diff --git a/scio-parquet/src/test/scala/com/spotify/scio/parquet/avro/ParquetAvroIOTest.scala b/scio-parquet/src/test/scala/com/spotify/scio/parquet/avro/ParquetAvroIOTest.scala
index 8c3a2b3da5..35ea93753d 100644
--- a/scio-parquet/src/test/scala/com/spotify/scio/parquet/avro/ParquetAvroIOTest.scala
+++ b/scio-parquet/src/test/scala/com/spotify/scio/parquet/avro/ParquetAvroIOTest.scala
@@ -57,7 +57,7 @@ class ParquetAvroIOFileNamePolicyTest extends FileNamePolicySpec[TestRecord] {
   override def failSaves = Seq(
     _.map(AvroUtils.newSpecificRecord).saveAsParquetAvroFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
diff --git a/scio-parquet/src/test/scala/com/spotify/scio/parquet/tensorflow/ParquetExampleIOTest.scala b/scio-parquet/src/test/scala/com/spotify/scio/parquet/tensorflow/ParquetExampleIOTest.scala
index 81ba2aff9b..12a4d3c11f 100644
--- a/scio-parquet/src/test/scala/com/spotify/scio/parquet/tensorflow/ParquetExampleIOTest.scala
+++ b/scio-parquet/src/test/scala/com/spotify/scio/parquet/tensorflow/ParquetExampleIOTest.scala
@@ -110,7 +110,7 @@ class ParquetExampleIOFileNamePolicyTest extends FileNamePolicySpec[Example] {
     _.map(newExample).saveAsParquetExampleFile(
       "nonsense",
       schema,
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
diff --git a/scio-parquet/src/test/scala/com/spotify/scio/parquet/types/ParquetTypeIOTest.scala b/scio-parquet/src/test/scala/com/spotify/scio/parquet/types/ParquetTypeIOTest.scala
index 6d5cc67cb4..8f2cc1bea5 100644
--- a/scio-parquet/src/test/scala/com/spotify/scio/parquet/types/ParquetTypeIOTest.scala
+++ b/scio-parquet/src/test/scala/com/spotify/scio/parquet/types/ParquetTypeIOTest.scala
@@ -44,7 +44,7 @@ class ParquetTypeIOFileNamePolicyTest extends FileNamePolicySpec[Wide] {
   override def failSaves: Seq[SCollection[Int] => ClosedTap[Wide]] = Seq(
     _.map(i => Wide(i, i.toString, Some(i), (1 to i).toList)).saveAsTypedParquetFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
diff --git a/scio-tensorflow/src/test/scala/com/spotify/scio/tensorflow/TFExampleIOTest.scala b/scio-tensorflow/src/test/scala/com/spotify/scio/tensorflow/TFExampleIOTest.scala
index 77733a3ea3..2ec199cbb2 100644
--- a/scio-tensorflow/src/test/scala/com/spotify/scio/tensorflow/TFExampleIOTest.scala
+++ b/scio-tensorflow/src/test/scala/com/spotify/scio/tensorflow/TFExampleIOTest.scala
@@ -63,7 +63,7 @@ class TFExampleIOFileNamePolicyTest extends FileNamePolicySpec[Example] {
   override def failSaves = Seq(
     _.map(x => recordT(Record(x, x.toString))).saveAsTfRecordFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
diff --git a/scio-test/src/test/scala/com/spotify/scio/io/ScioIOTest.scala b/scio-test/src/test/scala/com/spotify/scio/io/ScioIOTest.scala
index 3c3b337642..1bb97c39b4 100644
--- a/scio-test/src/test/scala/com/spotify/scio/io/ScioIOTest.scala
+++ b/scio-test/src/test/scala/com/spotify/scio/io/ScioIOTest.scala
@@ -169,7 +169,7 @@ class AvroIOFileNamePolicyTest extends FileNamePolicySpec[TestRecord] {
   override def failSaves: Seq[SCollection[Int] => ClosedTap[TestRecord]] = Seq(
     _.map(AvroUtils.newSpecificRecord).saveAsAvroFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
@@ -192,7 +192,7 @@ class TextIOFileNamePolicyTest extends FileNamePolicySpec[String] {
   override def failSaves: Seq[SCollection[Int] => ClosedTap[String]] = Seq(
     _.map(_.toString).saveAsTextFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
@@ -217,7 +217,7 @@ class ObjectIOFileNamePolicyTest extends FileNamePolicySpec[ScioIOTest.AvroRecor
   override def failSaves: Seq[SCollection[Int] => ClosedTap[AvroRecord]] = Seq(
     _.map(x => AvroRecord(x, x.toString, (1 to x).map(_.toString).toList)).saveAsObjectFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
@@ -240,7 +240,7 @@ class ProtobufIOFileNamePolicyTest extends FileNamePolicySpec[TrackPB] {
   override def failSaves: Seq[SCollection[Int] => ClosedTap[TrackPB]] = Seq(
     _.map(x => TrackPB.newBuilder().setTrackId(x.toString).build()).saveAsProtobufFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     )
   )
@@ -263,7 +263,7 @@ class BinaryIOFileNamePolicyTest extends FileNamePolicySpec[Nothing] {
   override def failSaves: Seq[SCollection[Int] => ClosedTap[Nothing]] = Seq(
     _.map(x => ByteBuffer.allocate(4).putInt(x).array).saveAsBinaryFile(
       "nonsense",
-      shardNameTemplate = "NNN-of-NNN",
+      shardNameTemplate = "SSS-of-NNN",
       filenamePolicySupplier = testFilenamePolicySupplier
     ),
     _.map(x => ByteBuffer.allocate(4).putInt(x).array).saveAsBinaryFile(