iluwatar#539 Checkstyle fix

Author: iluwatar

balking/src/test/java/com/iluwatar/balking/WashingMachineTest.java

@@ -30,6 +30,9 @@
 
 import static org.junit.Assert.*;
 
+/**
+ * Tests for {@link WashingMachine}
+ */
 public class WashingMachineTest {
 
   private volatile WashingMachineState machineStateGlobal;