Added tests

crates/bevy_ecs/src/query/fetch.rs

@@ -1811,6 +1811,7 @@ unsafe impl<'__w, T: Component> QueryData for Mut<'__w, T> {
 /// # use bevy_ecs::prelude::*;
 /// # use bevy_ecs::query::QueryData;
 /// # use bevy_ecs::query::DataSet;
+/// # use bevy_ecs::query::QueryItem;
 /// #
 /// # #[derive(Component)]
 /// # struct Transform;
@@ -1825,7 +1826,7 @@ unsafe impl<'__w, T: Component> QueryData for Mut<'__w, T> {
 /// impl Behavior for Run {
 ///     type Data = &'static mut Transform;
 ///
-///     fn update(&mut self, data: &mut Transform) {
+///     fn update(&mut self, data: &mut QueryItem<'_, Self::Data>) {
 ///         // Do something...
 ///     }
 /// }
@@ -1835,7 +1836,7 @@ unsafe impl<'__w, T: Component> QueryData for Mut<'__w, T> {
 /// impl Behavior for Jump {
 ///     type Data = &'static mut Transform;
 ///
-///     fn update(&mut self, data: &mut Transform) {
+///     fn update(&mut self, data: &mut QueryItem<'_, Self::Data>) {
 ///         // Do something different...
 ///     }
 /// }

crates/bevy_ecs/src/system/mod.rs

@@ -320,7 +320,7 @@ mod tests {
         component::{Component, Components, Tick},
         entity::{Entities, Entity},
         prelude::{AnyOf, EntityRef},
-        query::{Added, Changed, Or, With, Without},
+        query::{Added, Changed, Or, With, Without, DataSet},
         removal_detection::RemovedComponents,
         schedule::{
             apply_deferred, common_conditions::resource_exists, Condition, IntoSystemConfigs,
@@ -810,6 +810,32 @@ mod tests {
         run_system(&mut world, sys);
     }
 
+
+    #[test]
+    fn data_set_system() {
+        fn sys(mut _query: Query<DataSet<(&mut A, &A)>>) {}
+        let mut world = World::default();
+        run_system(&mut world, sys);
+    }
+
+    #[test]
+    #[should_panic]
+    fn conflicting_query_with_data_set_system() {
+        fn sys(_query_1: Query<&mut A>, _query_2: Query<DataSet<(&mut A, &B)>>) {}
+
+        let mut world = World::default();
+        run_system(&mut world, sys);
+    }
+
+    #[test]
+    #[should_panic]
+    fn conflicting_data_sets_system() {
+        fn sys(_query_1: Query<DataSet<(&mut A,)>>, _query_2: Query<DataSet<(&mut A, &B)>>) {}
+
+        let mut world = World::default();
+        run_system(&mut world, sys);
+    }
+
     #[derive(Default, Resource)]
     struct BufferRes {
         _buffer: Vec<u8>,