From cd4c9e87285a6d7db451407277f26046b1d287c5 Mon Sep 17 00:00:00 2001
From: parrt <parrt@cs.usfca.edu>
Date: Wed, 30 Nov 2016 08:27:05 -0800
Subject: [PATCH] Add heartbeat thread to gen minimal output for travis,
 appveyor to avoid timeout.

---
 .../v4/test/runtime/BaseRuntimeTest.java      | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/runtime-testsuite/test/org/antlr/v4/test/runtime/BaseRuntimeTest.java b/runtime-testsuite/test/org/antlr/v4/test/runtime/BaseRuntimeTest.java
index de5096025..e0b5768a9 100644
--- a/runtime-testsuite/test/org/antlr/v4/test/runtime/BaseRuntimeTest.java
+++ b/runtime-testsuite/test/org/antlr/v4/test/runtime/BaseRuntimeTest.java
@@ -49,6 +49,26 @@ public abstract class BaseRuntimeTest {
 		"Node", "Safari", "Firefox", "Explorer", "Chrome"
 	};
 
+	static {
+		// Add heartbeat thread to gen minimal output for travis, appveyor to
+		// avoid timeout.
+		Thread t = new Thread("heartbeat") {
+			@Override
+			public void run() {
+				while (true) {
+					System.out.print('.');
+					try {
+						Thread.sleep(5000);
+					}
+					catch (Exception e) {
+						e.printStackTrace();
+					}
+				}
+			}
+		};
+		t.start();
+	}
+
 	/** ANTLR isn't thread-safe to process grammars so we use a global lock for testing */
 	public static final Object antlrLock = new Object();