1 files changed, 30 insertions, 0 deletions
diff --git a/testing/web-platform/tests/payment-handler/app-change-payment-method.js b/testing/web-platform/tests/payment-handler/app-change-payment-method.js
new file mode 100644
index 0000000000..0e5a4768e7
--- /dev/null
+++ b/testing/web-platform/tests/payment-handler/app-change-payment-method.js
@@ -0,0 +1,30 @@
+self.addEventListener('canmakepayment', (event) => {
+  event.respondWith(true);
+});
+
+async function responder(event) {
+  const methodName = event.methodData[0].supportedMethods;
+  if (!event.changePaymentMethod) {
+    return {
+      methodName,
+      details: {
+        changePaymentMethodReturned:
+          'The changePaymentMethod() method is not implemented.',
+      },
+    };
+  }
+  let changePaymentMethodReturned;
+  try {
+    const response = await event.changePaymentMethod(methodName, {
+      country: 'US',
+    });
+    changePaymentMethodReturned = response;
+  } catch (err) {
+    changePaymentMethodReturned = err.message;
+  }
+  return {methodName, details: {changePaymentMethodReturned}};
+}
+
+self.addEventListener('paymentrequest', (event) => {
+  event.respondWith(responder(event));
+});