asyncio: Add asyncio tests for new task features.

tests/extmod/asyncio_task_add_done_callback.py

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+# Test the Task.add_done_callback() method
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def task(t, exc=None):
+    if t >= 0:
+        await asyncio.sleep(t)
+    if exc:
+        raise exc
+
+
+def done_callback(t, er):
+    print("done", repr(t), repr(er))
+
+
+async def main():
+    # Tasks that aren't done only execute done callback after finishing
+    print("=" * 10)
+    t = asyncio.create_task(task(-1))
+    t.add_done_callback(done_callback)
+    print("Waiting for task to complete")
+    await asyncio.sleep(0)
+    print("Task has completed")
+
+    # Task that are done run the callback immediately
+    print("=" * 10)
+    t = asyncio.create_task(task(-1))
+    await asyncio.sleep(0)
+    print("Task has completed")
+    t.add_done_callback(done_callback)
+    print("Callback Added")
+
+    # Task that starts, runs and finishes without an exception should return None
+    print("=" * 10)
+    t = asyncio.create_task(task(0.01))
+    t.add_done_callback(done_callback)
+    try:
+        t.add_done_callback(done_callback)
+    except RuntimeError as e:
+        print("Second call to add_done_callback emits error:", repr(e))
+
+    # Task that raises immediately should still run done callback
+    print("=" * 10)
+    t = asyncio.create_task(task(-1, ValueError))
+    t.add_done_callback(done_callback)
+    await asyncio.sleep(0)
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_add_done_callback.py.exp

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+==========
+Waiting for task to complete
+done <Task> StopIteration()
+Task has completed
+==========
+Task has completed
+done <Task> StopIteration()
+Callback Added
+==========
+Second call to add_done_callback emits error: RuntimeError('>1 callback unsupported',)
+==========
+done <Task> ValueError()

tests/extmod/asyncio_task_cancelled.py

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+# Test the `Task.cancelled` method
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def task(t):
+    await asyncio.sleep(t)
+
+
+async def main():
+    # Cancel task immediately doesn't mark the task as cancelled
+    print("=" * 10)
+    t = asyncio.create_task(task(2))
+    t.cancel()
+    print("Expecting task to not be cancelled because it is not done:", t.cancelled())
+
+    # Cancel task immediately and wait for cancellation to complete
+    print("=" * 10)
+    t = asyncio.create_task(task(2))
+    t.cancel()
+    await asyncio.sleep(0)
+    print("Expecting Task to be Cancelled:", t.cancelled())
+
+    # Cancel task and wait for cancellation to complete
+    print("=" * 10)
+    t = asyncio.create_task(task(2))
+    await asyncio.sleep(0.01)
+    t.cancel()
+    await asyncio.sleep(0)
+    print("Expecting Task to be Cancelled:", t.cancelled())
+
+    # Cancel task multiple times after it has started
+    print("=" * 10)
+    t = asyncio.create_task(task(2))
+    await asyncio.sleep(0.01)
+    for _ in range(4):
+        t.cancel()
+    await asyncio.sleep(0.01)
+
+    print("Expecting Task to be Cancelled:", t.cancelled())
+
+    # Cancel task after it has finished
+    print("=" * 10)
+    t = asyncio.create_task(task(0.01))
+    await asyncio.sleep(0.05)
+    t.cancel()
+    print("Expecting task to not be Cancelled:", t.cancelled())
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_cancelled.py.exp

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+==========
+Expecting task to not be cancelled because it is not done: False
+==========
+Expecting Task to be Cancelled: True
+==========
+Expecting Task to be Cancelled: True
+==========
+Expecting Task to be Cancelled: True
+==========
+Expecting task to not be Cancelled: False

tests/extmod/asyncio_task_exception.py

@@ -0,0 +1,64 @@
+# Test the Task.exception() method
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def task(t, exc=None):
+    if t >= 0:
+        await asyncio.sleep(t)
+    if exc:
+        raise exc
+
+
+async def main():
+    # Task that is not done yet raises an InvalidStateError
+    print("=" * 10)
+    t = asyncio.create_task(task(1))
+    await asyncio.sleep(0)
+    try:
+        t.exception()
+        assert False, "Should not get here"
+    except Exception as e:
+        print("Tasks that aren't done yet raise an InvalidStateError:", repr(e))
+
+    # Task that is cancelled raises CancelledError
+    print("=" * 10)
+    t = asyncio.create_task(task(1))
+    t.cancel()
+    await asyncio.sleep(0)
+    try:
+        print(repr(t.exception()))
+        print(t.cancelled())
+        assert False, "Should not get here"
+    except asyncio.CancelledError as e:
+        print("Cancelled tasks cannot retrieve exception:", repr(e))
+
+    # Task that starts, runs and finishes without an exception should return None
+    print("=" * 10)
+    t = asyncio.create_task(task(0.01))
+    await t
+    print("None when no exception:", t.exception())
+
+    # Task that raises immediately should return that exception
+    print("=" * 10)
+    t = asyncio.create_task(task(-1, ValueError))
+    try:
+        await t
+        assert False, "Should not get here"
+    except ValueError as e:
+        pass
+    print("Returned Exception:", repr(t.exception()))
+
+    # Task returns `none` when somehow an exception isn't in data
+    print("=" * 10)
+    t = asyncio.create_task(task(-1))
+    await t
+    t.data = "Example"
+    print(t.exception())
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_exception.py.exp

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+==========
+Tasks that aren't done yet raise an InvalidStateError: InvalidStateError()
+==========
+Cancelled tasks cannot retrieve exception: CancelledError()
+==========
+None when no exception: None
+==========
+Returned Exception: ValueError()
+==========
+None

tests/extmod/asyncio_task_get_coro.py

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+# Test the `Task.get_coro()` method
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def action():
+    pass
+
+
+async def main():
+    # Check that the coro we include is the same coro we get back
+    print("=" * 10)
+
+    coro = action()
+    t = asyncio.create_task(coro)
+    print(t.get_coro() == coro)
+
+    # Check that the coro prop matches the get_coro() result
+    print("=" * 10)
+    t = asyncio.create_task(action())
+    print(t.get_coro() == t.coro)
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_get_coro.py.exp

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+==========
+True
+==========
+True

tests/extmod/asyncio_task_hash.py

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+# Test hash unary operator for a Task
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def task():
+    pass
+
+
+async def main():
+    # Confirm that the hash is an int
+    print("=" * 10)
+    t1 = asyncio.create_task(task())
+    t2 = asyncio.create_task(task())
+    print(type(hash(t2)))
+    print(type(hash(t1)))
+
+    # Check that two tasks don't have the same hash
+    print("=" * 10)
+    t1 = asyncio.create_task(task())
+    t2 = asyncio.create_task(task())
+    print(hash(t1) != hash(t2))
+
+    # Add tasks to a set
+    print("=" * 10)
+    t1 = asyncio.create_task(task())
+    t2 = asyncio.create_task(task())
+
+    tasks = set()
+    tasks.add(t1)
+    print(t1 in tasks)
+    print(t2 in tasks)
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_hash.py.exp

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+==========
+<class 'int'>
+<class 'int'>
+==========
+True
+==========
+True
+False

tests/extmod/asyncio_task_remove_done_callback.py

@@ -0,0 +1,59 @@
+# Test the Task.remove_done_callback() method
+
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+
+async def task(t, exc=None):
+    if t >= 0:
+        await asyncio.sleep(t)
+    if exc:
+        raise exc
+
+
+def done_callback():
+    print("done")
+
+
+def done_callback_2():
+    print("done 2")
+
+
+async def main():
+    # Removing a callback returns 0 when no callbacks have been set
+    print("=" * 10)
+    t = asyncio.create_task(task(1))
+    print("Returns 0 when no done callback has been set:", t.remove_done_callback(done_callback))
+
+    # Done callback removal only works once
+    print("=" * 10)
+    t = asyncio.create_task(task(1))
+    t.add_done_callback(done_callback)
+    print(
+        "Returns 1 when a callback matches and is removed:", t.remove_done_callback(done_callback)
+    )
+    print(
+        "Returns 0 on second attempt to remove the callback:",
+        t.remove_done_callback(done_callback),
+    )
+
+    # Only removes done callback when match
+    print("=" * 10)
+    t = asyncio.create_task(task(0.01))
+    t.add_done_callback(done_callback)
+    print("Returns 0 when done callbacks don't match:", t.remove_done_callback(done_callback_2))
+
+    # A removed done callback does not execute
+    print("=" * 10)
+    t = asyncio.create_task(task(-1))
+    t.add_done_callback(done_callback)
+    t.remove_done_callback(done_callback)
+    print("Waiting for task to complete")
+    await t
+    print("Task completed")
+
+
+asyncio.run(main())

tests/extmod/asyncio_task_remove_done_callback.py.exp

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+==========
+Returns 0 when no done callback has been set: 0
+==========
+Returns 1 when a callback matches and is removed: 1
+Returns 0 on second attempt to remove the callback: 0
+==========
+Returns 0 when done callbacks don't match: 0
+==========
+Waiting for task to complete
+Task completed