Implement real test.

For now it is done by using external networkcache server. Integration of
simulator is WIP.

src/zc/buildout/networkcache.txt

 Using buildout with cache over network
 ======================================
 
-Note: We are in process of preparing docs. This is only showcase.
+Networkcache in buildout is optional, and during normal run no information
+is shown:
+
+   >>> write(sample_buildout, 'buildout.cfg',
+   ... '''
+   ... [buildout]
+   ... parts =
+   ... ''')
+   >>> print system(buildout)
+
+But whenever networkcache configuration is enabled, it is possible to use it:
 
    >>> write(sample_buildout, 'buildout.cfg',
    ... '''
@@ -13,35 +23,40 @@ Note: We are in process of preparing docs. This is only showcase.
    ...
    ... [eggs]
    ... recipe = zc.recipe.egg:eggs
-   ... eggs = demo ==0.2
+   ... eggs = demoneeded ==1.2c1
    ...
    ... [networkcache]
-   ... download-cache-url = http://127.0.0.1:1/
-   ... download-dir-url = http://127.0.0.1:1/
-   ... upload-cache-url = http://127.0.0.1:1/
-   ... upload-dir-url = http://127.0.0.1:1/
+   ... download-cache-url = http://127.0.0.1:8000/shacache
+   ... download-dir-url = http://127.0.0.1:8000/shadir
+   ... upload-cache-url = http://127.0.0.1:8000/shacache
+   ... upload-dir-url = http://127.0.0.1:8000/shadir
    ... ''' % globals())
+   >>> print system(buildout)
+   Networkcache enabled.
+   Networkcache download cache: 'http://127.0.0.1:8000/shacache', directory 'http://127.0.0.1:8000/shadir'
+   Networkcache upload cache: 'http://127.0.0.1:8000/shacache', directory 'http://127.0.0.1:8000/shadir'
+   Installing eggs.
+   Getting distribution for 'demoneeded==1.2c1'.
+   Downloading demoneeded-1.2c1.zip from network cache.
+   Failed to download from network cache demoneeded-1.2c1.zip: 
+   Uploading http://localhost:28922/demoneeded-1.2c1.zip into network cache.
+   Got demoneeded 1.2c1.
+   <BLANKLINE>
+
+Now lets clean up buildout directory:
 
-   >>> from glob import glob
-   >>> from os.path import join
-   >>> for egg in glob(join(sample_buildout, 'eggs', 'demoneeded*.egg')):
-   ...     remove(sample_buildout, 'eggs', egg)
+   >>> import os, glob
+   >>> [remove(q) for q in glob.glob(os.path.join(sample_buildout, 'eggs', 'demoneeded*'))]
+   [None]
+   >>> remove('.installed.cfg')
 
+And run it again, data will be downloaded from networkcache:
    >>> print system(buildout)
    Networkcache enabled.
-   Networkcache download cache: 'http://127.0.0.1:1/', directory 'http://127.0.0.1:1/'
-   Networkcache upload cache: 'http://127.0.0.1:1/', directory 'http://127.0.0.1:1/'
+   Networkcache download cache: 'http://127.0.0.1:8000/shacache', directory 'http://127.0.0.1:8000/shadir'
+   Networkcache upload cache: 'http://127.0.0.1:8000/shacache', directory 'http://127.0.0.1:8000/shadir'
    Installing eggs.
-   Getting distribution for 'demo==0.2'.
-   Downloading demo-0.2-py2.7.egg from network cache.
-   Failed to download from network cache demo-0.2-py2.7.egg: [Errno 111] Connection refused
-   Uploading http://localhost/demo-0.2-py2.7.egg into network cache.
-   Fail to upload file. [Errno 111] Connection refused
-   Got demo 0.2.
-   Getting distribution for 'demoneeded'.
+   Getting distribution for 'demoneeded==1.2c1'.
    Downloading demoneeded-1.2c1.zip from network cache.
-   Failed to download from network cache demoneeded-1.2c1.zip: [Errno 111] Connection refused
-   Uploading http://localhost/demoneeded-1.2c1.zip into network cache.
-   Fail to upload file. [Errno 111] Connection refused
    Got demoneeded 1.2c1.
    <BLANKLINE>