### Question:
BindObjectMetadataToRequest implements Binder { @SuppressWarnings("unchecked") @Override public <R extends HttpRequest> R bindToRequest(R request, Object input) { checkArgument(checkNotNull(input, "input") instanceof ObjectMetadata, "this binder is only valid for ObjectMetadata!"); checkNotNull(request, "request"); ObjectMetadata md = ObjectMetadata.class.cast(input); checkArgument(md.getKey() != null, "objectMetadata.getKey() must be set!"); request = metadataPrefixer.bindToRequest(request, md.getUserMetadata()); Builder<String, String> headers = ImmutableMultimap.builder(); if (md.getContentMetadata().getCacheControl() != null) { headers.put(HttpHeaders.CACHE_CONTROL, md.getContentMetadata().getCacheControl()); } if (md.getContentMetadata().getContentDisposition() != null) { headers.put("Content-Disposition", md.getContentMetadata().getContentDisposition()); } if (md.getContentMetadata().getContentEncoding() != null) { headers.put("Content-Encoding", md.getContentMetadata().getContentEncoding()); } String contentLanguage = md.getContentMetadata().getContentLanguage(); if (contentLanguage != null) { headers.put(HttpHeaders.CONTENT_LANGUAGE, contentLanguage); } if (md.getContentMetadata().getContentType() != null) { headers.put(HttpHeaders.CONTENT_TYPE, md.getContentMetadata().getContentType()); } else { headers.put(HttpHeaders.CONTENT_TYPE, "binary/octet-stream"); } if (md.getContentMetadata().getContentMD5() != null) { headers.put("Content-MD5", base64().encode(md.getContentMetadata().getContentMD5())); } ObjectMetadata.StorageClass storageClass = md.getStorageClass(); if (storageClass != ObjectMetadata.StorageClass.STANDARD) { headers.put("x-amz-storage-class", storageClass.toString()); } return (R) request.toBuilder().replaceHeaders(headers.build()).build(); } @Inject  BindObjectMetadataToRequest(BindMapToHeadersWithPrefix metadataPrefixer); @SuppressWarnings("unchecked") @Override R bindToRequest(R request, Object input);  }### Answer:
@Test public void testPassWithMinimumDetailsAndPayload5GB() { ObjectMetadata md = ObjectMetadataBuilder.create().key("foo").build(); HttpRequest request = HttpRequest.builder().method("POST").endpoint("http: BindObjectMetadataToRequest binder = injector.getInstance(BindObjectMetadataToRequest.class); assertEquals(binder.bindToRequest(request, md), HttpRequest.builder().method("POST") .endpoint("http: }
@Test public void testExtendedPropertiesBind() { ObjectMetadata md = ObjectMetadataBuilder.create().key("foo").cacheControl("no-cache").userMetadata( ImmutableMap.of("foo", "bar")).build(); HttpRequest request = HttpRequest.builder().method("POST").endpoint("http: BindObjectMetadataToRequest binder = injector.getInstance(BindObjectMetadataToRequest.class); assertEquals(binder.bindToRequest(request, md), HttpRequest.builder().method("POST").endpoint("http: ImmutableMultimap.of("Cache-Control", "no-cache", "x-amz-meta-foo", "bar", "Content-Type", "binary/octet-stream")).build()); }
@Test(expectedExceptions = IllegalArgumentException.class) public void testNoKeyIsBad() { ObjectMetadata md = ObjectMetadataBuilder.create().build(); HttpRequest request = HttpRequest.builder().method("POST").endpoint("http: BindObjectMetadataToRequest binder = injector.getInstance(BindObjectMetadataToRequest.class); binder.bindToRequest(request, md); }
@Test(expectedExceptions = IllegalArgumentException.class) public void testMustBeObjectMetadata() { HttpRequest request = HttpRequest.builder().method("POST").endpoint("http: injector.getInstance(BindObjectMetadataToRequest.class).bindToRequest(request, new File("foo")); }
@Test(expectedExceptions = { NullPointerException.class, IllegalStateException.class }) public void testNullIsBad() { BindMapToHeadersWithPrefix binder = new BindMapToHeadersWithPrefix("prefix:"); HttpRequest request = HttpRequest.builder().method("GET").endpoint("http: binder.bindToRequest(request, null); }