[fix] Fix picked versions tests in test_all.py

The general case is that buildout will pick versions for setuptools,
pip and wheel when they are not pinned: it's only when these are
installed as .egg-link - either as actual develop eggs or as a
side-effect of being found in .dist-info format in the environment
e.g. in site-packages - that buildout does not consider it picked
a version for these eggs.

This affects tests that set `allow-picked-versions = false` or
`show-picked-versions = true` or `update-versions-file = ...`.

src/zc/buildout/tests/test_all.py

@@ -566,6 +566,15 @@ We do not need to run in verbose mode for that to work:
     >>> make_dist_that_requires(sample_buildout, 'samplea', ['sampleb'])
     >>> make_dist_that_requires(sample_buildout, 'sampleb',
     ...                         ['sampley', 'samplea'])
+
+    >>> import pkg_resources
+    >>> req = pkg_resources.Requirement.parse('setuptools')
+    >>> setuptools_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('pip')
+    >>> pip_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('wheel')
+    >>> wheel_version = pkg_resources.working_set.find(req).version
+
     >>> write('buildout.cfg',
     ... '''
     ... [buildout]
@@ -577,7 +586,16 @@ We do not need to run in verbose mode for that to work:
     ... [eggs]
     ... recipe = zc.recipe.egg
     ... eggs = samplea
-    ... ''' % globals())
+    ...
+    ... [versions]
+    ... pip = %(pip)s
+    ... setuptools = %(setuptools)s
+    ... wheel = %(wheel)s
+    ... ''' % dict(
+    ...   globals(),
+    ...   pip=pip_version,
+    ...   setuptools=setuptools_version,
+    ...   wheel=wheel_version))
     >>> print_(system(buildout), end='') # doctest: +ELLIPSIS
     Develop: ...
     Versions had to be automatically picked.
@@ -2461,6 +2479,14 @@ preference for newer distributions.
 
 The default is prefer-final = true:
 
+    >>> import pkg_resources
+    >>> req = pkg_resources.Requirement.parse('setuptools')
+    >>> setuptools_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('pip')
+    >>> pip_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('wheel')
+    >>> wheel_version = pkg_resources.working_set.find(req).version
+
     >>> write('buildout.cfg',
     ... '''
     ... [buildout]
@@ -2471,7 +2497,16 @@ The default is prefer-final = true:
     ... [eggs]
     ... recipe = zc.recipe.egg:eggs
     ... eggs = demo
-    ... ''' % globals())
+    ...
+    ... [versions]
+    ... pip = %(pip)s
+    ... setuptools = %(setuptools)s
+    ... wheel = %(wheel)s
+    ... ''' % dict(
+    ...   globals(),
+    ...   pip=pip_version,
+    ...   setuptools=setuptools_version,
+    ...   wheel=wheel_version))
 
     >>> print_(system(buildout), end='') # doctest: +ELLIPSIS
     Installing ...
@@ -2501,7 +2536,16 @@ We get the same behavior if we add prefer-final = true
     ... [eggs]
     ... recipe = zc.recipe.egg:eggs
     ... eggs = demo
-    ... ''' % globals())
+    ...
+    ... [versions]
+    ... pip = %(pip)s
+    ... setuptools = %(setuptools)s
+    ... wheel = %(wheel)s
+    ... ''' % dict(
+    ...   globals(),
+    ...   pip=pip_version,
+    ...   setuptools=setuptools_version,
+    ...   wheel=wheel_version))
 
     >>> print_(system(buildout), end='') # doctest: +ELLIPSIS
     Updating ...
@@ -2531,7 +2575,16 @@ distributions:
     ... [eggs]
     ... recipe = zc.recipe.egg:eggs
     ... eggs = demo
-    ... ''' % globals())
+    ...
+    ... [versions]
+    ... pip = %(pip)s
+    ... setuptools = %(setuptools)s
+    ... wheel = %(wheel)s
+    ... ''' % dict(
+    ...   globals(),
+    ...   pip=pip_version,
+    ...   setuptools=setuptools_version,
+    ...   wheel=wheel_version))
 
     >>> print_(system(buildout), end='') # doctest: +ELLIPSIS
     Updating ...
@@ -2559,7 +2612,16 @@ We get an error if we specify anything but true or false:
     ... [eggs]
     ... recipe = zc.recipe.egg:eggs
     ... eggs = demo
-    ... ''' % globals())
+    ...
+    ... [versions]
+    ... pip = %(pip)s
+    ... setuptools = %(setuptools)s
+    ... wheel = %(wheel)s
+    ... ''' % dict(
+    ...   globals(),
+    ...   pip=pip_version,
+    ...   setuptools=setuptools_version,
+    ...   wheel=wheel_version))
 
     >>> print_(system(buildout+' -v'), end='') # doctest: +ELLIPSIS
     While:
@@ -3241,9 +3303,22 @@ def test_buildout_doesnt_keep_adding_itself_to_versions():
     ... update-versions-file = versions.cfg
     ... extends = versions.cfg
     ... ''')
+
+    >>> import pkg_resources
+    >>> req = pkg_resources.Requirement.parse('setuptools')
+    >>> setuptools_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('pip')
+    >>> pip_version = pkg_resources.working_set.find(req).version
+    >>> req = pkg_resources.Requirement.parse('wheel')
+    >>> wheel_version = pkg_resources.working_set.find(req).version
+
     >>> write('versions.cfg',
     ... '''[versions]
-    ... ''')
+    ... pip = %s
+    ... setuptools = %s
+    ... wheel = %s
+    ... ''' % (pip_version, setuptools_version, wheel_version))
+
     >>> _ = system(join('bin', 'buildout'))
     >>> with open('versions.cfg') as f:
     ...     versions = f.read()
@@ -3253,6 +3328,9 @@ def test_buildout_doesnt_keep_adding_itself_to_versions():
 
     >>> cat('versions.cfg') # doctest: +ELLIPSIS
     [versions]
+    pip = ...
+    setuptools = ...
+    wheel = ...
     >>> _ = system(join('bin', 'buildout'))
     >>> _ = system(join('bin', 'buildout'))