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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Facilities for helping test code which interacts with L{twisted.python.modules},
or uses Python's own module system to load code.
"""
import sys
from twisted.trial.unittest import TestCase
from twisted.python import modules
from twisted.python.filepath import FilePath
class TwistedModulesTestCase(TestCase):
def findByIteration(self, modname, where=modules, importPackages=False):
"""
You don't ever actually want to do this, so it's not in the public API, but
sometimes we want to compare the result of an iterative call with a
lookup call and make sure they're the same for test purposes.
"""
for modinfo in where.walkModules(importPackages=importPackages):
if modinfo.name == modname:
return modinfo
self.fail("Unable to find module %r through iteration." % (modname,))
def replaceSysPath(self, sysPath):
"""
Replace sys.path, for the duration of the test, with the given value.
"""
originalSysPath = sys.path[:]
def cleanUpSysPath():
sys.path[:] = originalSysPath
self.addCleanup(cleanUpSysPath)
sys.path[:] = sysPath
def replaceSysModules(self, sysModules):
"""
Replace sys.modules, for the duration of the test, with the given value.
"""
originalSysModules = sys.modules.copy()
def cleanUpSysModules():
sys.modules.clear()
sys.modules.update(originalSysModules)
self.addCleanup(cleanUpSysModules)
sys.modules.clear()
sys.modules.update(sysModules)
def pathEntryWithOnePackage(self, pkgname="test_package"):
"""
Generate a L{FilePath} with one package, named C{pkgname}, on it, and
return the L{FilePath} of the path entry.
"""
entry = FilePath(self.mktemp())
pkg = entry.child("test_package")
pkg.makedirs()
pkg.child("__init__.py").setContent("")
return entry
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