diff --git a/nexosim/src/model/context.rs b/nexosim/src/model/context.rs
index 2d593e6..0555d99 100644
--- a/nexosim/src/model/context.rs
+++ b/nexosim/src/model/context.rs
@@ -8,6 +8,9 @@ use crate::time::{Deadline, MonotonicTime};
 
 use super::{Model, ProtoModel};
 
+#[cfg(all(test, not(nexosim_loom)))]
+use crate::channel::Receiver;
+
 /// A local context for models.
 ///
 /// A `Context` is a handle to the global context associated to a model
@@ -521,3 +524,16 @@ impl<'a, P: ProtoModel> BuildContext<'a, P> {
         );
     }
 }
+
+#[cfg(all(test, not(nexosim_loom)))]
+impl<M: Model> Context<M> {
+    /// Creates a dummy context for testing purposes.
+    pub(crate) fn new_dummy() -> Self {
+        let dummy_address = Receiver::new(1).sender();
+        Context::new(
+            String::new(),
+            GlobalScheduler::new_dummy(),
+            Address(dummy_address),
+        )
+    }
+}
diff --git a/nexosim/src/ports/output/broadcaster.rs b/nexosim/src/ports/output/broadcaster.rs
index 77db015..4da1d4a 100644
--- a/nexosim/src/ports/output/broadcaster.rs
+++ b/nexosim/src/ports/output/broadcaster.rs
@@ -503,17 +503,13 @@ fn recycle_vec<T, U>(mut v: Vec<T>) -> Vec<U> {
 
 #[cfg(all(test, not(nexosim_loom)))]
 mod tests {
-    use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
-    use std::sync::{Arc, Mutex};
+    use std::sync::atomic::{AtomicUsize, Ordering};
+    use std::sync::Arc;
     use std::thread;
 
     use futures_executor::block_on;
 
     use crate::channel::Receiver;
-    use crate::simulation::{Address, GlobalScheduler};
-    use crate::time::{MonotonicTime, TearableAtomicTime};
-    use crate::util::priority_queue::PriorityQueue;
-    use crate::util::sync_cell::SyncCell;
 
     use super::super::sender::{
         FilterMapInputSender, FilterMapReplierSender, InputSender, ReplierSender,
@@ -574,16 +570,7 @@ mod tests {
                     let mut sum_model = SumModel::new(sum.clone());
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(mailbox.recv(&mut sum_model, &mut dummy_cx)).unwrap();
                     }
                 })
@@ -645,16 +632,7 @@ mod tests {
                     let mut sum_model = SumModel::new(sum.clone());
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(async {
                             mailbox.recv(&mut sum_model, &mut dummy_cx).await.unwrap();
                             mailbox.recv(&mut sum_model, &mut dummy_cx).await.unwrap();
@@ -706,16 +684,7 @@ mod tests {
                     let mut double_model = DoubleModel::new();
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(mailbox.recv(&mut double_model, &mut dummy_cx)).unwrap();
                         thread::sleep(std::time::Duration::from_millis(100));
                     }
@@ -792,16 +761,7 @@ mod tests {
                     let mut double_model = DoubleModel::new();
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
 
                         block_on(async {
                             mailbox
diff --git a/nexosim/src/ports/source/broadcaster.rs b/nexosim/src/ports/source/broadcaster.rs
index f221e63..69c91ed 100644
--- a/nexosim/src/ports/source/broadcaster.rs
+++ b/nexosim/src/ports/source/broadcaster.rs
@@ -398,17 +398,13 @@ impl<R> Iterator for ReplyIterator<R> {
 
 #[cfg(all(test, not(nexosim_loom)))]
 mod tests {
-    use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
-    use std::sync::{Arc, Mutex};
+    use std::sync::atomic::{AtomicUsize, Ordering};
+    use std::sync::Arc;
     use std::thread;
 
     use futures_executor::block_on;
 
     use crate::channel::Receiver;
-    use crate::simulation::{Address, GlobalScheduler};
-    use crate::time::{MonotonicTime, TearableAtomicTime};
-    use crate::util::priority_queue::PriorityQueue;
-    use crate::util::sync_cell::SyncCell;
 
     use super::super::sender::{
         FilterMapInputSender, FilterMapReplierSender, InputSender, ReplierSender,
@@ -469,16 +465,7 @@ mod tests {
                     let mut sum_model = SumModel::new(sum.clone());
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(mailbox.recv(&mut sum_model, &mut dummy_cx)).unwrap();
                     }
                 })
@@ -540,16 +527,7 @@ mod tests {
                     let mut sum_model = SumModel::new(sum.clone());
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(async {
                             mailbox.recv(&mut sum_model, &mut dummy_cx).await.unwrap();
                             mailbox.recv(&mut sum_model, &mut dummy_cx).await.unwrap();
@@ -601,16 +579,7 @@ mod tests {
                     let mut double_model = DoubleModel::new();
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
                         block_on(mailbox.recv(&mut double_model, &mut dummy_cx)).unwrap();
                         thread::sleep(std::time::Duration::from_millis(100));
                     }
@@ -687,16 +656,7 @@ mod tests {
                     let mut double_model = DoubleModel::new();
 
                     move || {
-                        let dummy_address = Receiver::new(1).sender();
-                        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
-                        let dummy_time =
-                            SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
-                        let dummy_halter = Arc::new(AtomicBool::new(false));
-                        let mut dummy_cx = Context::new(
-                            String::new(),
-                            GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter),
-                            Address(dummy_address),
-                        );
+                        let mut dummy_cx = Context::new_dummy();
 
                         block_on(async {
                             mailbox
diff --git a/nexosim/src/simulation/scheduler.rs b/nexosim/src/simulation/scheduler.rs
index eaa90a4..e8c2073 100644
--- a/nexosim/src/simulation/scheduler.rs
+++ b/nexosim/src/simulation/scheduler.rs
@@ -20,6 +20,9 @@ use crate::simulation::Address;
 use crate::time::{AtomicTimeReader, Deadline, MonotonicTime};
 use crate::util::priority_queue::PriorityQueue;
 
+#[cfg(all(test, not(nexosim_loom)))]
+use crate::{time::TearableAtomicTime, util::sync_cell::SyncCell};
+
 const GLOBAL_SCHEDULER_ORIGIN_ID: usize = 0;
 
 /// A global scheduler.
@@ -834,3 +837,14 @@ pub(crate) async fn send_keyed_event<M, F, T, S>(
         )
         .await;
 }
+
+#[cfg(all(test, not(nexosim_loom)))]
+impl GlobalScheduler {
+    /// Creates a dummy scheduler for testing purposes.
+    pub(crate) fn new_dummy() -> Self {
+        let dummy_priority_queue = Arc::new(Mutex::new(PriorityQueue::new()));
+        let dummy_time = SyncCell::new(TearableAtomicTime::new(MonotonicTime::EPOCH)).reader();
+        let dummy_halter = Arc::new(AtomicBool::new(false));
+        GlobalScheduler::new(dummy_priority_queue, dummy_time, dummy_halter)
+    }
+}