uasyncio.core: test_cancel_sleep: Make compatible with CPython.

Signed-off-by: Paul Sokolovsky <pfalcon@users.sourceforge.net>

uasyncio.core/test_cancel_sleep.py

@@ -1,33 +1,46 @@
-import utime
+# Runs both in Pycopy and CPython.
+import time
 try:
     import uasyncio.core as asyncio
+    is_uasyncio = True
 except ImportError:
     import asyncio
+    is_uasyncio = False
 
 
 requested = None
+cancelled = False
 
 async def coro():
+    global cancelled
     try:
         await asyncio.sleep(1)
         assert False, "sleep wasn't cancelled"
     except asyncio.CancelledError:
-        now = utime.ticks_ms()
-        diff = utime.ticks_diff(now, requested)
+        now = time.time()
+        diff = now - requested
         print("cancelled at: %s, delay: %s" % (now, diff))
-        assert diff < 10
+        assert diff < 0.01
+        cancelled = True
 
 
 async def canceller(task):
     global requested
-    asyncio.cancel(task)
-    requested = utime.ticks_ms()
+    if is_uasyncio:
+        asyncio.cancel(task)
+    else:
+        task.cancel()
+    requested = time.time()
     print("requested cancel at:", requested)
-    await asyncio.sleep(1)
+    await asyncio.sleep(0)
 
 
 loop = asyncio.get_event_loop()
 
 task = coro()
-loop.create_task(task)
+if is_uasyncio:
+    loop.create_task(task)
+else:
+    task = loop.create_task(task)
 loop.run_until_complete(canceller(task))
+assert cancelled