diff --git a/services/commtest/src/backup/add_attachments.rs b/services/commtest/src/backup/add_attachments.rs
--- a/services/commtest/src/backup/add_attachments.rs
+++ b/services/commtest/src/backup/add_attachments.rs
@@ -1,7 +1,8 @@
 use crate::backup::backup_utils::{
   proto::AddAttachmentsRequest, BackupData, BackupServiceClient,
 };
-use crate::tools::{Error, ATTACHMENT_DELIMITER};
+use crate::constants::ATTACHMENT_DELIMITER;
+use crate::tools::Error;
 use tonic::Request;
 
 // log_index = None means that we add attachments to the backup
diff --git a/services/commtest/src/backup/pull_backup.rs b/services/commtest/src/backup/pull_backup.rs
--- a/services/commtest/src/backup/pull_backup.rs
+++ b/services/commtest/src/backup/pull_backup.rs
@@ -3,7 +3,8 @@
   proto::pull_backup_response::Id, proto::pull_backup_response::Id::*,
   proto::PullBackupRequest, BackupData, BackupServiceClient, Item,
 };
-use crate::tools::{Error, ATTACHMENT_DELIMITER};
+use crate::constants::ATTACHMENT_DELIMITER;
+use crate::tools::Error;
 use std::io::{Error as IOError, ErrorKind};
 use tonic::Request;
 
diff --git a/services/commtest/src/constants.rs b/services/commtest/src/constants.rs
new file mode 100644
--- /dev/null
+++ b/services/commtest/src/constants.rs
@@ -0,0 +1,13 @@
+use bytesize::ByteSize;
+use lazy_static::lazy_static;
+
+pub const ATTACHMENT_DELIMITER: &str = ";";
+
+pub const GRPC_METADATA_SIZE_BYTES: usize = 5;
+
+lazy_static! {
+  pub static ref DYNAMO_DB_ITEM_SIZE_LIMIT: usize =
+    ByteSize::kib(400).as_u64() as usize;
+  pub static ref GRPC_CHUNK_SIZE_LIMIT: usize =
+    (ByteSize::mib(4).as_u64() as usize) - GRPC_METADATA_SIZE_BYTES;
+}
diff --git a/services/commtest/src/lib.rs b/services/commtest/src/lib.rs
--- a/services/commtest/src/lib.rs
+++ b/services/commtest/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod backup;
 pub mod blob;
+pub mod constants;
 pub mod tools;
diff --git a/services/commtest/src/tools.rs b/services/commtest/src/tools.rs
--- a/services/commtest/src/tools.rs
+++ b/services/commtest/src/tools.rs
@@ -1,6 +1,4 @@
-use bytesize::ByteSize;
 use hex::ToHex;
-use lazy_static::lazy_static;
 use num_cpus;
 use sha2::{Digest, Sha512};
 use std::env;
@@ -25,17 +23,6 @@
   TonicStatus(tonic::Status),
 }
 
-pub const GRPC_METADATA_SIZE_BYTES: usize = 5;
-
-lazy_static! {
-  pub static ref DYNAMO_DB_ITEM_SIZE_LIMIT: usize =
-    ByteSize::kib(400).as_u64() as usize;
-  pub static ref GRPC_CHUNK_SIZE_LIMIT: usize =
-    (ByteSize::mib(4).as_u64() as usize) - GRPC_METADATA_SIZE_BYTES;
-}
-
-pub const ATTACHMENT_DELIMITER: &str = ";";
-
 pub fn obtain_number_of_threads() -> usize {
   let number_of_threads_str: String =
     env::var("COMM_NUMBER_OF_THREADS").unwrap();
diff --git a/services/commtest/tests/backup_integration_test.rs b/services/commtest/tests/backup_integration_test.rs
--- a/services/commtest/tests/backup_integration_test.rs
+++ b/services/commtest/tests/backup_integration_test.rs
@@ -4,7 +4,8 @@
   backup_utils::{self, BackupData, BackupServiceClient, Item},
   create_new_backup, pull_backup, send_log,
 };
-use commtest::tools::{self, Error};
+use commtest::constants;
+use commtest::tools::Error;
 use std::collections::HashMap;
 use std::env;
 
@@ -36,7 +37,7 @@
       Item::new(
         String::new(),
         vec![
-          *tools::DYNAMO_DB_ITEM_SIZE_LIMIT
+          *constants::DYNAMO_DB_ITEM_SIZE_LIMIT
             - ByteSize::b(attachments_fill_size / 2).as_u64() as usize,
         ],
         vec!["holder0".to_string(), "holder1".to_string()],
@@ -50,7 +51,10 @@
       // a big item that should be placed in the S3 right away
       Item::new(
         String::new(),
-        vec![*tools::GRPC_CHUNK_SIZE_LIMIT, *tools::GRPC_CHUNK_SIZE_LIMIT],
+        vec![
+          *constants::GRPC_CHUNK_SIZE_LIMIT,
+          *constants::GRPC_CHUNK_SIZE_LIMIT,
+        ],
         vec![
           "holder0".to_string(),
           "holder1".to_string(),
diff --git a/services/commtest/tests/blob_integration_test.rs b/services/commtest/tests/blob_integration_test.rs
--- a/services/commtest/tests/blob_integration_test.rs
+++ b/services/commtest/tests/blob_integration_test.rs
@@ -3,7 +3,8 @@
   blob_utils::{BlobData, BlobServiceClient},
   get, put, remove,
 };
-use commtest::tools::{self, Error};
+use commtest::constants;
+use commtest::tools::Error;
 use std::env;
 
 #[tokio::test]
@@ -27,8 +28,8 @@
       holder: "test_holder002".to_string(),
       hash: "test_hash002".to_string(),
       chunks_sizes: vec![
-        *tools::GRPC_CHUNK_SIZE_LIMIT,
-        *tools::GRPC_CHUNK_SIZE_LIMIT,
+        *constants::GRPC_CHUNK_SIZE_LIMIT,
+        *constants::GRPC_CHUNK_SIZE_LIMIT,
         ByteSize::b(10).as_u64() as usize,
       ],
     },
@@ -36,9 +37,9 @@
       holder: "test_holder003".to_string(),
       hash: "test_hash003".to_string(),
       chunks_sizes: vec![
-        *tools::GRPC_CHUNK_SIZE_LIMIT,
+        *constants::GRPC_CHUNK_SIZE_LIMIT,
         ByteSize::b(100).as_u64() as usize,
-        *tools::GRPC_CHUNK_SIZE_LIMIT,
+        *constants::GRPC_CHUNK_SIZE_LIMIT,
       ],
     },
   ];