unittest: Edited test for QuizCommand

This test tests whether the canPlayAgain function works or not

src/test/java/org/bitbiome/commands/QuizCommandTest.java

@@ -2,7 +2,7 @@ package org.bitbiome.commands;
 
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.*;
 
 public class QuizCommandTest {
 
@@ -15,4 +15,10 @@ public class QuizCommandTest {
     public void testEndMessage() {
         assertEquals("Das Quiz ist vorbei!", QuizCommand.endMessage());
     }
+
+    @Test
+    public void testLastTimePlayed() {
+        long lastTimePlayed = System.currentTimeMillis();
+        assertTrue(QuizCommand.canPlayAgain(lastTimePlayed) < lastTimePlayed);
+    }
 }