test: fix session id test

app/models/Session.java

@@ -24,7 +24,7 @@ public class Session extends Model {
 
 	@Id
 	@Constraints.MinLength(6)
-	public Integer id;
+	public String id;
 
 	private final int IDMIN = 100000;
 	private final int IDMAX = 1000000;
@@ -69,7 +69,7 @@ public class Session extends Model {
 			id = rnd.nextInt(IDMAX - IDMIN) + IDMIN;
 		} while (Session.find.byId(id.toString()) != null);
 
-		this.id = id;
+		this.id = id.toString();
 		this.owner = owner;
 		this.name = name;
 		this.open = true;

test/ModelTest.java

 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
 import models.QuestionAnswer;
 import models.Session;
 import models.Vote;
@@ -110,6 +111,7 @@ public class ModelTest {
 		Session s2 = new Session("owner1", "Session2");
 		s1.save();
 		s2.save();
-		assertEquals(5, s1.id.length());
+		assertEquals(6, s1.id.length());
+		assertNotEquals(s1.id, s2.id);
 	}
 }