test.py: test get_library_path(); a few improvements and fixes.

- Fix show_devices() output.
- Use get_libusb1_backend() call for show_devices().
- Print less device info for find().

test.py

@@ -6,20 +6,28 @@
 import usb.backend.libusb1
 
 def main():
+    # Test get_library_path().
+    path = libusb_package.get_library_path()
+    print(f"Path to included library: {path}")
+
+    # Test find_library().
     libusb1_backend = usb.backend.libusb1.get_backend(find_library=libusb_package.find_library)
     if not libusb1_backend:
         print("Unable to load libusb backend!")
         sys.exit(1)
     print(f"libusb1_backend = {libusb1_backend}")
 
-    # Use pyusb directly with the loaded backend.
+    # Test get_libusb1_backend().
     print("usb.core.show_devices output:")
-    usb.core.show_devices(backend=libusb1_backend)
+    print(usb.core.show_devices(backend=libusb_package.get_libusb1_backend()))
 
     # Try out the find() wrapper.
     print("libusb_package.find output:")
     for dev in libusb_package.find(find_all=True):
-        print(dev)
+        try:
+            print(f"{dev.idVendor:04x}:{dev.idProduct:04x}: {dev.manufacturer} {dev.product} ({dev.serial_number})")
+        except Exception as err:
+            print(f"{dev.idVendor:04x}:{dev.idProduct:04x}: error reading strings ({err})")
 
 if __name__ == "__main__":
     main()