diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index f77092d..ba51e35 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -12,6 +12,8 @@ mod setup_test;
 #[cfg(test)]
 mod curriculum_test;
 pub mod systems;
+#[cfg(test)]
+mod systems_test;
 pub mod target;
 
 use bevy::prelude::*;
diff --git a/src/ui/systems_test.rs b/src/ui/systems_test.rs
new file mode 100644
index 0000000..54b1daa
--- /dev/null
+++ b/src/ui/systems_test.rs
@@ -0,0 +1,35 @@
+use bevy::prelude::*;
+use bevy::app::TaskPoolPlugin;
+use crate::components::CurriculumGradeButton;
+use crate::resources::CurriculumState;
+use crate::ui::systems::curriculum_grade_system;
+
+#[test]
+fn test_curriculum_grade_system() {
+    let mut app = App::new();
+    app.add_plugins(TaskPoolPlugin::default());
+
+    // Setup initial state
+    let mut state = CurriculumState::default();
+    state.selected_grade = Some("Niveau 1.1".to_string());
+    state.selected_document = Some("Passage de Grade 1.1".to_string());
+    app.insert_resource(state);
+
+    // Spawn button with pressed interaction
+    app.world_mut().spawn((
+        CurriculumGradeButton,
+        Interaction::Pressed,
+    ));
+
+    app.add_systems(Update, curriculum_grade_system);
+
+    // Run app to process the interaction
+    app.update();
+
+    let new_state = app.world().resource::<CurriculumState>();
+
+    // According to CURRICULUM_MANIFEST, the grades sorted are "Niveau 1.1" and "Niveau 1.2"
+    // So if current is "Niveau 1.1", next should be "Niveau 1.2"
+    assert_eq!(new_state.selected_grade, Some("Niveau 1.2".to_string()));
+    assert_eq!(new_state.selected_document, Some("Passage de grade 1.2".to_string()));
+}