try to fix test execution

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/org.eclipse.vex.core.tests/pom.xml b/org.eclipse.vex.core.tests/pom.xml
index c19ceff..4dfaf79 100644
--- a/org.eclipse.vex.core.tests/pom.xml
+++ b/org.eclipse.vex.core.tests/pom.xml
@@ -12,5 +12,20 @@
 		<version>1.1.0-SNAPSHOT</version>
 		<relativePath>../org.eclipse.vex.releng/pom.xml</relativePath>
 	</parent>
-	
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.eclipse.tycho</groupId>
+				<artifactId>tycho-surefire-plugin</artifactId>
+				<version>${tycho-version}</version>
+				<configuration>
+					<useUIHarness>true</useUIHarness>
+					<testSuite>org.eclipse.vex.core.tests</testSuite>
+					<testClass>org.eclipse.vex.core.tests.VEXCoreTestSuite</testClass>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
 </project>
diff --git a/org.eclipse.vex.ui.tests/pom.xml b/org.eclipse.vex.ui.tests/pom.xml
index 59bb2d2..55d00cf 100644
--- a/org.eclipse.vex.ui.tests/pom.xml
+++ b/org.eclipse.vex.ui.tests/pom.xml
@@ -12,5 +12,20 @@
 		<version>1.1.0-SNAPSHOT</version>
 		<relativePath>../org.eclipse.vex.releng/pom.xml</relativePath>
 	</parent>
-	
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.eclipse.tycho</groupId>
+				<artifactId>tycho-surefire-plugin</artifactId>
+				<version>${tycho-version}</version>
+				<configuration>
+					<useUIHarness>true</useUIHarness>
+					<testSuite>org.eclipse.vex.ui.tests</testSuite>
+					<testClass>org.eclipse.vex.ui.tests.VexUiTestSuite</testClass>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+		
 </project>