1 files changed, 4 insertions, 5 deletions
diff --git a/src/test/java/au/id/zancanaro/javacheck/state/queue/commands/Offer.java b/src/test/java/au/id/zancanaro/javacheck/state/queue/commands/Offer.java
index 366e974..3f21547 100644
--- a/src/test/java/au/id/zancanaro/javacheck/state/queue/commands/Offer.java
+++ b/src/test/java/au/id/zancanaro/javacheck/state/queue/commands/Offer.java
@@ -8,7 +8,7 @@ import au.id.zancanaro.javacheck.state.queue.QueueState;
 import java.util.ArrayList;
 import java.util.List;
 
-public class Offer<T> extends Command<QueueState<T>, T, Void> {
+public class Offer<T> extends Command<QueueState<T>, T, Boolean> {
     public final Generator<T> generator;
 
     public Offer(Generator<T> argGen) {
@@ -26,13 +26,12 @@ public class Offer<T> extends Command<QueueState<T>, T, Void> {
     }
 
     @Override
-    public Void runCommand(QueueState<T> state, T args) {
-        state.getConcreteQueue().offer(args);
-        return null;
+    public Boolean runCommand(QueueState<T> state, T args) {
+        return state.getConcreteQueue().offer(args);
     }
 
     @Override
-    public QueueState<T> nextState(QueueState<T> state, T args, CommandValue<Void> result) {
+    public QueueState<T> nextState(QueueState<T> state, T args, CommandValue<Boolean> result) {
         List<T> newState = new ArrayList<>(state.getAbstractQueue());
         newState.add(args);
         return state.withAbstractQueue(newState);