fix: #39 Adds a garbage collected deep copy test

Signed-off-by: Ava Affine <ava@sunnypup.io>

hyphae/src/heap.rs

@@ -127,7 +127,7 @@ impl<T: Clone> Gc<T> {
     pub fn deep_copy(&self) -> Gc<T> {
         Gc(unsafe {
             NonNull::new(Box::into_raw(Box::new(Rc::from(
-                            (*(self.0.as_ptr())).clone()))))
+                            self.0.as_ref().clone()))))
                 .expect("GC obj deep copy nonnull ptr check")
         })
     }
@@ -292,9 +292,9 @@ impl Index<usize> for Cons {
 mod tests {
     use super::*;
 
-    struct GcTester<'a>(&'a mut bool);
+    #[derive(Debug)]
+    struct GcTester<'a>(pub &'a mut bool);
 
-    // clone implementation leaks memory... but its for test
     impl Clone for GcTester<'_> {
         fn clone(&self) -> Self {
             unsafe {
@@ -309,13 +309,22 @@ mod tests {
         }
     }
 
-    // in non test code Id have to get the box back
     impl Drop for GcTester<'_> {
         fn drop(&mut self) {
             *self.0 = true;
         }
     }
 
+    impl PartialEq for GcTester<'_> {
+        fn eq(&self, other: &Self) -> bool {
+            *(self.0) == *(other.0)
+        }
+
+        fn ne(&self, other: &Self) -> bool {
+            *(self.0) != *(other.0)
+        }
+    }
+
     #[test]
     fn test_gc_basic_behavior() {
         let mut flag = false;
@@ -333,5 +342,15 @@ mod tests {
         assert!(flag)
     }
 
-    // TODO: test deep copy
+    #[test]
+    fn test_gc_deep_copy() {
+        let mut flag = false;
+        let reference_holder =
+            Into::<Gc<GcTester>>::into(GcTester(&mut flag)).clone();
+        let copied_data = reference_holder.deep_copy();
+
+        assert_eq!(*reference_holder, *copied_data);
+        drop(reference_holder);
+        assert!(!*(*copied_data).0);
+    }
 }