Turn event into an interface, add TestEvent for test

src/main/java/nl/grum/microcraft/Event.java

@@ -1,4 +1,5 @@
 package nl.grum.microcraft;
 
-public class Event  {
+public interface Event<L>  {
+    void notify(final L listener);
 }

src/test/java/nl/grum/microcraft/EventTest.java

@@ -1,22 +1,25 @@
 package nl.grum.microcraft;
 
-import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 
 import org.junit.Before;
 import org.junit.Test;
 
 public class EventTest {
 
-    private Event subject;
+    private static final String STRING = "foo";
+    private TestEvent subject;
 
     @Before
     public void setup() {
-        subject = new Event();
+        subject = new TestEvent(STRING);
     }
 
     @Test
-    public void stupidTest() {
-        assertThat(subject, notNullValue());
+    public void eventHasStringData() {
+        assertNotNull(subject.getString());
+        assertThat(subject.getString(), is(STRING));
     }
 }

src/test/java/nl/grum/microcraft/ServerTest.java

@@ -24,18 +24,18 @@ public void queueStartsEmtpy() {
 
     @Test
     public void addEventToQueue() {
-        Event e = new Event();
+        Event<?> e = new TestEvent("foo");
 
         subject.queueEvent(e);
         assertTrue(subject.peekEvent());
     }
 
     @Test
     public void removeEventFromQueue() {
-        Event e1 = new Event();
+        Event<?> e1 = new TestEvent("foo");
         subject.queueEvent(e1);
 
-        Event e2 = subject.pollEvent();
+        Event<?> e2 = subject.pollEvent();
         assertFalse(subject.peekEvent());
         assertEquals(e1, e2);
     }