payment-request/onpaymentmethodchange-attribute.https.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test for onpaymentmethodchange attribute</title>
<link rel="help" href="https://w3c.github.io/browser-payment-api/#onpaymentmethodchange-attribute">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
"use strict";
const testMethod = Object.freeze({ supportedMethods: "not-a-real-method" });
const applePay = Object.freeze({
  supportedMethods: "https://apple.com/apple-pay",
  data: {
    version: 3,
    merchantIdentifier: "merchant.com.example",
    countryCode: "US",
    merchantCapabilities: ["supports3DS"],
    supportedNetworks: ["visa"],
  }
});
const defaultMethods = Object.freeze([testMethod, applePay]);
const defaultDetails = Object.freeze({
  total: {
    label: "Total",
    amount: {
      currency: "USD",
      value: "1.00",
    },
  },
});

test(() => {
  const request = new PaymentRequest(defaultMethods, defaultDetails);
  assert_idl_attribute(request, "onpaymentmethodchange");
}, "Must have a onpaymentmethodchange IDL attribute");

test(() => {
  const request = new PaymentRequest(defaultMethods, defaultDetails);
  const ev = new Event("paymentmethodchange");
  let didHandle = false;
  request.onpaymentmethodchange = evt => {
    assert_equals(ev, evt, "must be same event");
    didHandle = true;
  };
  request.dispatchEvent(ev);
  assert_true(didHandle, "event did not fire");
}, `onpaymentmethodchange attribute is a generic handler for "paymentmethodchange"`);

test(() => {
  const request = new PaymentRequest(defaultMethods, defaultDetails);
  const ev = new PaymentMethodChangeEvent("paymentmethodchange");
  let didHandle = false;
  request.onpaymentmethodchange = evt => {
    assert_equals(ev, evt, "must be same event");
    didHandle = true;
  };
  request.dispatchEvent(ev);
  assert_true(didHandle, "event did not fire");
}, `onpaymentmethodchange attribute is a handler for PaymentMethodChangeEvent`);

test(() => {
  const request = new PaymentRequest(defaultMethods, defaultDetails);
  const ev = new PaymentMethodChangeEvent("paymentmethodchange", {
    methodName: "test"
  });
  let didHandle = false;
  let didListen = false;
  request.onpaymentmethodchange = evt => {
    assert_equals(ev, evt, "must be same event");
    didHandle = true;
  };
  request.addEventListener("paymentmethodchange", evt => {
    assert_equals(ev, evt, "must be same event");
    didListen = true;
  });
  request.dispatchEvent(ev);
  assert_true(didHandle, "onpaymentmethodchange did not receive the event");
  assert_true(didListen, "addEventListener did not receive the event");
}, `onpaymentmethodchange attribute and listeners both work`);
</script>