tests/extmod/utime_time_ns.py: Relax bounds on time_ns measurement.

dpgeorge · dpgeorge · commit 35a6f6231e48 · 2021-02-01T18:44:28.000+11:00
Some devices have lower precision than 1ms for time_ns() (eg PYBv1.x has
3.9ms resolution of the RTC) so make the test more lenient for them.

Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/tests/extmod/utime_time_ns.py b/tests/extmod/utime_time_ns.py
@@ -11,14 +11,14 @@
 
 
 t0 = utime.time_ns()
-utime.sleep_us(1000)
+utime.sleep_us(5000)
 t1 = utime.time_ns()
 
 # Check that time_ns increases.
 print(t0 < t1)
 
-# Check that time_ns counts correctly, but be very lenient with the upper bound (50ms).
-if 950000 < t1 - t0 < 50000000:
+# Check that time_ns counts correctly, but be very lenient with the bounds (2ms to 50ms).
+if 2000000 < t1 - t0 < 50000000:
     print(True)
 else:
     print(t0, t1, t1 - t0)
