Test large bulk transfers with high-speed devices

Suggested when reviewing the parent commit. I remember manually adding
extra test cases when I was testing, so it'll be nice to have these
automatically tested when the device can support it.

Author: mciantyre

tests/test_class_host/device.rs

@@ -13,6 +13,11 @@ pub struct DeviceHandles {
 }
 
 impl DeviceHandles {
+    /// Indicates if this device is (true) or isn't (false) a
+    /// high-speed device.
+    pub fn is_high_speed(&self) -> bool {
+        self.handle.device().speed() == rusb::Speed::High
+    }
     /// Returns the max packet size for the `TestClass` bulk endpoint(s).
     pub fn bulk_max_packet_size(&self) -> u16 {
         self.config_descriptor

tests/test_class_host/tests.rs

@@ -164,8 +164,13 @@ fn interface_descriptor(dev, _out) {
 }
 
 fn bulk_loopback(dev, _out) {
+    let mut lens = vec![0, 1, 2, 32, 63, 64, 65, 127, 128, 129];
+    if dev.is_high_speed() {
+        lens.extend([255, 256, 257, 511, 512, 513, 1023, 1024, 1025]);
+    }
+
     let max_packet_size: usize = dev.bulk_max_packet_size().into();
-    for len in &[0, 1, 2, 32, 63, 64, 65, 127, 128, 129] {
+    for len in &lens {
         let data = random_data(*len);
 
         assert_eq!(