diff --git a/test/expected/cast.out b/test/expected/cast.out
index f8e18dd..6432af4 100644
--- a/test/expected/cast.out
+++ b/test/expected/cast.out
@@ -96,6 +96,24 @@ SELECT '[1,2,3]'::halfvec::vector(3);
 
 SELECT '[1,2,3]'::halfvec::vector(2);
 ERROR:  expected 2 dimensions, not 3
+SELECT '{1,2,3}'::real[]::halfvec;
+ halfvec 
+---------
+ [1,2,3]
+(1 row)
+
+SELECT '{1,2,3}'::real[]::halfvec(3);
+ halfvec 
+---------
+ [1,2,3]
+(1 row)
+
+SELECT '{1,2,3}'::real[]::halfvec(2);
+ERROR:  expected 2 dimensions, not 3
+SELECT '{65520,-65520}'::real[]::halfvec;
+ERROR:  value out of range: overflow
+SELECT '{1e-8,-1e-8}'::real[]::halfvec;
+ERROR:  value out of range: underflow
 SELECT '[0,1.5,0,3.5,0]'::vector::sparsevec;
     sparsevec    
 -----------------
diff --git a/test/sql/cast.sql b/test/sql/cast.sql
index 6adbe6f..4d9691c 100644
--- a/test/sql/cast.sql
+++ b/test/sql/cast.sql
@@ -26,6 +26,12 @@ SELECT '[1,2,3]'::halfvec::vector;
 SELECT '[1,2,3]'::halfvec::vector(3);
 SELECT '[1,2,3]'::halfvec::vector(2);
 
+SELECT '{1,2,3}'::real[]::halfvec;
+SELECT '{1,2,3}'::real[]::halfvec(3);
+SELECT '{1,2,3}'::real[]::halfvec(2);
+SELECT '{65520,-65520}'::real[]::halfvec;
+SELECT '{1e-8,-1e-8}'::real[]::halfvec;
+
 SELECT '[0,1.5,0,3.5,0]'::vector::sparsevec;
 SELECT '[0,1.5,0,3.5,0]'::vector::sparsevec(5);
 SELECT '[0,1.5,0,3.5,0]'::vector::sparsevec(4);