diff --git a/src/main/scala/net/kemitix/s3thorp/awssdk/CatsIOS3Client.scala b/src/main/scala/net/kemitix/s3thorp/awssdk/CatsIOS3Client.scala
index 953401a..46ca247 100644
--- a/src/main/scala/net/kemitix/s3thorp/awssdk/CatsIOS3Client.scala
+++ b/src/main/scala/net/kemitix/s3thorp/awssdk/CatsIOS3Client.scala
@@ -1,12 +1,9 @@
 package net.kemitix.s3thorp.awssdk
 
-import com.github.j5ik2o.reactive.aws.s3.S3AsyncClient
 import com.github.j5ik2o.reactive.aws.s3.cats.S3CatsIOClient
-import software.amazon.awssdk.services.s3.{S3AsyncClient => JavaS3AsyncClient}
 
-trait CatsIOS3Client {
-
-  def s3Client = S3CatsIOClient(S3AsyncClient(JavaS3AsyncClient.create))
+trait CatsIOS3Client extends S3CatsIOClientProvider {
 
+  def s3Client = S3CatsIOClient(underlying)
 
 }
diff --git a/src/main/scala/net/kemitix/s3thorp/awssdk/ReactiveS3Client.scala b/src/main/scala/net/kemitix/s3thorp/awssdk/ReactiveS3Client.scala
index 6c4be9d..e98d6f4 100644
--- a/src/main/scala/net/kemitix/s3thorp/awssdk/ReactiveS3Client.scala
+++ b/src/main/scala/net/kemitix/s3thorp/awssdk/ReactiveS3Client.scala
@@ -22,6 +22,7 @@ private class ReactiveS3Client
         _ <- putStrLn(s"  -- ${response.eTag()} : ${response.lastModified()}")
       } yield Some((response.eTag(), response.lastModified()))
     } catch {
+      //FIXME: this isn't catching the exception
       case _: NoSuchKeyException => IO(None)
     }
   }
diff --git a/src/main/scala/net/kemitix/s3thorp/awssdk/S3CatsIOClientProvider.scala b/src/main/scala/net/kemitix/s3thorp/awssdk/S3CatsIOClientProvider.scala
new file mode 100644
index 0000000..dd73dc1
--- /dev/null
+++ b/src/main/scala/net/kemitix/s3thorp/awssdk/S3CatsIOClientProvider.scala
@@ -0,0 +1,9 @@
+package net.kemitix.s3thorp.awssdk
+
+import com.github.j5ik2o.reactive.aws.s3.cats.S3CatsIOClient
+
+trait S3CatsIOClientProvider extends UnderlyingS3AsyncClient {
+
+  def s3Client: S3CatsIOClient
+
+}
diff --git a/src/main/scala/net/kemitix/s3thorp/awssdk/UnderlyingS3AsyncClient.scala b/src/main/scala/net/kemitix/s3thorp/awssdk/UnderlyingS3AsyncClient.scala
new file mode 100644
index 0000000..cb67314
--- /dev/null
+++ b/src/main/scala/net/kemitix/s3thorp/awssdk/UnderlyingS3AsyncClient.scala
@@ -0,0 +1,11 @@
+package net.kemitix.s3thorp.awssdk
+
+import com.github.j5ik2o.reactive.aws.s3.S3AsyncClient
+import com.github.j5ik2o.reactive.aws.s3.cats.S3CatsIOClient
+import software.amazon.awssdk.services.s3.{S3AsyncClient => JavaS3AsyncClient}
+
+trait UnderlyingS3AsyncClient extends S3CatsIOClient{
+
+  override val underlying: S3AsyncClient = S3AsyncClient(JavaS3AsyncClient.create)
+
+}
diff --git a/src/test/scala/net/kemitix/s3thorp/awssdk/ReactiveS3ClientTest.scala b/src/test/scala/net/kemitix/s3thorp/awssdk/ReactiveS3ClientTest.scala
new file mode 100644
index 0000000..c470b9d
--- /dev/null
+++ b/src/test/scala/net/kemitix/s3thorp/awssdk/ReactiveS3ClientTest.scala
@@ -0,0 +1,45 @@
+package net.kemitix.s3thorp.awssdk
+
+import java.time.Instant
+
+import cats.effect.IO
+import com.github.j5ik2o.reactive.aws.s3.cats.S3CatsIOClient
+import org.scalatest.FunSpec
+import software.amazon.awssdk.services.s3.model.{HeadObjectRequest, HeadObjectResponse}
+
+class ReactiveS3ClientTest extends FunSpec {
+
+  describe("testObjectHead") {
+    def invoke(self: S3Client) = {
+      self.objectHead("bucket", "remoteKey").unsafeRunSync()
+    }
+
+    describe("when response is okay") {
+      val expectedHash = "hash"
+      val expectedLastModified = Instant.now
+      new ReactiveS3Client { self: S3Client => {
+          it("should return Some(expected values)") {
+            val result: Option[(String, Instant)] = invoke(self)
+            assertResult(Some((expectedHash, expectedLastModified)))(result)
+          }
+        }
+        override def s3Client: S3CatsIOClient = new S3CatsIOClient with UnderlyingS3AsyncClient {
+          override def headObject(headObjectRequest: HeadObjectRequest): IO[HeadObjectResponse] =
+            IO(HeadObjectResponse.builder().
+              eTag(expectedHash).
+              lastModified(expectedLastModified).
+              build())
+        }
+      }
+
+    }
+//    describe("when throws NoSuchKeyException") {
+//      new ReactiveS3Client with S3CatsIOClientProvider { self =>
+//        it("should return None") {
+//          assertResult(None)(result)
+//        }
+//      }
+//    }
+  }
+
+}