diff --git a/Cargo.toml b/Cargo.toml
index 425b79ed..7ace02b5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,5 +58,6 @@ ws-tokio = ["soketto", "url", "tokio", "tokio-util"]
 ws-async-std = ["soketto", "url", "async-std"]
 ws-tls-tokio = ["async-native-tls", "native-tls", "async-native-tls/runtime-tokio", "ws-tokio"]
 ws-tls-async-std = ["async-native-tls", "native-tls", "async-native-tls/runtime-async-std", "ws-async-std"]
+test = []
 
 [workspace]
diff --git a/src/api/accounts.rs b/src/api/accounts.rs
index 2d0468f2..6424adb7 100644
--- a/src/api/accounts.rs
+++ b/src/api/accounts.rs
@@ -234,8 +234,8 @@ impl Transaction {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::helpers::tests::TestTransport;
     use crate::signing::{SecretKey, SecretKeyRef};
+    use crate::transports::test::TestTransport;
     use crate::types::Bytes;
     use rustc_hex::FromHex;
     use serde_json::json;
diff --git a/src/api/eth_filter.rs b/src/api/eth_filter.rs
index d815f54a..3fc68d4d 100644
--- a/src/api/eth_filter.rs
+++ b/src/api/eth_filter.rs
@@ -202,8 +202,8 @@ impl<T: Transport> EthFilter<T> {
 mod tests {
     use super::EthFilter;
     use crate::api::Namespace;
-    use crate::helpers::tests::TestTransport;
     use crate::rpc::Value;
+    use crate::transports::test::TestTransport;
     use crate::types::{Address, Bytes, FilterBuilder, Log, H256};
     use futures::stream::StreamExt;
     use std::time::Duration;
diff --git a/src/confirm.rs b/src/confirm.rs
index 0a0b8e15..4b12eace 100644
--- a/src/confirm.rs
+++ b/src/confirm.rs
@@ -117,8 +117,8 @@ where
 #[cfg(test)]
 mod tests {
     use super::send_transaction_with_confirmation;
-    use crate::helpers::tests::TestTransport;
     use crate::rpc::Value;
+    use crate::transports::test::TestTransport;
     use crate::types::{Address, TransactionReceipt, TransactionRequest, H256, U64};
     use serde_json::json;
     use std::time::Duration;
diff --git a/src/contract/deploy.rs b/src/contract/deploy.rs
index 55934039..91ffa606 100644
--- a/src/contract/deploy.rs
+++ b/src/contract/deploy.rs
@@ -165,8 +165,8 @@ impl<T: Transport> Builder<T> {
 mod tests {
     use crate::api::{self, Namespace};
     use crate::contract::{Contract, Options};
-    use crate::helpers::tests::TestTransport;
     use crate::rpc;
+    use crate::transports::test::TestTransport;
     use crate::types::{Address, U256};
     use serde_json::Value;
     use std::collections::HashMap;
diff --git a/src/contract/mod.rs b/src/contract/mod.rs
index 3d21034e..daf18018 100644
--- a/src/contract/mod.rs
+++ b/src/contract/mod.rs
@@ -323,8 +323,8 @@ impl<T: Transport> Contract<T> {
 mod tests {
     use super::{Contract, Options};
     use crate::api::{self, Namespace};
-    use crate::helpers::tests::TestTransport;
     use crate::rpc;
+    use crate::transports::test::TestTransport;
     use crate::types::{Address, BlockId, BlockNumber, H256, U256};
     use crate::Transport;
 
diff --git a/src/helpers.rs b/src/helpers.rs
index f21842c9..41c26da7 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -95,74 +95,6 @@ pub fn to_result_from_output(output: rpc::Output) -> error::Result<rpc::Value> {
 #[macro_use]
 #[cfg(test)]
 pub mod tests {
-    use crate::error::{self, Error};
-    use crate::rpc;
-    use crate::{RequestId, Transport};
-    use futures::future::{self, BoxFuture, FutureExt};
-    use std::cell::RefCell;
-    use std::collections::VecDeque;
-    use std::rc::Rc;
-
-    type Result<T> = BoxFuture<'static, error::Result<T>>;
-
-    #[derive(Debug, Default, Clone)]
-    pub struct TestTransport {
-        asserted: usize,
-        requests: Rc<RefCell<Vec<(String, Vec<rpc::Value>)>>>,
-        responses: Rc<RefCell<VecDeque<rpc::Value>>>,
-    }
-
-    impl Transport for TestTransport {
-        type Out = Result<rpc::Value>;
-
-        fn prepare(&self, method: &str, params: Vec<rpc::Value>) -> (RequestId, rpc::Call) {
-            let request = super::build_request(1, method, params.clone());
-            self.requests.borrow_mut().push((method.into(), params));
-            (self.requests.borrow().len(), request)
-        }
-
-        fn send(&self, id: RequestId, request: rpc::Call) -> Result<rpc::Value> {
-            future::ready(match self.responses.borrow_mut().pop_front() {
-                Some(response) => Ok(response),
-                None => {
-                    println!("Unexpected request (id: {:?}): {:?}", id, request);
-                    Err(Error::Unreachable)
-                }
-            })
-            .boxed()
-        }
-    }
-
-    impl TestTransport {
-        pub fn set_response(&mut self, value: rpc::Value) {
-            *self.responses.borrow_mut() = vec![value].into();
-        }
-
-        pub fn add_response(&mut self, value: rpc::Value) {
-            self.responses.borrow_mut().push_back(value);
-        }
-
-        pub fn assert_request(&mut self, method: &str, params: &[String]) {
-            let idx = self.asserted;
-            self.asserted += 1;
-
-            let (m, p) = self.requests.borrow().get(idx).expect("Expected result.").clone();
-            assert_eq!(&m, method);
-            let p: Vec<String> = p.into_iter().map(|p| serde_json::to_string(&p).unwrap()).collect();
-            assert_eq!(p, params);
-        }
-
-        pub fn assert_no_more_requests(&self) {
-            let requests = self.requests.borrow();
-            assert_eq!(
-                self.asserted,
-                requests.len(),
-                "Expected no more requests, got: {:?}",
-                &requests[self.asserted..]
-            );
-        }
-    }
-
     macro_rules! rpc_test {
     // With parameters
     (
@@ -172,7 +104,7 @@ pub mod tests {
       #[test]
       fn $test_name() {
         // given
-        let mut transport = $crate::helpers::tests::TestTransport::default();
+        let mut transport = $crate::transports::test::TestTransport::default();
         transport.set_response($returned);
         let result = {
           let eth = $namespace::new(&transport);
@@ -207,7 +139,7 @@ pub mod tests {
       #[test]
       fn $test_name() {
         // given
-        let mut transport = $crate::helpers::tests::TestTransport::default();
+        let mut transport = $crate::transports::test::TestTransport::default();
         transport.set_response($returned);
         let result = {
           let eth = $namespace::new(&transport);
diff --git a/src/transports/mod.rs b/src/transports/mod.rs
index ced6bf6e..fe80a2a5 100644
--- a/src/transports/mod.rs
+++ b/src/transports/mod.rs
@@ -15,6 +15,9 @@ pub mod ws;
 #[cfg(any(feature = "ws-tokio", feature = "ws-async-std"))]
 pub use self::ws::WebSocket;
 
+#[cfg(any(feature = "test", test))]
+pub mod test;
+
 #[cfg(feature = "url")]
 impl From<url::ParseError> for crate::Error {
     fn from(err: url::ParseError) -> Self {
diff --git a/src/transports/test.rs b/src/transports/test.rs
new file mode 100644
index 00000000..1ac9581f
--- /dev/null
+++ b/src/transports/test.rs
@@ -0,0 +1,75 @@
+//! Test Transport
+
+use crate::error::{self, Error};
+use crate::helpers;
+use crate::rpc;
+use crate::{RequestId, Transport};
+use futures::future::{self, BoxFuture, FutureExt};
+use std::cell::RefCell;
+use std::collections::VecDeque;
+use std::rc::Rc;
+
+type Result<T> = BoxFuture<'static, error::Result<T>>;
+
+/// Test Transport
+#[derive(Debug, Default, Clone)]
+pub struct TestTransport {
+    asserted: usize,
+    requests: Rc<RefCell<Vec<(String, Vec<rpc::Value>)>>>,
+    responses: Rc<RefCell<VecDeque<rpc::Value>>>,
+}
+
+impl Transport for TestTransport {
+    type Out = Result<rpc::Value>;
+
+    fn prepare(&self, method: &str, params: Vec<rpc::Value>) -> (RequestId, rpc::Call) {
+        let request = helpers::build_request(1, method, params.clone());
+        self.requests.borrow_mut().push((method.into(), params));
+        (self.requests.borrow().len(), request)
+    }
+
+    fn send(&self, id: RequestId, request: rpc::Call) -> Result<rpc::Value> {
+        future::ready(match self.responses.borrow_mut().pop_front() {
+            Some(response) => Ok(response),
+            None => {
+                println!("Unexpected request (id: {:?}): {:?}", id, request);
+                Err(Error::Unreachable)
+            }
+        })
+        .boxed()
+    }
+}
+
+impl TestTransport {
+    /// Set response
+    pub fn set_response(&mut self, value: rpc::Value) {
+        *self.responses.borrow_mut() = vec![value].into();
+    }
+
+    /// Add response
+    pub fn add_response(&mut self, value: rpc::Value) {
+        self.responses.borrow_mut().push_back(value);
+    }
+
+    /// Assert request
+    pub fn assert_request(&mut self, method: &str, params: &[String]) {
+        let idx = self.asserted;
+        self.asserted += 1;
+
+        let (m, p) = self.requests.borrow().get(idx).expect("Expected result.").clone();
+        assert_eq!(&m, method);
+        let p: Vec<String> = p.into_iter().map(|p| serde_json::to_string(&p).unwrap()).collect();
+        assert_eq!(p, params);
+    }
+
+    /// Assert no more requests
+    pub fn assert_no_more_requests(&self) {
+        let requests = self.requests.borrow();
+        assert_eq!(
+            self.asserted,
+            requests.len(),
+            "Expected no more requests, got: {:?}",
+            &requests[self.asserted..]
+        );
+    }
+}