diff --git a/tests/csapi/txnid_test.go b/tests/csapi/txnid_test.go
index 1b69b8f0..bacf9104 100644
--- a/tests/csapi/txnid_test.go
+++ b/tests/csapi/txnid_test.go
@@ -1,6 +1,7 @@
 package csapi_tests
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/matrix-org/complement/internal/b"
@@ -38,30 +39,24 @@ func TestTxnInEvent(t *testing.T) {
 	res := c.MustDoFunc(t, "GET", []string{"_matrix", "client", "v3", "rooms", roomID, "event", eventID})
 	body := client.ParseJSON(t, res)
 	result := gjson.ParseBytes(body)
-	if !result.Get("unsigned.transaction_id").Exists() {
+	unsignedTxnId := result.Get("unsigned.transaction_id")
+	if !unsignedTxnId.Exists() {
 		t.Fatalf("Event did not have a 'unsigned.transaction_id' on the GET /rooms/%s/event/%s response", roomID, eventID)
 	}
 
-	txnIdFromResult:= result.Get("unsigned.transaction_id").Str
-
-	if txnIdFromResult != txnId {
-		t.Fatalf("Event did not have a 'unsigned.transaction_id' of %s on GET /rooms/%s/event/%s response. Found %s instead", txnId, eventID, roomID, txnIdFromResult)
-	}
+	must.EqualStr(t, unsignedTxnId.Str, txnId, fmt.Sprintf("Event did not have a 'unsigned.transaction_id' on GET /rooms/%s/event/%s response", eventID, roomID))
 }
 
 
 func mustHaveTransactionID(t *testing.T, roomID, eventID, expectedTxnId string) client.SyncCheckOpt {
 	return client.SyncTimelineHas(roomID, func(r gjson.Result) bool {
 		if r.Get("event_id").Str == eventID {
-			if !r.Get("unsigned.transaction_id").Exists() {
+			unsignedTxnId := r.Get("unsigned.transaction_id")
+			if !unsignedTxnId.Exists() {
 				t.Fatalf("Event %s in room %s should have a 'unsigned.transaction_id', but it did not", eventID, roomID)
 			}
 
-			txnIdFromSync := r.Get("unsigned.transaction_id").Str
-
-			if txnIdFromSync != expectedTxnId {
-				t.Fatalf("Event %s in room %s should have a 'unsigned.transaction_id' of %s but found %s", eventID, roomID, expectedTxnId, txnIdFromSync)
-			}
+			must.EqualStr(t, unsignedTxnId.Str, expectedTxnId, fmt.Sprintf("Event %s in room %s should have a 'unsigned.transaction_id'", eventID, roomID))
 
 			return true
 		}
@@ -73,9 +68,9 @@ func mustHaveTransactionID(t *testing.T, roomID, eventID, expectedTxnId string)
 func mustNotHaveTransactionID(t *testing.T, roomID, eventID string) client.SyncCheckOpt {
 	return client.SyncTimelineHas(roomID, func(r gjson.Result) bool {
 		if r.Get("event_id").Str == eventID {
-			res := r.Get("unsigned.transaction_id")
-			if res.Exists() {
-				t.Fatalf("Event %s in room %s should NOT have a 'unsigned.transaction_id', but it did (%s)", eventID, roomID, res.Str)
+			unsignedTxnId := r.Get("unsigned.transaction_id")
+			if unsignedTxnId.Exists() {
+				t.Fatalf("Event %s in room %s should NOT have a 'unsigned.transaction_id', but it did (%s)", eventID, roomID, unsignedTxnId.Str)
 			}
 
 			return true