ZODB: Add testing support

Organize testing of ZODB 3/4/5 on Nexedi testing infrastructure.

ZODB is core component that we rely on everywhere, and given that this days
upstream is not very active, and we are going to add our own patches to ZODB,
we should add automatic testing to make sure that our ZODB is in good shape.

component/ZODB/test-common.cfg

+# SlapOS software release to test ZODB on Nexedi testing infrastructure.
+# Common parts.
+
+[buildout]
+extends =
+# test<X>.cfg configures ZODB.major=<X>.
+
+    ../../stack/nxdtest.cfg
+    ../pygolang/buildout.cfg
+    ../python-manuel/buildout.cfg
+    buildout-dev.cfg
+    ../ZEO/buildout.cfg
+
+parts =
+    ZODB
+    .nxdtest
+
+#   for instance
+    ZODB-python
+    slapos-cookbook
+    instance.cfg
+
+
+# test-dependent eggs that must come through in-tree recipes.
+[ZODB]
+depends += ${manuel:egg}
+
+
+# bin/python is preinstalled with sys.path to ZODB & friends.
+[ZODB-python]
+<= python-interpreter
+eggs +=
+  ${ZODB:egg}[test]
+  ${ZEO:egg}[test]
+  transaction[test]
+
+# env.sh for ZODB's python to be on $PATH.
+[ZODB-env.sh]
+recipe   = slapos.recipe.template:jinja2
+rendered = ${buildout:directory}/${:_buildout_section_name_}
+template = inline:
+  export PS1="(ZODB-env) $PS1"
+  export PATH=${buildout:bin-directory}:$PATH
+
+# .nxdtest to run ZODB tests
+[.nxdtest]
+<= jinja2-template
+template = inline:
+  # determine where ZODB & friends were installed
+  from subprocess import check_output
+  _ = check_output(['python', '-c',
+                    'from os.path import dirname\n'+
+                    'def X(mod): m=__import__(mod); print(dirname(m.__file__))\n\n'+
+                    'X("ZODB"); X("persistent"); X("BTrees"); X("transaction"), X("ZEO")'])
+  ZODB, persistent, BTrees, transaction, ZEO = _.split()
+
+  # run tests for whole ZODB stack
+  TestCase('ZODB/unit',       ['python', '-m', 'zope.testrunner', '-uv', '--package-path', ZODB, 'ZODB'])
+  TestCase('ZODB/functional', ['python', '-m', 'zope.testrunner', '-fv', '--package-path', ZODB, 'ZODB'])
+
+  TestCase('ZEO/unit',       ['python', '-m', 'zope.testrunner', '-uv', '--package-path', ZEO, 'ZEO'])
+  TestCase('ZEO/functional', ['python', '-m', 'zope.testrunner', '-fv', '--package-path', ZEO, 'ZEO'])
+
+  TestCase('persistent', ['python', '-m', 'zope.testrunner', '-v', '--package-path', persistent, 'persistent'])
+  TestCase('BTrees',     ['python', '-m', 'zope.testrunner', '-v', '--package-path', BTrees, 'BTrees'])
+
+  # transaction uses unittest instead of zope.testrunner
+  import os.path
+  def P(path): return os.path.join(path, '..')
+  TestCase('transaction',['python', '-m', 'unittest', 'discover', '-s', P(transaction)])
+
+
+# instance to run nxdtest.
+[instance.cfg]
+<= jinja2-template
+template = inline:
+  [buildout]
+  extends = ${nxdtest-instance.cfg:rendered}
+
+  [runTestSuite]
+  env.sh  = ${ZODB-env.sh:rendered}
+  workdir = ${buildout:directory}

component/ZODB/test-zodb3.cfg

+# SlapOS software release to test ZODB3 on Nexedi testing infrastructure.
+
+[buildout]
+extends = test-common.cfg
+
+[ZODB]
+major = 3

component/ZODB/test-zodb5.cfg

+# SlapOS software release to test ZODB5 on Nexedi testing infrastructure.
+
+[buildout]
+extends = test-common.cfg
+
+[ZODB]
+major = 5
+
+
+# NOTE with default zope.testing=3.9.7 it fails with
+#    setupstack.TestCase -> AttributeError: 'module' object has no attribute 'TestCase'
+[versions]
+zope.testing = 4.7

component/ZODB/test.cfg

+# SlapOS software release to test ZODB on Nexedi testing infrastructure.
+
+[buildout]
+extends = test-common.cfg
+
+[ZODB]
+major = 4