = 1L;
+        private volatile boolean printed;
+
+        @Override
+        public void printStackTrace() {
+            super.printStackTrace();
+            printed = true;
+        }
+
+        public boolean isPrinted() {
+            return printed;
+        }
+    }
+
+    // Can throw checked exception as unchecked.
+    @SuppressWarnings("unchecked")
+    public static <T extends Throwable> void throwUnchecked(Throwable e) throws T {
+        throw (T) e;
+    }
+
+    public static void installUncaughtException(CountDownLatch receivedError, Throwable expected) {
+        Thread.currentThread().setUncaughtExceptionHandler((thread, throwable) -> {
+            if (throwable == expected) {
+                System.out.println("Received uncaught exception " + expected.getClass());
+                receivedError.countDown();
+            }
+        });
+    }
+}