[U-Boot] [PATCH 3/8] test/py: drain console log at the end of any failed test
Stephen Warren
swarren at wwwdotorg.org
Wed Jan 20 23:15:53 CET 2016
From: Stephen Warren <swarren at nvidia.com>
Tests may fail for a number of reasons, and in particular for reasons
other than a timeout waiting for U-Boot to print expected data. If the
last operation that a failed test performs is not waiting for U-Boot to
print something, then any trailing output from U-Boot during that test's
operation will not be logged as part of that test, but rather either
along with the next test, or even thrown away, potentiall hiding clues
re: the test failure reason.
Solve this by explicitly draining (and hence logging) the U-Boot output
in the case of failed tests.
Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
test/py/conftest.py | 1 +
test/py/u_boot_console_base.py | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/test/py/conftest.py b/test/py/conftest.py
index 38aa3f922a86..c1f19cee65a3 100644
--- a/test/py/conftest.py
+++ b/test/py/conftest.py
@@ -386,6 +386,7 @@ def pytest_runtest_protocol(item, nextitem):
skipped = report
if failed:
+ console.drain_console()
tests_failed.add(item.name)
elif skipped:
tests_skipped.add(item.name)
diff --git a/test/py/u_boot_console_base.py b/test/py/u_boot_console_base.py
index 10fe3dbdd372..418a26bb8e40 100644
--- a/test/py/u_boot_console_base.py
+++ b/test/py/u_boot_console_base.py
@@ -14,6 +14,7 @@ import os
import pytest
import re
import sys
+import u_boot_spawn
# Regexes for text we expect U-Boot to send to the console.
pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}-[^\r\n]*)')
@@ -213,6 +214,43 @@ class ConsoleBase(object):
self.run_command(chr(3), wait_for_echo=False, send_nl=False)
+ def drain_console(self):
+ '''Read from and log the U-Boot console for a short time.
+
+ U-Boot's console output is only logged when the test code actively
+ waits for U-Boot to emit specific data. There are cases where tests
+ can fail without doing this. For example, if a test asks U-Boot to
+ enable USB device mode, then polls until a host-side device node
+ exists. In such a case, it is useful to log U-Boot's console output
+ in case U-Boot printed clues as to why the host-side even did not
+ occur. This function will do that.
+
+ Args:
+ None.
+
+ Returns:
+ Nothing.
+ '''
+
+ # If we are already not connected to U-Boot, there's nothing to drain.
+ # This should only happen when a previous call to run_command() or
+ # wait_for() failed (and hence the output has already been logged), or
+ # the system is shutting down.
+ if not self.p:
+ return
+
+ orig_timeout = self.p.timeout
+ try:
+ # Drain the log for a relatively short time.
+ self.p.timeout = 1000
+ # Wait for something U-Boot will likely never send. This will
+ # cause the console output to be read and logged.
+ self.p.expect(['This should never match U-Boot output'])
+ except u_boot_spawn.Timeout:
+ pass
+ finally:
+ self.p.timeout = orig_timeout
+
def ensure_spawned(self):
'''Ensure a connection to a correctly running U-Boot instance.
--
2.7.0
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