tests/extmod: Add websocket tests.

These short unit tests test the base uPy methods as well as parts of the
websocket protocol, as implemented by uPy.

@dpgeorge converted the original socket based tests by @hosaka to ones
that only require io.BytesIO.

tests/extmod/websocket.py

@@ -0,0 +1,61 @@
+try:
+    import uio
+    import uerrno
+    import websocket
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
+
+# put raw data in the stream and do a websocket read
+def ws_read(msg, sz):
+    ws = websocket.websocket(uio.BytesIO(msg))
+    return ws.read(sz)
+
+# do a websocket write and then return the raw data from the stream
+def ws_write(msg, sz):
+    s = uio.BytesIO()
+    ws = websocket.websocket(s)
+    ws.write(msg)
+    s.seek(0)
+    return s.read(sz)
+
+# basic frame
+print(ws_read(b"\x81\x04ping", 4))
+print(ws_read(b"\x80\x04ping", 4)) # FRAME_CONT
+print(ws_write(b"pong", 6))
+
+# split frames are not supported
+# print(ws_read(b"\x01\x04ping", 4))
+
+# extended payloads
+print(ws_read(b'\x81~\x00\x80' + b'ping' * 32, 128))
+print(ws_write(b"pong" * 32, 132))
+
+# mask (returned data will be 'mask' ^ 'mask')
+print(ws_read(b"\x81\x84maskmask", 4))
+
+# close control frame
+s = uio.BytesIO(b'\x88\x00') # FRAME_CLOSE
+ws = websocket.websocket(s)
+print(ws.read(1))
+s.seek(2)
+print(s.read(4))
+
+# misc control frames
+print(ws_read(b"\x89\x00\x81\x04ping", 4)) # FRAME_PING
+print(ws_read(b"\x8a\x00\x81\x04pong", 4)) # FRAME_PONG
+
+# close method
+ws = websocket.websocket(uio.BytesIO())
+ws.close()
+
+# ioctl
+ws = websocket.websocket(uio.BytesIO())
+print(ws.ioctl(8)) # GET_DATA_OPTS
+print(ws.ioctl(9, 2)) # SET_DATA_OPTS
+print(ws.ioctl(9))
+try:
+    ws.ioctl(-1)
+except OSError as e:
+    print("ioctl: EINVAL:", e.args[0] == uerrno.EINVAL)

tests/extmod/websocket.py.exp

@@ -0,0 +1,14 @@
+b'ping'
+b'ping'
+b'\x81\x04pong'
+b'pingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingpingping'
+b'\x81~\x00\x80pongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpongpong'
+b'\x00\x00\x00\x00'
+b''
+b'\x81\x02\x88\x00'
+b'ping'
+b'pong'
+0
+1
+2
+ioctl: EINVAL: True