diff --git a/src/iface/interface/tests/ipv4.rs b/src/iface/interface/tests/ipv4.rs
index 85fb82c5e..41e35301c 100644
--- a/src/iface/interface/tests/ipv4.rs
+++ b/src/iface/interface/tests/ipv4.rs
@@ -721,20 +721,14 @@ fn test_handle_igmp(#[case] medium: Medium) {
     }
 
     // General query
-    let timestamp = Instant::ZERO;
     const GENERAL_QUERY_BYTES: &[u8] = &[
         0x46, 0xc0, 0x00, 0x24, 0xed, 0xb4, 0x00, 0x00, 0x01, 0x02, 0x47, 0x43, 0xac, 0x16, 0x63,
         0x04, 0xe0, 0x00, 0x00, 0x01, 0x94, 0x04, 0x00, 0x00, 0x11, 0x64, 0xec, 0x8f, 0x00, 0x00,
         0x00, 0x00, 0x02, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
         0x00,
     ];
-    {
-        // Transmit GENERAL_QUERY_BYTES into loopback
-        let tx_token = device.transmit(timestamp).unwrap();
-        tx_token.consume(GENERAL_QUERY_BYTES.len(), |buffer| {
-            buffer.copy_from_slice(GENERAL_QUERY_BYTES);
-        });
-    }
+    device.rx_queue.push_back(GENERAL_QUERY_BYTES.to_vec());
+
     // Trigger processing until all packets received through the
     // loopback have been processed, including responses to
     // GENERAL_QUERY_BYTES. Therefore `recv_all()` would return 0
diff --git a/src/iface/interface/tests/mod.rs b/src/iface/interface/tests/mod.rs
index db8cc89dd..fe98ddd3d 100644
--- a/src/iface/interface/tests/mod.rs
+++ b/src/iface/interface/tests/mod.rs
@@ -30,10 +30,8 @@ fn fill_slice(s: &mut [u8], val: u8) {
 #[allow(unused)]
 fn recv_all(device: &mut crate::tests::TestingDevice, timestamp: Instant) -> Vec<Vec<u8>> {
     let mut pkts = Vec::new();
-    while let Some((rx, _tx)) = device.receive(timestamp) {
-        rx.consume(|pkt| {
-            pkts.push(pkt.to_vec());
-        });
+    while let Some(pkt) = device.tx_queue.pop_front() {
+        pkts.push(pkt)
     }
     pkts
 }
diff --git a/src/iface/interface/tests/sixlowpan.rs b/src/iface/interface/tests/sixlowpan.rs
index b80024a8b..14a4c46ae 100644
--- a/src/iface/interface/tests/sixlowpan.rs
+++ b/src/iface/interface/tests/sixlowpan.rs
@@ -244,7 +244,7 @@ fn test_echo_request_sixlowpan_128_bytes() {
     );
 
     assert_eq!(
-        device.queue.pop_front().unwrap(),
+        device.tx_queue.pop_front().unwrap(),
         &[
             0x41, 0xcc, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x2, 0x2, 0x2,
             0x2, 0x2, 0x2, 0x2, 0xc0, 0xb0, 0x5, 0x4e, 0x7a, 0x11, 0x3a, 0x92, 0xfc, 0x48, 0xc2,
@@ -261,7 +261,7 @@ fn test_echo_request_sixlowpan_128_bytes() {
     iface.poll(Instant::now(), &mut device, &mut sockets);
 
     assert_eq!(
-        device.queue.pop_front().unwrap(),
+        device.tx_queue.pop_front().unwrap(),
         &[
             0x41, 0xcc, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x2, 0x2, 0x2,
             0x2, 0x2, 0x2, 0x2, 0xe0, 0xb0, 0x5, 0x4e, 0xf, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d,
@@ -415,7 +415,7 @@ In at rhoncus tortor. Cras blandit tellus diam, varius vestibulum nibh commodo n
     iface.poll(Instant::now(), &mut device, &mut sockets);
 
     assert_eq!(
-        device.queue.pop_front().unwrap(),
+        device.tx_queue.pop_front().unwrap(),
         &[
             0x41, 0xcc, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x2, 0x2, 0x2,
             0x2, 0x2, 0x2, 0x2, 0xc0, 0xb4, 0x5, 0x4e, 0x7e, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
@@ -430,7 +430,7 @@ In at rhoncus tortor. Cras blandit tellus diam, varius vestibulum nibh commodo n
     );
 
     assert_eq!(
-        device.queue.pop_front().unwrap(),
+        device.tx_queue.pop_front().unwrap(),
         &[
             0x41, 0xcc, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x2, 0x2, 0x2,
             0x2, 0x2, 0x2, 0x2, 0xe0, 0xb4, 0x5, 0x4e, 0xf, 0x6f, 0x72, 0x74, 0x6f, 0x72, 0x2e,