Merge pull request #391 from superklamer/robot-name

robot-name: avoid test pollution [Fix #362]

exercises/robot-name/src/test/java/RobotTest.java

 import org.junit.Test;
 import org.junit.Ignore;
+import org.junit.Before;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.core.Is.is;
 public class RobotTest {
 
     private static final String EXPECTED_ROBOT_NAME_PATTERN = "[A-Z]{2}\\d{3}";
-    private final Robot robot = new Robot();
+    private Robot robot;
 
+    @Before
+    public void setUp() {
+      robot = new Robot();
+    }
 
     @Test
     public void hasName() {