1 files changed, 45 insertions, 0 deletions
diff --git a/tests/extmod/asyncio_basic.py b/tests/extmod/asyncio_basic.py
new file mode 100644
index 0000000000..ca37c7bcb0
--- /dev/null
+++ b/tests/extmod/asyncio_basic.py
@@ -0,0 +1,45 @@
+try:
+    import asyncio
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+import time
+
+if hasattr(time, "ticks_ms"):
+    ticks = time.ticks_ms
+    ticks_diff = time.ticks_diff
+else:
+    ticks = lambda: int(time.time() * 1000)
+    ticks_diff = lambda t1, t0: t1 - t0
+
+
+async def delay_print(t, s):
+    await asyncio.sleep(t)
+    print(s)
+
+
+async def main():
+    print("start")
+
+    await asyncio.sleep(0.001)
+    print("after sleep")
+
+    t0 = ticks()
+    await delay_print(0.2, "short")
+    t1 = ticks()
+    await delay_print(0.4, "long")
+    t2 = ticks()
+    await delay_print(-1, "negative")
+    t3 = ticks()
+
+    print(
+        "took {} {} {}".format(
+            round(ticks_diff(t1, t0), -2),
+            round(ticks_diff(t2, t1), -2),
+            round(ticks_diff(t3, t2), -2),
+        )
+    )
+
+
+asyncio.run(main())