More detail error messages when parsing the out of tree json file

When run " lava-test register url" and "lava-test list-tests", it the json file is corrupt or missing, the lava-test only reports "Warning: Failed to load test from..". No hits on what is the root problem.

Tested with the url. http://git.linaro.org/gitweb?p=people/bgaignard/cmatest.git;a=blob_plain;f=cma.json;hb=dee9aaf928201b4f7efffe3e39b6cd4556a78314

From the chat :

<benjiG> zyga: same error "Warning: Failed to load test from 'http://git.linaro.org/gitweb?p=people/bgaignard/cmatest.git;a=blob_plain;f=cma.json;hb=HEAD'"
<zyga> let's see again then
<zyga> benjiG, in general you must be able to do this
<zyga> python
<zyga> import json
<zyga> json.load(open('yourfile.json'))
<zyga> if that crashes then you've got a syntax error
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<ChiThu> benjiG, testing..
<benjiG> zyga: got this error IOError: [Errno 2] No such file or directory: 'http://git.linaro.org/gitweb?p=people/bgaignard/cmatest.git;a=blob_plain;f=cma.json;hb=HEAD'
<zyga> still syntax ierror
<zyga> simplejson.decoder.JSONDecodeError: Invalid \escape: line 12 column 41 (char 338)
<zyga> benjiG, it seems you must quote your \w sequence
<zyga> as \\w
<zyga> try that
<zyga> yup
<zyga> that applies to all uses of \
<zyga> after doing that the file works
<zyga> :-)
<ChiThu> zyga, lava-test should print out the error messages from json parser. any tips how to do it ?
<zyga> ChiThu, er? I don't know what the problem is
<zyga> ChiThu, just use the parser and catch JSONDecodeError
<zyga> ChiThu, it's a subclass of ValueError
<zyga> ChiThu, also use simplejson, not json
<ChiThu> zyga, instead of "Warning: Failed to load test from...."
<zyga> ChiThu, sure, just do it :)
<ChiThu> zyga, more details error message..
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<ChiThu> zyga, ok catching the JSONDecodeError will do. Thanks for the tip
<zyga> ChiThu, it has a few extra attributes you can use to get the details