Configure surefire for both junit and testng

References #107.

pom.xml

@@ -173,7 +173,19 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>2.19</version>
+        <version>${surefire.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit47</artifactId>
+            <version>${surefire.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-testng</artifactId>
+            <version>${surefire.version}</version>
+          </dependency>
+        </dependencies>
         <configuration>
           <parallel>all</parallel>
           <threadCount>1</threadCount>
@@ -243,6 +255,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>1.7</java.version>
     <jclouds.version>2.0.0-SNAPSHOT</jclouds.version>
+    <surefire.version>2.19</surefire.version>
   </properties>
 
   <prerequisites>