diff --git a/masq/Cargo.toml b/masq/Cargo.toml
index 87a20ad67..6a5e9e5aa 100644
--- a/masq/Cargo.toml
+++ b/masq/Cargo.toml
@@ -19,6 +19,7 @@ linefeed = "0.6.0"
 masq_lib = { path = "../masq_lib" }
 num = "0.4.0"
 regex = "1.5.4"
+test_utilities = { path = "../test_utilities" }
 thousands = "0.2.0"
 websocket = {version = "0.26.2", default-features = false, features = ["sync"]}
 ctrlc = "3.2.1"
diff --git a/masq/src/command_context.rs b/masq/src/command_context.rs
index 41308e5bb..e648da218 100644
--- a/masq/src/command_context.rs
+++ b/masq/src/command_context.rs
@@ -156,12 +156,12 @@ mod tests {
     use crate::test_utils::mocks::TRANSACT_TIMEOUT_MILLIS_FOR_TESTS;
     use masq_lib::messages::{FromMessageBody, UiCrashRequest, UiSetupRequest};
     use masq_lib::messages::{ToMessageBody, UiShutdownRequest, UiShutdownResponse};
-    use masq_lib::test_utils::fake_stream_holder::{ByteArrayReader, ByteArrayWriter};
     use masq_lib::test_utils::mock_websockets_server::MockWebSocketsServer;
     use masq_lib::ui_gateway::MessageBody;
     use masq_lib::ui_gateway::MessagePath::Conversation;
     use masq_lib::ui_traffic_converter::{TrafficConversionError, UnmarshalError};
     use masq_lib::utils::{find_free_port, running_test};
+    use test_utilities::byte_array_reader_writer::{ByteArrayReader, ByteArrayWriter};
 
     #[test]
     fn constant_has_correct_values() {
diff --git a/masq/src/interactive_mode.rs b/masq/src/interactive_mode.rs
index a9141ffa5..026ed4aef 100644
--- a/masq/src/interactive_mode.rs
+++ b/masq/src/interactive_mode.rs
@@ -168,10 +168,11 @@ mod tests {
         CommandFactoryMock, CommandProcessorMock, TerminalActiveMock, TerminalPassiveMock,
     };
     use crossbeam_channel::bounded;
-    use masq_lib::test_utils::fake_stream_holder::{ByteArrayWriter, FakeStreamHolder};
+    use masq_lib::test_utils::fake_stream_holder::FakeStreamHolder;
     use std::sync::{Arc, Mutex};
     use std::thread;
     use std::time::{Duration, Instant};
+    use test_utilities::byte_array_reader_writer::ByteArrayWriter;
 
     #[test]
     fn interactive_mode_works_for_unrecognized_command() {
diff --git a/masq/src/notifications/connection_change_notification.rs b/masq/src/notifications/connection_change_notification.rs
index 9ea7d5911..0480660fb 100644
--- a/masq/src/notifications/connection_change_notification.rs
+++ b/masq/src/notifications/connection_change_notification.rs
@@ -34,9 +34,9 @@ impl ConnectionChangeNotification {
 mod tests {
     use super::*;
     use crate::test_utils::mocks::TerminalPassiveMock;
-    use masq_lib::test_utils::fake_stream_holder::ByteArrayWriter;
     use masq_lib::utils::running_test;
     use std::sync::Arc;
+    use test_utilities::byte_array_reader_writer::ByteArrayWriter;
 
     #[test]
     fn broadcasts_connected_to_neighbor() {
diff --git a/masq/src/notifications/crashed_notification.rs b/masq/src/notifications/crashed_notification.rs
index 36e0ff4f4..66dfc773c 100644
--- a/masq/src/notifications/crashed_notification.rs
+++ b/masq/src/notifications/crashed_notification.rs
@@ -63,9 +63,9 @@ impl CrashNotifier {
 mod tests {
     use super::*;
     use crate::test_utils::mocks::TerminalPassiveMock;
-    use masq_lib::test_utils::fake_stream_holder::ByteArrayWriter;
     use masq_lib::utils::running_test;
     use std::sync::Arc;
+    use test_utilities::byte_array_reader_writer::ByteArrayWriter;
 
     #[test]
     pub fn handles_child_wait_failure() {
diff --git a/masq/src/terminal/integration_test_utils.rs b/masq/src/terminal/integration_test_utils.rs
index 7f42f72f5..526e19a66 100644
--- a/masq/src/terminal/integration_test_utils.rs
+++ b/masq/src/terminal/integration_test_utils.rs
@@ -187,9 +187,9 @@ mod tests {
     use crate::terminal::terminal_interface::TerminalWrapper;
     use crate::test_utils::mocks::StdoutBlender;
     use crossbeam_channel::{bounded, unbounded};
-    use masq_lib::test_utils::fake_stream_holder::ByteArrayReader;
     use std::thread;
     use std::time::Duration;
+    use test_utilities::byte_array_reader_writer::ByteArrayReader;
 
     #[test]
     fn constants_have_correct_values() {
diff --git a/masq/src/test_utils/mocks.rs b/masq/src/test_utils/mocks.rs
index 955fa578a..9f70b7e5b 100644
--- a/masq/src/test_utils/mocks.rs
+++ b/masq/src/test_utils/mocks.rs
@@ -15,7 +15,6 @@ use linefeed::memory::MemoryTerminal;
 use linefeed::{Interface, ReadResult, Signal};
 use masq_lib::command::StdStreams;
 use masq_lib::constants::DEFAULT_UI_PORT;
-use masq_lib::test_utils::fake_stream_holder::{ByteArrayWriter, ByteArrayWriterInner};
 use masq_lib::ui_gateway::MessageBody;
 use std::cell::RefCell;
 use std::fmt::Arguments;
@@ -23,6 +22,7 @@ use std::io::{Read, Write};
 use std::sync::{Arc, Mutex};
 use std::time::Duration;
 use std::{io, thread};
+use test_utilities::byte_array_reader_writer::{ByteArrayWriter, ByteArrayWriterInner};
 
 pub const TRANSACT_TIMEOUT_MILLIS_FOR_TESTS: u64 = DEFAULT_TRANSACT_TIMEOUT_MILLIS;
 
diff --git a/node/Cargo.lock b/node/Cargo.lock
index 5bd327757..fabda2b8a 100644
--- a/node/Cargo.lock
+++ b/node/Cargo.lock
@@ -1855,6 +1855,7 @@ dependencies = [
  "nix 0.23.1",
  "num",
  "regex",
+ "test_utilities",
  "thousands",
  "time 0.3.11",
  "websocket",