micropython: add micropython component

components/language/micropython/tests/extmod/uselect_poll_basic.py

@@ -0,0 +1,42 @@
+try:
+    import usocket as socket, uselect as select, uerrno as errno
+except ImportError:
+    try:
+        import socket, select, errno
+
+        select.poll  # Raises AttributeError for CPython implementations without poll()
+    except (ImportError, AttributeError):
+        print("SKIP")
+        raise SystemExit
+
+
+poller = select.poll()
+
+s = socket.socket()
+
+poller.register(s)
+# https://docs.python.org/3/library/select.html#select.poll.register
+# "Registering a file descriptor that’s already registered is not an error,
+# and has the same effect as registering the descriptor exactly once."
+poller.register(s)
+
+# 2 args are mandatory unlike register()
+try:
+    poller.modify(s)
+except TypeError:
+    print("modify:TypeError")
+
+poller.modify(s, select.POLLIN)
+
+poller.unregister(s)
+
+try:
+    poller.modify(s, select.POLLIN)
+except OSError as e:
+    assert e.errno == errno.ENOENT
+
+# poll after closing the socket, should return POLLNVAL
+poller.register(s)
+s.close()
+p = poller.poll(0)
+print(len(p), p[0][-1])