Add test for new uuid function, fix doctest.

Author: bheisler

src/device.rs

@@ -367,7 +367,7 @@ impl Device {
  /// # init(CudaFlags::empty())?;
  /// use rustacuda::device::Device;
  /// let device = Device::get_device(0)?;
- /// println!("Device UUID: {}", device.uuid()?);
+ /// println!("Device UUID: {:?}", device.uuid()?);
  /// # Ok(())
  /// # }
  /// ```
@@ -481,4 +481,12 @@ mod test {
  CUdevice_attribute_enum::CU_DEVICE_ATTRIBUTE_MAX as u32
  );
  }
+
+ #[test]
+ fn test_uuid() -> Result<(), Box<dyn Error>> {
+ test_init()?;
+ let uuid = Device::get_device(0)?.uuid()?;
+ println!("{:?}", uuid);
+ Ok(())
+ }
 }