test: split up cast unit tests into their respective modules

1 files changed, 49 insertions, 0 deletions

diff --git a/src/libs/intertrait/cast/box.rs b/src/libs/intertrait/cast/box.rs
index 67fd949..0e160f4 100644
--- a/src/libs/intertrait/cast/box.rs
+++ b/src/libs/intertrait/cast/box.rs
@@ -40,3 +40,52 @@ impl<CastFromSelf: ?Sized + CastFrom> CastBox for CastFromSelf
         })
     }
 }
+
+#[cfg(test)]
+mod tests
+{
+    use std::any::Any;
+    use std::fmt::{Debug, Display};
+
+    use super::*;
+    use crate::test_utils::subjects;
+
+    #[test]
+    fn can_cast_box()
+    {
+        let concrete_ninja = Box::new(subjects::Ninja);
+
+        let abstract_ninja: Box<dyn subjects::INinja> = concrete_ninja;
+
+        let debug_ninja_result = abstract_ninja.cast::<dyn Debug>();
+
+        assert!(debug_ninja_result.is_ok());
+    }
+
+    #[test]
+    fn cannot_cast_box_wrong()
+    {
+        let concrete_ninja = Box::new(subjects::Ninja);
+
+        let abstract_ninja: Box<dyn subjects::INinja> = concrete_ninja;
+
+        let display_ninja_result = abstract_ninja.cast::<dyn Display>();
+
+        assert!(matches!(
+            display_ninja_result,
+            Err(CastError::GetCasterFailed(_))
+        ));
+    }
+
+    #[test]
+    fn can_cast_box_from_any()
+    {
+        let concrete_ninja = Box::new(subjects::Ninja);
+
+        let any_ninja: Box<dyn Any> = concrete_ninja;
+
+        let debug_ninja_result = any_ninja.cast::<dyn Debug>();
+
+        assert!(debug_ninja_result.is_ok());
+    }
+}