[Piglit] [PATCH 0/4] Add support for subtests in JUnit as nested testsuite elements

[Dylan Baker]

This series refactors the JUnit backend so that the _write attribute is
actually a callable class, instead of a method. This gives greater
flexibility to handle subtests in the JUnit, or continue ignoring them.

The reason to ignore them is that some xUnit implementations don't
handle them properly (the JUnit plugin for Jenkins does not, for
example, while the xUnit plugin does). Since piglit has a more than one
consumer of the JUnit backend, it makes sense to be able to select the
new backend or not.

To enable this features add the --junit-subtests switch to the command
line (obviously when using the junit backned), and watch magic happen.
Each test with subtests will be recorded as a testsuite element, and the
stderr and stdout will be attached to the testsuite rather than the
testcase. However, when using the xUnit plugin for Jenkins it is
rendered correctly.

Jose, Could you test the subtest mode and see if it's a viable path for
you? If possible I'd like to lower the complexity of the code by just
removing the non-subtest path, but if that's going to be too much work
for you we'll leave it as-is.

I've tested this on our Jenkins instance and it renders correctly.

CC: jfonseca at vmware.com
CC: mark.a.janes at intel.com 

Dylan Baker (4):
  framework/backends/junit.py: Split _write into a separate class.
  framework/backends/junit.py: Split _set_xml_err method
  framework/backends/junit.py: Add a writer class that handles subtests
  framework: add command line switch to enable junit subtests

 framework/backends/junit.py                | 348 ++++++++++++++--------
 framework/programs/run.py                  |   7 +-
 unittests/framework/backends/test_junit.py | 124 +++++++-
 3 files changed, 341 insertions(+), 138 deletions(-)

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