Fix S3 unit tests

Author: belugabehr

services/s3/src/test/java/software/amazon/awssdk/services/s3/internal/resource/S3ArnConverterTest.java

@@ -443,15 +443,15 @@ public void parseArn_objectLambda_colon() {
     @Test
     public void parseArn_objectLambda_noName_slash() {
         exception.expect(IllegalArgumentException.class);
-        exception.expectMessage("resource must not be blank or empty");
+        exception.expectMessage("Malformed ARN: arn:aws:s3-object-lambda:us-west-2:123456789012:accesspoint/");
 
         S3_ARN_PARSER.convertArn(Arn.fromString("arn:aws:s3-object-lambda:us-west-2:123456789012:accesspoint/"));
     }
 
     @Test
     public void parseArn_objectLambda_noName_colon() {
         exception.expect(IllegalArgumentException.class);
-        exception.expectMessage("resource must not be blank or empty");
+        exception.expectMessage("Malformed ARN: arn:aws:s3-object-lambda:us-west-2:123456789012:accesspoint:");
 
         S3_ARN_PARSER.convertArn(Arn.fromString("arn:aws:s3-object-lambda:us-west-2:123456789012:accesspoint:"));
     }