Add heap size for tests
diff --git a/pom.xml b/pom.xml
index 7c5abba..3f7ab27 100644
--- a/pom.xml
+++ b/pom.xml
@@ -87,6 +87,7 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.6</version>
                 <configuration>
+                    <argLine>-Xmx512m</argLine>
                     <includes>
                         <include>**/*Test.java</include>
                     </includes>