tests/extmod: Remove asyncio .exp files that match CPython output.

These were added back in commit c4935f3049
because the tests required CPython 3.8, which was quite new at the time.
But CPython 3.8 was released over 4 years ago (October 2019) and the CI
test runners, and developers, have this (or a more recent) CPython version.

Removing the .exp files also helps keep MicroPython semantics the same as
CPython.

The asyncio_fair.py test it adjusted slightly to have more deterministic
timing and output.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/asyncio_await_return.py.exp

@@ -1,2 +0,0 @@
-42
-42

tests/extmod/asyncio_basic2.py.exp

@@ -1,4 +0,0 @@
-main start
-forever start
-main done
-42

tests/extmod/asyncio_cancel_fair.py.exp

@@ -1,24 +0,0 @@
-start 0
-start 1
-start 2
-done 0
-0 cancels 1
-start 0
-cancelled 1
-1 cancels 0
-start 1
-done 2
-start 2
-cancelled 0
-0 cancels 1
-start 0
-cancelled 1
-1 cancels 0
-start 1
-done 2
-start 2
-cancelled 0
-0 cancels 1
-cancelled 1
-1 cancels 0
-done 2

tests/extmod/asyncio_cancel_fair2.py.exp

@@ -1,8 +0,0 @@
-sleep a
-sleep b 0
-sleep b 1
-sleep b 2
-cancelled a
-done b 0
-done b 1
-done b 2

tests/extmod/asyncio_cancel_task.py.exp

@@ -1,31 +0,0 @@
-True
-task start
-True
-main sleep
-task cancel
-task start
-True
-True
-True
-True
-main sleep
-task cancel
-main wait
-main got CancelledError
-task start
-task done
-False
-----
-task 2
-task start
-main cancel
-main sleep
-task cancel
-task 2 cancel
-----
-task 2
-task start
-main cancel
-main sleep
-task cancel
-task 2 done

tests/extmod/asyncio_cancel_wait_on_finished.py.exp

@@ -1,7 +0,0 @@
-main sleep
-sleep_task sleep
-wait_task wait
-main sleep
-sleep_task wake
-main wait
-CancelledError()

tests/extmod/asyncio_current_task.py.exp

@@ -1 +0,0 @@
-True

tests/extmod/asyncio_event.py.exp

@@ -1,33 +0,0 @@
-False
-True
-False
-----
-yield
-start 1
-start 2
-set event
-yield
-True
-end 1
-True
-end 2
-----
-yield
-start 3
-True
-end 3
-----
-clear event
-start 4
-set event
-True
-end 4
-----
-start 5
-----
-start 6
-----
-set event
-----
-TimeoutError
-set event

tests/extmod/asyncio_event_fair.py.exp

@@ -1,16 +0,0 @@
-sleep 0
-wait 2
-sleep 1
-wait 3
-sleep 0
-sleep 1
-wait 2
-sleep 0
-sleep 1
-wait 3
-sleep 0
-sleep 1
-wait 2
-wait 3
-wait 2
-wait 3

tests/extmod/asyncio_exception.py.exp

@@ -1,7 +0,0 @@
-main start
-ValueError 1
-main start
-task start
-ValueError 2
-main start
-ValueError 3

tests/extmod/asyncio_fair.py

@@ -20,7 +20,7 @@ async def main():
     t2 = asyncio.create_task(task(2, 0.1))
     t3 = asyncio.create_task(task(3, 0.18))
     t4 = asyncio.create_task(task(4, -100))
-    await asyncio.sleep(0.5)
+    await asyncio.sleep(0.45)  # t2 prints 5 times, t3 prints 3 times
     t1.cancel()
     t2.cancel()
     t3.cancel()

tests/extmod/asyncio_fair.py.exp

@@ -1,13 +0,0 @@
-task start 1
-task start 2
-task work 2
-task start 3
-task work 3
-task start 4
-task work 2
-task work 3
-task work 2
-task work 2
-task work 3
-task work 2
-finish

tests/extmod/asyncio_lock.py

@@ -1,4 +1,8 @@
 # Test Lock class
+#
+# This test has a corresponding .exp file because it tests a very specific ordering of
+# events when cancelling a task waiting on a lock, and that ordering should not change
+# (even though it does match CPython's output).
 
 try:
     import asyncio

tests/extmod/asyncio_lock_cancel.py.exp

@@ -1,11 +0,0 @@
-task 0 start
-task 1 start
-task 2 start
-task 3 start
-task 1 cancel
-task 2 cancel
-task 0 lock_flag False
-task 0 done
-task 3 lock_flag False
-task 3 done
-False

tests/extmod/asyncio_loop_stop.py.exp

@@ -1,7 +0,0 @@
-run 0
-start
-sleep
-run 1
-run 2
-task
-end

tests/extmod/asyncio_new_event_loop.py.exp

@@ -1,6 +0,0 @@
-start
-task 0
-stop
-start
-task 0
-stop

tests/extmod/asyncio_set_exception_handler.py.exp

@@ -1,9 +0,0 @@
-None
-True
-sleep
-custom_handler ValueError(0, 1)
-sleep
-custom_handler ValueError(1, 2)
-custom_handler ValueError(2, 3)
-ValueError(3, 4)
-done

tests/extmod/asyncio_task_done.py.exp

@@ -1,24 +0,0 @@
-==========
-False
-task start
-task done
-True
-True
-==========
-False
-task start
-False
-task done
-True
-==========
-False
-task start
-True
-ValueError()
-True
-==========
-False
-task start
-False
-ValueError()
-True