nastra commented on code in PR #13118:
URL: https://github.com/apache/iceberg/pull/13118#discussion_r2101817664


##########
aws/src/integration/java/org/apache/iceberg/aws/s3/TestS3FileIO.java:
##########
@@ -719,6 +723,84 @@ public void multipleStorageCredentialsConfigured() {
         .hasMessage("Invalid S3 Credentials: only one S3 credential should 
exist");
   }
 
+  @Test
+  public void initFileIOWithoutCredentials() {
+    S3FileIO fileIO = new S3FileIO();
+    fileIO.initialize(ImmutableMap.of("client.region", "us-east-1"));
+
+    S3ServiceClientConfiguration actualConfiguration = 
fileIO.client().serviceClientConfiguration();
+    assertThat(actualConfiguration).isNotNull();
+    try {
+      actualConfiguration.credentialsProvider().resolveIdentity();
+    } catch (SdkClientException e) {

Review Comment:
   please use `assertThatThrownBy(..).isInstanceOf(..).hasMessage(..)` instead 
of a try-catch block



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