Add tests to ensure that short type paths can fetch the processor.

Author: andriyDev

crates/bevy_asset/src/processor/mod.rs

@@ -1633,7 +1633,7 @@ pub enum SetTransactionLogFactoryError {
 }
 
 /// An error when retrieving an asset processor.
-#[derive(Error, Debug)]
+#[derive(Error, Debug, PartialEq, Eq)]
 pub enum GetProcessorError {
     #[error("The processor '{0}' does not exist")]
     Missing(String),
@@ -1658,3 +1658,139 @@ impl From<GetProcessorError> for ProcessError {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use bevy_reflect::TypePath;
+    use core::marker::PhantomData;
+
+    use crate::io::memory::{Dir, MemoryAssetReader};
+
+    use super::*;
+
+    #[derive(TypePath)]
+    struct MyProcessor<T>(PhantomData<fn() -> T>);
+
+    impl<T: TypePath + 'static> Process for MyProcessor<T> {
+        type OutputLoader = ();
+        type Settings = ();
+
+        async fn process(
+            &self,
+            _context: &mut ProcessContext<'_>,
+            _meta: AssetMeta<(), Self>,
+            _writer: &mut crate::io::Writer,
+        ) -> Result<(), ProcessError> {
+            Ok(())
+        }
+    }
+
+    #[derive(TypePath)]
+    struct Marker;
+
+    fn create_empty_asset_processor() -> AssetProcessor {
+        let mut sources = AssetSourceBuilders::default();
+        // Create an empty asset source so that AssetProcessor is happy.
+        let dir = Dir::default();
+        let memory_reader = MemoryAssetReader { root: dir.clone() };
+        sources.insert(
+            AssetSourceId::Default,
+            AssetSource::build().with_reader(move || Box::new(memory_reader.clone())),
+        );
+
+        AssetProcessor::new(&mut sources)
+    }
+
+    #[test]
+    fn get_asset_processor_by_name() {
+        let asset_processor = create_empty_asset_processor();
+        asset_processor.register_processor(MyProcessor::<Marker>(PhantomData));
+
+        let long_processor = asset_processor
+            .get_processor(
+                "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::Marker>",
+            )
+            .expect("Processor was previously registered");
+        let short_processor = asset_processor
+            .get_processor("MyProcessor<Marker>")
+            .expect("Processor was previously registered");
+
+        // We can use either the long or short processor name and we will get the same processor
+        // out.
+        assert!(Arc::ptr_eq(&long_processor, &short_processor));
+    }
+
+    #[test]
+    fn missing_processor_returns_error() {
+        let asset_processor = create_empty_asset_processor();
+
+        let Err(long_processor_err) = asset_processor.get_processor(
+            "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::Marker>",
+        ) else {
+            panic!("Processor was returned even though we never registered any.");
+        };
+        let GetProcessorError::Missing(long_processor_err) = &long_processor_err else {
+            panic!("get_processor returned incorrect error: {long_processor_err}");
+        };
+        assert_eq!(
+            long_processor_err,
+            "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::Marker>"
+        );
+
+        // Short paths should also return an error.
+
+        let Err(long_processor_err) = asset_processor.get_processor("MyProcessor<Marker>") else {
+            panic!("Processor was returned even though we never registered any.");
+        };
+        let GetProcessorError::Missing(long_processor_err) = &long_processor_err else {
+            panic!("get_processor returned incorrect error: {long_processor_err}");
+        };
+        assert_eq!(long_processor_err, "MyProcessor<Marker>");
+    }
+
+    // Create another marker type whose short name will overlap `Marker`.
+    mod sneaky {
+        use bevy_reflect::TypePath;
+
+        #[derive(TypePath)]
+        pub struct Marker;
+    }
+
+    #[test]
+    fn ambiguous_short_path_returns_error() {
+        let asset_processor = create_empty_asset_processor();
+        asset_processor.register_processor(MyProcessor::<Marker>(PhantomData));
+        asset_processor.register_processor(MyProcessor::<sneaky::Marker>(PhantomData));
+
+        let Err(long_processor_err) = asset_processor.get_processor("MyProcessor<Marker>") else {
+            panic!("Processor was returned even though the short path is ambiguous.");
+        };
+        let GetProcessorError::Ambiguous {
+            processor_short_name,
+            ambiguous_processor_names,
+        } = &long_processor_err
+        else {
+            panic!("get_processor returned incorrect error: {long_processor_err}");
+        };
+        assert_eq!(processor_short_name, "MyProcessor<Marker>");
+        let expected_ambiguous_names = [
+            "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::Marker>",
+            "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::sneaky::Marker>",
+        ];
+        assert_eq!(ambiguous_processor_names, &expected_ambiguous_names);
+
+        let processor_1 = asset_processor
+            .get_processor(
+                "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::Marker>",
+            )
+            .expect("Processor was previously registered");
+        let processor_2 = asset_processor
+            .get_processor(
+                "bevy_asset::processor::tests::MyProcessor<bevy_asset::processor::tests::sneaky::Marker>",
+            )
+            .expect("Processor was previously registered");
+
+        // If we fully specify the paths, we get the two different processors.
+        assert!(!Arc::ptr_eq(&processor_1, &processor_2));
+    }
+}