Mac specific test options

tycho_build.gradle

+import org.apache.tools.ant.taskdefs.condition.Os
 /*
 	Build Script can be executed via 'gradle install'
 	Build Script Dependencies can be downloaded via 'gradle collectDepenencies'
@@ -599,11 +600,25 @@ task tycho(dependsOn: [createPoms] , type:Exec) {
 					<plugin>
 						<groupId>org.eclipse.tycho</groupId>
 						<artifactId>tycho-surefire-plugin</artifactId>
+	        				<configuration>
+							<!-- <useUIHarness>true</useUIHarness> -->
+							<!-- <useUIThread>true</useUIThread> -->
+							${macTestArguments()}
+							<!-- <product>org.rodinp.platform.product</product> -->
+	        				</configuration>
 	      				</plugin>
 	    			</plugins>
 	 		</build>
 		""" }
 		
+	String macTestArguments() {
+		if ( Os.isFamily(Os.FAMILY_MAC) ){
+			return "<argLine>-XstartOnFirstThread</argLine>\n"
+		}else{
+			return "\n"
+		}
+	}
+	
 			
 	def start() { """<?xml version="1.0" encoding="UTF-8"?>
 	<project