1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webusb/usbAlternateInterface.https.any.js b/testing/web-platform/tests/webusb/usbAlternateInterface.https.any.js
new file mode 100644
index 0000000000..e97d53c16d
--- /dev/null
+++ b/testing/web-platform/tests/webusb/usbAlternateInterface.https.any.js
@@ -0,0 +1,34 @@
+// META: script=/resources/test-only-api.js
+// META: script=/webusb/resources/fake-devices.js
+// META: script=/webusb/resources/usb-helpers.js
+'use strict';
+
+usb_test(async () => {
+  let { device } = await getFakeDevice();
+  let configuration = new USBConfiguration(
+      device, device.configurations[1].configurationValue);
+  let usbInterface = new USBInterface(
+      configuration, configuration.interfaces[0].interfaceNumber);
+  let alternateInterface = new USBAlternateInterface(
+      usbInterface, usbInterface.alternates[1].alternateSetting);
+  assertDeviceInfoEquals(
+      alternateInterface,
+      fakeDeviceInit.configurations[1].interfaces[0].alternates[1]);
+}, 'Can construct a USBAlternateInterface.');
+
+usb_test(async () => {
+  let { device } = await getFakeDevice();
+  let configuration = new USBConfiguration(
+      device, device.configurations[1].configurationValue);
+  let usbInterface = new USBInterface(
+      configuration, configuration.interfaces[0].interfaceNumber);
+  try {
+    let alternateInterface = new USBAlternateInterface(
+        usbInterface, usbInterface.alternates.length);
+    assert_unreached(
+        'USBAlternateInterface should reject an invalid alternate setting');
+  } catch (error) {
+    assert_equals(error.name, 'RangeError');
+  }
+}, 'Constructing a USBAlternateInterface with an invalid alternate setting ' +
+    'throws a range error.');