[docs] [issue18576] Rename and document test.script_helper as test.support.script_helper

[Nick Coghlan]

New submission from Nick Coghlan:

tests.script_helper provides various utilities for sensibly testing scripts in a subprocess. It isn't easy for CPython developers to discover, since it is isn't documented and the file is mixed in with actual tests in the main test directory.

As discussed in #15494, it should be:

1. Moved from Lib/test/ to Lib/test/support (and imports in tests adjusted accordingly)
2. Documented in Doc/library/test.rst

These changes should be made on both the 3.3 and default branches to avoid spurious merge conflicts.

----------
assignee: docs at python
components: Documentation, Tests
messages: 193819
nosy: docs at python, ncoghlan
priority: normal
severity: normal
status: open
title: Rename and document test.script_helper as test.support.script_helper
type: enhancement
versions: Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18576>
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