Running Without Source Code

The --usecompiled option allows running tests in a tree without .py source code, provided compiled .pyc or .pyo files exist (without --usecompiled, .py files are necessary).

We have a very simple directory tree, under usecompiled/, to test this. Because we’re going to delete its .py files, we want to work in a copy of that:

>>> import os.path, shutil, sys, tempfile
>>> directory_with_tests = tempfile.mkdtemp()
>>> NEWNAME = "unlikely_package_name"
>>> src = os.path.join(this_directory, 'testrunner-ex', 'usecompiled')
>>> os.path.isdir(src)
True
>>> dst = os.path.join(directory_with_tests, NEWNAME)
>>> os.path.isdir(dst)
False

Have to use our own copying code, to avoid copying read-only SVN files that can’t be deleted later.

>>> n = len(src) + 1
>>> for root, dirs, files in os.walk(src):
...     dirs[:] = [d for d in dirs if d == "package"] # prune cruft
...     os.mkdir(os.path.join(dst, root[n:]))
...     for f in files:
...         _ = shutil.copy(os.path.join(root, f),
...                         os.path.join(dst, root[n:], f))

Now run the tests in the copy:

>>> from zope import testrunner
>>> mydefaults = [
...     '--path', directory_with_tests,
...     '--tests-pattern', '^compiletest$',
...     '--package', NEWNAME,
...     '-vv',
...     ]
>>> sys.argv = ['test']
>>> testrunner.run_internal(mydefaults)
Running tests at level 1
Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
  Running:
 test1 (unlikely_package_name.compiletest.Test)
 test2 (unlikely_package_name.compiletest.Test)
 test1 (unlikely_package_name.package.compiletest.Test)
 test2 (unlikely_package_name.package.compiletest.Test)
  Ran 4 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
Tearing down left over layers:
  Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
False

If we delete the source files, it’s normally a disaster: the test runner doesn’t believe any test files, or even packages, exist. Note that we pass --keepbytecode this time, because otherwise the test runner would delete the compiled Python files too:

>>> for root, dirs, files in os.walk(dst):
...    for f in files:
...        if f.endswith(".py"):
...            os.remove(os.path.join(root, f))
>>> testrunner.run_internal(mydefaults, ["test", "--keepbytecode"])
Running tests at level 1
Total: 0 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
False

Finally, passing --usecompiled asks the test runner to treat .pyc and .pyo files as adequate replacements for .py files. Note that the output is the same as when running with .py source above. The absence of “removing stale bytecode …” messages shows that --usecompiled also implies --keepbytecode:

>>> if sys.version_info >= (3, 2):
...     # PEP-3147: pyc files in __pycache__ directories cannot be
...     # imported; legacy source-less imports need to use the legacy
...     # layout
...     for root, dirs, files in os.walk(dst):
...         for f in files:
...             if f.endswith((".pyc", ".pyo")):
...                 # "root/f" is "dirname/__pycache__/name.magic.ext"
...                 dirname = os.path.dirname(os.path.abspath(root))
...                 namewmagic, ext = os.path.splitext(os.path.basename(f))
...                 newname = os.path.splitext(namewmagic)[0] + ext
...                 os.rename(os.path.join(root, f),
...                           os.path.join(dirname, newname))
>>> testrunner.run_internal(mydefaults, ["test", "--usecompiled"])
Running tests at level 1
Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
  Running:
 test1 (unlikely_package_name.compiletest.Test)
 test2 (unlikely_package_name.compiletest.Test)
 test1 (unlikely_package_name.package.compiletest.Test)
 test2 (unlikely_package_name.package.compiletest.Test)
  Ran 4 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
Tearing down left over layers:
  Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
False

Remove the temporary directory:

>>> shutil.rmtree(directory_with_tests)