1 files changed, 71 insertions, 0 deletions
diff --git a/dom/midi/tests/browser_refresh_port_list.js b/dom/midi/tests/browser_refresh_port_list.js
new file mode 100644
index 0000000000..152b067254
--- /dev/null
+++ b/dom/midi/tests/browser_refresh_port_list.js
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const EXAMPLE_ORG_URL = "https://example.org/browser/dom/midi/tests/";
+const PAGE = "refresh_port_list.html";
+
+async function get_access(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    return content.wrappedJSObject.get_access();
+  });
+}
+
+async function reset_access(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    return content.wrappedJSObject.reset_access();
+  });
+}
+
+async function get_num_ports(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    return content.wrappedJSObject.get_num_ports();
+  });
+}
+
+async function add_port(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    return content.wrappedJSObject.add_port();
+  });
+}
+
+async function remove_port(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    return content.wrappedJSObject.remove_port();
+  });
+}
+
+async function force_refresh(browser) {
+  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], () => {
+    return content.wrappedJSObject.force_refresh();
+  });
+}
+
+add_task(async function () {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(
+    gBrowser,
+    EXAMPLE_ORG_URL + PAGE
+  );
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  await get_access(gBrowser.selectedBrowser);
+  let ports_num = await get_num_ports(gBrowser.selectedBrowser);
+  Assert.equal(ports_num, 4, "We start with four ports");
+  await add_port(gBrowser.selectedBrowser);
+  ports_num = await get_num_ports(gBrowser.selectedBrowser);
+  Assert.equal(ports_num, 5, "One port is added manually");
+  // This causes the test service to refresh the ports the next time a refresh
+  // is requested, it will happen after we reload the tab later on and will add
+  // back the port that we're removing on the next line.
+  await force_refresh(gBrowser.selectedBrowser);
+  await remove_port(gBrowser.selectedBrowser);
+  ports_num = await get_num_ports(gBrowser.selectedBrowser);
+  Assert.equal(ports_num, 4, "One port is removed manually");
+
+  await BrowserTestUtils.reloadTab(gBrowser.selectedTab);
+
+  await get_access(gBrowser.selectedBrowser);
+  let refreshed_ports_num = await get_num_ports(gBrowser.selectedBrowser);
+  Assert.equal(refreshed_ports_num, 5, "One port is added by the refresh");
+
+  gBrowser.removeTab(gBrowser.selectedTab);
+});