chore(internal): improve reliability of cancel delay test

client_test.go

@@ -4,6 +4,8 @@ package lithic_test
 
 import (
 	"context"
+	"fmt"
+	"net/http"
 	"testing"
 	"time"
 
@@ -21,15 +23,23 @@ func TestCancel(t *testing.T) {
 	res, err := client.Cards.New(cancelCtx, lithic.CardNewParams{
 		Type: lithic.F(lithic.CardNewParamsTypeSingleUse),
 	})
-	if err == nil && res != nil {
+	if err == nil || res != nil {
 		t.Error("Expected there to be a cancel error and for the response to be nil")
 	}
 }
 
+type neverTransport struct{}
+
+func (t *neverTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	<-req.Context().Done()
+	return nil, fmt.Errorf("cancelled")
+}
+
 func TestCancelDelay(t *testing.T) {
 	client := lithic.NewClient(
 		option.WithBaseURL("http://127.0.0.1:4010"),
 		option.WithAPIKey("APIKey"),
+		option.WithHTTPClient(&http.Client{Transport: &neverTransport{}}),
 	)
 	cancelCtx, cancel := context.WithCancel(context.Background())
 	go func() {
@@ -39,7 +49,7 @@ func TestCancelDelay(t *testing.T) {
 	res, err := client.Cards.New(cancelCtx, lithic.CardNewParams{
 		Type: lithic.F(lithic.CardNewParamsTypeSingleUse),
 	})
-	if err == nil && res != nil {
+	if err == nil || res != nil {
 		t.Error("Expected there to be a cancel error and for the response to be nil")
 	}
 }