Style fix

Author: meza

core/src/test/java/cucumber/runtime/UndefinedStepsTrackerTest.java

@@ -10,7 +10,9 @@
 import java.util.List;
 
 import static java.util.Arrays.asList;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 
 public class UndefinedStepsTrackerTest {