[TEST] getObjectMetadata should also refine FileNotFoundException

While working on a use-case in which we first check for object existence via
`getObjectMetadata` before we use `putObject` in order to save bandwidth, I
realized that when using the test stub the tests were failing with an
`NoSuchFileException`.

This was due to the fact that `getObjectMetadata` does not refine the
`NoSuchFileException` like `getObject` does with `FileNotFoundException`.

This commit adds refinement of these exceptions to `getObjectMetadata`
analogous to `getObject`. The `fileNotFound` function needs to be adapted
to `Throwable` because `java.nio.*` and `java.io.*` do not share an error
hierarchy.

zio-s3/src/main/scala/zio/s3/Test.scala

@@ -16,8 +16,8 @@
 
 package zio.s3
 
-import java.io.FileInputStream
-import java.nio.file.StandardOpenOption
+import java.io.{ FileInputStream, FileNotFoundException }
+import java.nio.file.{ NoSuchFileException, StandardOpenOption }
 import java.nio.file.attribute.BasicFileAttributes
 import java.util.UUID
 import java.util.concurrent.CompletableFuture
@@ -30,14 +30,12 @@ import zio.nio.file.Files
 import zio.s3.S3Bucket._
 import zio.stream.{ Stream, ZStream }
 
-import java.io.FileNotFoundException
-
 /**
  * Stub Service which is back by a filesystem storage
  */
 object Test {
 
-  private def fileNotFound(err: FileNotFoundException): S3Exception =
+  private def fileNotFound(err: Throwable): S3Exception =
     S3Exception
       .builder()
       .message("Key does not exist.")
@@ -91,7 +89,10 @@ object Test {
             file                   <- Files
                                         .readAttributes[BasicFileAttributes](path / bucketName / key)
                                         .map(p => ObjectMetadata(metadata, contentType, p.size()))
-          } yield file).orDie
+          } yield file)
+            .refineOrDie {
+              case e: NoSuchFileException => fileNotFound(e)
+            }
 
         override def listObjects(
           bucketName: String,

zio-s3/src/test/scala/zio/s3/S3Test.scala

@@ -191,6 +191,13 @@ object S3Suite {
                        .fold(ex => ex.statusCode() == 404, _ => false)
         } yield assertTrue(succeed)
       },
+      test("get object metadata - invalid identifier") {
+        for {
+          succeed <- getObjectMetadata(bucketName, UUID.randomUUID().toString)
+                       .refineToOrDie[S3Exception]
+                       .fold(ex => ex.statusCode() == 404, _ => false)
+        } yield assertTrue(succeed)
+      },
       test("get nextObjects") {
         for {
           token   <- listObjects(bucketName, ListObjectOptions.fromMaxKeys(1)).map(_.nextContinuationToken)