[PATCH] test_sleep.py: make sleep time and margin configurable

[Heiko Schocher <hs@denx.de>]

make the sleep time and the margin configurable.

Signed-off-by: Heiko Schocher <hs@denx.de>
---

travis build:
https://travis-ci.org/github/hsdenx/u-boot-test/builds/694545225

This patch is needed as I start test/py now within tbot [1]. On
some configurations U-Boot is compiled on a build machine for
example in munich, while the board under test is in my lab in
hungary.

So the 0.25 seconds default margin is often to low because
of latencies on the net.

See as an example configuration (within tbot):

https://github.com/EmbLux-Kft/tbot-tbot2go/blob/devel/boards/aristainetos.py#L29

[1] http://tbot.tools/modules/tc.html#u-boot-test-py

 test/py/tests/test_sleep.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/test/py/tests/test_sleep.py b/test/py/tests/test_sleep.py
index b69edf26ef..392af29db2 100644
--- a/test/py/tests/test_sleep.py
+++ b/test/py/tests/test_sleep.py
@@ -11,6 +11,12 @@ change test behavior.
 # Setup env__sleep_accurate to False if time is not accurate on your platform
 env__sleep_accurate = False
 
+# Setup env__sleep_time time in seconds board is set to sleep
+env__sleep_time = 3
+
+# Setup env__sleep_margin set a margin for any system overhead
+env__sleep_margin = 0.25
+
 """
 
 def test_sleep(u_boot_console):
@@ -23,13 +29,15 @@ def test_sleep(u_boot_console):
 
     if u_boot_console.config.buildconfig.get('config_cmd_misc', 'n') != 'y':
         pytest.skip('sleep command not supported')
+
     # 3s isn't too long, but is enough to cross a few second boundaries.
-    sleep_time = 3
+    sleep_time = u_boot_console.config.env.get('env__sleep_time', 3)
+    sleep_margin = u_boot_console.config.env.get('env__sleep_margin', 0.25)
     tstart = time.time()
     u_boot_console.run_command('sleep %d' % sleep_time)
     tend = time.time()
     elapsed = tend - tstart
     assert elapsed >= (sleep_time - 0.01)
     if not u_boot_console.config.gdbserver:
-        # 0.25s margin is hopefully enough to account for any system overhead.
-        assert elapsed < (sleep_time + 0.25)
+        # margin is hopefully enough to account for any system overhead.
+        assert elapsed < (sleep_time + sleep_margin)
-- 
2.24.1