[U-Boot] [U-Boot, 09/14] test/py: Provide a way to check that a command fails

[Tom Rini]

On Sun, Jul 03, 2016 at 09:40:41AM -0600, Simon Glass wrote:

> Sometimes we want to run a command and check that it fails. Add a function
> to handle this. It can check the return code and also make sure that the
> output contains a given error message.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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