simplekml chooses feature ids using global state

[GoogleCodeExporter]

simplekml maintains global state between successive calls.

This makes it difficult to test a process that uses simplekml to generate 
multiple kml files, as the content of each kml file depends upon which kml 
files were previously generated.

This global state is stored in the _id variable of the Feature class.
(visible in featfeom.py at latest revision at time of writing: 
9f7f6912e183db7f7829cb5aea0c1595fea1cdf6)


A small demonstration of this behaviour is provided in test_simplekml.py (see 
attached).

To replicate:

py.test test_simple.py

Expected behaviour: test passes

observed behaviour:

py.test test_simplekml.py
================================================= test session starts 
===============
platform win32 -- Python 2.7.3 -- pytest-2.3.5
plugins: cov, xdist
collected 1 items

test_simplekml.py F

====================================================== FAILURES 
=====================
___________________________________________________ test_invariance 
_________________

    def test_invariance():
>       assert make_trivial_kml() == make_trivial_kml()
E    assert u'<?xml versi...nt>\n</kml>\n' == u'<?xml versio...nt>\n</kml>\n'
E      Skipping 142 identical leading characters in diff, use -v to show
E      Skipping 46 identical trailing characters in diff, use -v to show
E      -  id="feat_1">
E      ?           ^
E      +  id="feat_2">
E      ?           ^

test_simplekml.py:8: AssertionError
============================================== 1 failed in 0.07 seconds 
=============

Original issue reported on code.google.com by reuben.f...@biarri.com on 29 Jul 2013 at 5:37

Attachments:

• test_simplekml.py

[endolith]

resetidcounter resets it for Points, but not for the document ID?