diff --git a/src/main/java/com/google/devtools/build/lib/remote/ByteStreamUploader.java b/src/main/java/com/google/devtools/build/lib/remote/ByteStreamUploader.java
index aea5383cb2a6e3..c7602543032709 100644
--- a/src/main/java/com/google/devtools/build/lib/remote/ByteStreamUploader.java
+++ b/src/main/java/com/google/devtools/build/lib/remote/ByteStreamUploader.java
@@ -16,8 +16,6 @@
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
 import static com.google.devtools.build.lib.remote.util.DigestUtil.isOldStyleDigestFunction;
-import static com.google.devtools.build.lib.remote.util.Utils.getFromFuture;
-import static com.google.devtools.build.lib.remote.util.Utils.waitForBulkTransfer;
 import static java.lang.String.format;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
@@ -50,9 +48,6 @@
 import io.grpc.stub.ClientResponseObserver;
 import io.netty.util.ReferenceCounted;
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
 import java.util.UUID;
 import java.util.concurrent.Semaphore;
 import javax.annotation.Nullable;
@@ -104,54 +99,6 @@ final class ByteStreamUploader {
     this.digestFunction = digestFunction;
   }
 
-  @VisibleForTesting
-  ReferenceCountedChannel getChannel() {
-    return channel;
-  }
-
-  @VisibleForTesting
-  RemoteRetrier getRetrier() {
-    return retrier;
-  }
-
-  /**
-   * Uploads a BLOB, as provided by the {@link Chunker}, to the remote {@code ByteStream} service.
-   * The call blocks until the upload is complete, or throws an {@link Exception} in case of error.
-   *
-   * <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
-   * transparent to the user of this API.
-   *
-   * @param digest the digest of the data to upload.
-   * @param chunker the data to upload.
-   * @throws IOException when reading of the {@link Chunker}s input source fails
-   */
-  public void uploadBlob(RemoteActionExecutionContext context, Digest digest, Chunker chunker)
-      throws IOException, InterruptedException {
-    getFromFuture(uploadBlobAsync(context, digest, chunker));
-  }
-
-  /**
-   * Uploads a list of BLOBs concurrently to the remote {@code ByteStream} service. The call blocks
-   * until the upload of all BLOBs is complete, or throws an {@link
-   * com.google.devtools.build.lib.remote.common.BulkTransferException} if there are errors.
-   *
-   * <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
-   * transparent to the user of this API.
-   *
-   * @param chunkers the data to upload.
-   * @throws IOException when reading of the {@link Chunker}s input source or uploading fails
-   */
-  public void uploadBlobs(RemoteActionExecutionContext context, Map<Digest, Chunker> chunkers)
-      throws IOException, InterruptedException {
-    List<ListenableFuture<Void>> uploads = new ArrayList<>();
-
-    for (Map.Entry<Digest, Chunker> chunkerEntry : chunkers.entrySet()) {
-      uploads.add(uploadBlobAsync(context, chunkerEntry.getKey(), chunkerEntry.getValue()));
-    }
-
-    waitForBulkTransfer(uploads, /* cancelRemainingOnInterrupt= */ true);
-  }
-
   /**
    * Uploads a BLOB asynchronously to the remote {@code ByteStream} service. The call returns
    * immediately and one can listen to the returned future for the success/failure of the upload.
diff --git a/src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java b/src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java
index d0f95accb257ba..0986a00ce2ec19 100644
--- a/src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java
+++ b/src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java
@@ -15,6 +15,8 @@
 
 import static com.google.common.base.Preconditions.checkState;
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.devtools.build.lib.remote.util.Utils.getFromFuture;
+import static com.google.devtools.build.lib.remote.util.Utils.waitForBulkTransfer;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.fail;
@@ -180,7 +182,7 @@ public void singleBlobUploadShouldWork() throws Exception {
 
     serviceRegistry.addService(TestUtils.newNoErrorByteStreamService(blob));
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should not have triggered any retries.
     Mockito.verifyNoInteractions(mockBackoff);
@@ -243,7 +245,7 @@ public void onCompleted() {}
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should not have triggered any retries.
     Mockito.verifyNoInteractions(mockBackoff);
@@ -358,7 +360,7 @@ public void queryWriteStatus(
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test triggers one retry.
     Mockito.verify(mockBackoff, Mockito.times(1))
@@ -474,7 +476,7 @@ public void queryWriteStatus(
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
     byte[] decompressed = Zstd.decompress(output.toByteArray(), blob.length - skipSize);
     assertThat(Arrays.equals(decompressed, 0, decompressed.length, blob, skipSize, blob.length))
         .isTrue();
@@ -541,7 +543,7 @@ public void queryWriteStatus(
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
   }
 
   @Test
@@ -598,7 +600,7 @@ public void queryWriteStatus(
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should not have triggered any retries.
     assertThat(numWriteCalls.get()).isEqualTo(1);
@@ -669,7 +671,7 @@ public void queryWriteStatus(
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should have triggered a single retry, because it made
     // no progress.
@@ -708,7 +710,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> streamOb
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should not have triggered any retries.
     Mockito.verifyNoInteractions(mockBackoff);
@@ -759,7 +761,7 @@ public void onCompleted() {
         });
 
     try {
-      uploader.uploadBlob(context, digest, chunker);
+      uploadBlob(uploader, context, digest, chunker);
       fail("Should have thrown an exception.");
     } catch (IOException e) {
       // expected
@@ -798,7 +800,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> streamOb
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
   }
 
   @Test
@@ -831,7 +833,7 @@ public void multipleBlobsUploadShouldWork() throws Exception {
 
     serviceRegistry.addService(new MaybeFailOnceUploadService(blobsByHash));
 
-    uploader.uploadBlobs(context, chunkers);
+    uploadBlobs(uploader, context, chunkers);
   }
 
   @Test
@@ -859,7 +861,8 @@ public void tooManyFilesIOException_adviseMaximumOpenFilesFlag() throws Exceptio
             + " --bep_maximum_open_remote_upload_files flag to a number lower than your system"
             + " default (run 'ulimit -a' for *nix-based operating systems). Original error message:"
             + " Too many open files";
-    assertThat(assertThrows(IOException.class, () -> uploader.uploadBlob(context, digest, chunker)))
+    assertThat(
+            assertThrows(IOException.class, () -> uploadBlob(uploader, context, digest, chunker)))
         .hasMessageThat()
         .isEqualTo(newMessage);
   }
@@ -901,7 +904,7 @@ public void availablePermitsOpenFileSemaphore_fewerPermitsThanUploads_endWithAll
 
     serviceRegistry.addService(new MaybeFailOnceUploadService(blobsByHash));
 
-    uploader.uploadBlobs(context, chunkers);
+    uploadBlobs(uploader, context, chunkers);
 
     assertThat(uploader.getOpenedFilePermits().availablePermits()).isEqualTo(maximumOpenFiles);
   }
@@ -937,7 +940,7 @@ public void noMaximumOpenFilesFlags_nullSemaphore() throws Exception {
 
     serviceRegistry.addService(new MaybeFailOnceUploadService(blobsByHash));
 
-    uploader.uploadBlobs(context, chunkers);
+    uploadBlobs(uploader, context, chunkers);
     assertThat(uploader.getOpenedFilePermits()).isNull();
   }
 
@@ -1134,7 +1137,7 @@ public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
               }
             }));
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
   }
 
   @Test
@@ -1165,7 +1168,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> response
         });
 
     try {
-      uploader.uploadBlob(context, digest, chunker);
+      uploadBlob(uploader, context, digest, chunker);
       fail("Should have thrown an exception.");
     } catch (IOException e) {
       assertThat(RemoteRetrierUtils.causedByStatus(e, Code.INTERNAL)).isTrue();
@@ -1207,7 +1210,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> response
     Chunker chunker = Chunker.builder().setInput(blob).setChunkSize(CHUNK_SIZE).build();
     Digest digest = DIGEST_UTIL.compute(blob);
     try {
-      uploader.uploadBlob(context, digest, chunker);
+      uploadBlob(uploader, context, digest, chunker);
       fail("Should have thrown an exception.");
     } catch (IOException e) {
       assertThat(e).hasCauseThat().isInstanceOf(RejectedExecutionException.class);
@@ -1255,7 +1258,7 @@ public void onCompleted() {
     Chunker chunker = Chunker.builder().setInput(blob).setChunkSize(CHUNK_SIZE).build();
     Digest digest = DIGEST_UTIL.compute(blob);
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
   }
 
   @Test
@@ -1299,7 +1302,7 @@ public void onCompleted() {
     Chunker chunker = Chunker.builder().setInput(blob).setChunkSize(CHUNK_SIZE).build();
     Digest digest = DIGEST_UTIL.compute(blob);
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
   }
 
   @Test
@@ -1334,7 +1337,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> response
     Digest digest = DIGEST_UTIL.compute(blob);
 
     try {
-      uploader.uploadBlob(context, digest, chunker);
+      uploadBlob(uploader, context, digest, chunker);
       fail("Should have thrown an exception.");
     } catch (IOException e) {
       assertThat(numCalls.get()).isEqualTo(1);
@@ -1389,7 +1392,7 @@ public StreamObserver<WriteRequest> write(StreamObserver<WriteResponse> streamOb
           }
         });
 
-    assertThrows(IOException.class, () -> uploader.uploadBlob(context, digest, chunker));
+    assertThrows(IOException.class, () -> uploadBlob(uploader, context, digest, chunker));
 
     assertThat(refreshTimes.get()).isEqualTo(1);
     assertThat(numUploads.get()).isEqualTo(2);
@@ -1474,7 +1477,7 @@ public void onCompleted() {
           }
         });
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     assertThat(refreshTimes.get()).isEqualTo(1);
     assertThat(numUploads.get()).isEqualTo(2);
@@ -1540,7 +1543,7 @@ public void queryWriteStatus(
     Chunker chunker = Chunker.builder().setInput(blob).setChunkSize(CHUNK_SIZE).build();
     Digest digest = DIGEST_UTIL.compute(blob);
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     assertThat(numUploads.get()).isEqualTo(1);
   }
@@ -1630,7 +1633,7 @@ public void onCompleted() {
         Chunker.builder().setInput(blob).setCompressed(true).setChunkSize(CHUNK_SIZE).build();
     Digest digest = DIGEST_UTIL.compute(blob);
 
-    uploader.uploadBlob(context, digest, chunker);
+    uploadBlob(uploader, context, digest, chunker);
 
     // This test should not have triggered any retries.
     Mockito.verifyNoInteractions(mockBackoff);
@@ -1638,6 +1641,53 @@ public void onCompleted() {
     assertThat(numUploads.get()).isEqualTo(1);
   }
 
+  /**
+   * Uploads a BLOB, as provided by the {@link Chunker}, to the remote {@code ByteStream} service.
+   * The call blocks until the upload is complete, or throws an {@link Exception} in case of error.
+   *
+   * <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
+   * transparent to the user of this API.
+   *
+   * @param digest the digest of the data to upload.
+   * @param chunker the data to upload.
+   * @throws IOException when reading of the {@link Chunker}s input source fails
+   */
+  private static void uploadBlob(
+      ByteStreamUploader byteStreamUploader,
+      RemoteActionExecutionContext context,
+      Digest digest,
+      Chunker chunker)
+      throws IOException, InterruptedException {
+    getFromFuture(byteStreamUploader.uploadBlobAsync(context, digest, chunker));
+  }
+
+  /**
+   * Uploads a list of BLOBs concurrently to the remote {@code ByteStream} service. The call blocks
+   * until the upload of all BLOBs is complete, or throws an {@link
+   * com.google.devtools.build.lib.remote.common.BulkTransferException} if there are errors.
+   *
+   * <p>Uploads are retried according to the specified {@link RemoteRetrier}. Retrying is
+   * transparent to the user of this API.
+   *
+   * @param chunkers the data to upload.
+   * @throws IOException when reading of the {@link Chunker}s input source or uploading fails
+   */
+  private static void uploadBlobs(
+      ByteStreamUploader byteStreamUploader,
+      RemoteActionExecutionContext context,
+      Map<Digest, Chunker> chunkers)
+      throws IOException, InterruptedException {
+    List<ListenableFuture<Void>> uploads = new ArrayList<>();
+
+    for (Map.Entry<Digest, Chunker> chunkerEntry : chunkers.entrySet()) {
+      uploads.add(
+          byteStreamUploader.uploadBlobAsync(
+              context, chunkerEntry.getKey(), chunkerEntry.getValue()));
+    }
+
+    waitForBulkTransfer(uploads, /* cancelRemainingOnInterrupt= */ true);
+  }
+
   private static class NoopStreamObserver implements StreamObserver<WriteRequest> {
     @Override
     public void onNext(WriteRequest writeRequest) {}