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#! /usr/bin/env python3
# encoding: utf-8
# Calle Rosenquist, 2016-2018 (xbreak)
"""
Provides Python unit test support using :py:class:`waflib.Tools.waf_unit_test.utest`
task via the **pytest** feature.
To use pytest the following is needed:
1. Load `pytest` and the dependency `waf_unit_test` tools.
2. Create a task generator with feature `pytest` (not `test`) and customize behaviour with
the following attributes:
- `pytest_source`: Test input files.
- `ut_str`: Test runner command, e.g. ``${PYTHON} -B -m unittest discover`` or
if nose is used: ``${NOSETESTS} --no-byte-compile ${SRC}``.
- `ut_shell`: Determines if ``ut_str`` is executed in a shell. Default: False.
- `ut_cwd`: Working directory for test runner. Defaults to directory of
first ``pytest_source`` file.
Additionally the following `pytest` specific attributes are used in dependent taskgens:
- `pytest_path`: Node or string list of additional Python paths.
- `pytest_libpath`: Node or string list of additional library paths.
The `use` dependencies are used for both update calculation and to populate
the following environment variables for the `pytest` test runner:
1. `PYTHONPATH` (`sys.path`) of any dependent taskgen that has the feature `py`:
- `install_from` attribute is used to determine where the root of the Python sources
are located. If `install_from` is not specified the default is to use the taskgen path
as the root.
- `pytest_path` attribute is used to manually specify additional Python paths.
2. Dynamic linker search path variable (e.g. `LD_LIBRARY_PATH`) of any dependent taskgen with
non-static link_task.
- `pytest_libpath` attribute is used to manually specify additional linker paths.
Note: `pytest` cannot automatically determine the correct `PYTHONPATH` for `pyext` taskgens
because the extension might be part of a Python package or used standalone:
- When used as part of another `py` package, the `PYTHONPATH` is provided by
that taskgen so no additional action is required.
- When used as a standalone module, the user needs to specify the `PYTHONPATH` explicitly
via the `pytest_path` attribute on the `pyext` taskgen.
For details c.f. the pytest playground examples.
For example::
# A standalone Python C extension that demonstrates unit test environment population
# of PYTHONPATH and LD_LIBRARY_PATH/PATH/DYLD_LIBRARY_PATH.
#
# Note: `pytest_path` is provided here because pytest cannot automatically determine
# if the extension is part of another Python package or is used standalone.
bld(name = 'foo_ext',
features = 'c cshlib pyext',
source = 'src/foo_ext.c',
target = 'foo_ext',
pytest_path = [ bld.path.get_bld() ])
# Python package under test that also depend on the Python module `foo_ext`
#
# Note: `install_from` is added automatically to `PYTHONPATH`.
bld(name = 'foo',
features = 'py',
use = 'foo_ext',
source = bld.path.ant_glob('src/foo/*.py'),
install_from = 'src')
# Unit test example using the built in module unittest and let that discover
# any test cases.
bld(name = 'foo_test',
features = 'pytest',
use = 'foo',
pytest_source = bld.path.ant_glob('test/*.py'),
ut_str = '${PYTHON} -B -m unittest discover')
"""
import os
from waflib import Task, TaskGen, Errors, Utils, Logs
from waflib.Tools import ccroot
def _process_use_rec(self, name):
"""
Recursively process ``use`` for task generator with name ``name``..
Used by pytest_process_use.
"""
if name in self.pytest_use_not or name in self.pytest_use_seen:
return
try:
tg = self.bld.get_tgen_by_name(name)
except Errors.WafError:
self.pytest_use_not.add(name)
return
self.pytest_use_seen.append(name)
tg.post()
for n in self.to_list(getattr(tg, 'use', [])):
_process_use_rec(self, n)
@TaskGen.feature('pytest')
@TaskGen.after_method('process_source', 'apply_link')
def pytest_process_use(self):
"""
Process the ``use`` attribute which contains a list of task generator names and store
paths that later is used to populate the unit test runtime environment.
"""
self.pytest_use_not = set()
self.pytest_use_seen = []
self.pytest_paths = [] # strings or Nodes
self.pytest_libpaths = [] # strings or Nodes
self.pytest_dep_nodes = []
names = self.to_list(getattr(self, 'use', []))
for name in names:
_process_use_rec(self, name)
def extend_unique(lst, varlst):
ext = []
for x in varlst:
if x not in lst:
ext.append(x)
lst.extend(ext)
# Collect type specific info needed to construct a valid runtime environment
# for the test.
for name in self.pytest_use_seen:
tg = self.bld.get_tgen_by_name(name)
extend_unique(self.pytest_paths, Utils.to_list(getattr(tg, 'pytest_path', [])))
extend_unique(self.pytest_libpaths, Utils.to_list(getattr(tg, 'pytest_libpath', [])))
if 'py' in tg.features:
# Python dependencies are added to PYTHONPATH
pypath = getattr(tg, 'install_from', tg.path)
if 'buildcopy' in tg.features:
# Since buildcopy is used we assume that PYTHONPATH in build should be used,
# not source
extend_unique(self.pytest_paths, [pypath.get_bld().abspath()])
# Add buildcopy output nodes to dependencies
extend_unique(self.pytest_dep_nodes, [o for task in getattr(tg, 'tasks', []) \
for o in getattr(task, 'outputs', [])])
else:
# If buildcopy is not used, depend on sources instead
extend_unique(self.pytest_dep_nodes, tg.source)
extend_unique(self.pytest_paths, [pypath.abspath()])
if getattr(tg, 'link_task', None):
# For tasks with a link_task (C, C++, D et.c.) include their library paths:
if not isinstance(tg.link_task, ccroot.stlink_task):
extend_unique(self.pytest_dep_nodes, tg.link_task.outputs)
extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH)
if 'pyext' in tg.features:
# If the taskgen is extending Python we also want to add the interpreter libpath.
extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH_PYEXT)
else:
# Only add to libpath if the link task is not a Python extension
extend_unique(self.pytest_libpaths, [tg.link_task.outputs[0].parent.abspath()])
@TaskGen.feature('pytest')
@TaskGen.after_method('pytest_process_use')
def make_pytest(self):
"""
Creates a ``utest`` task with a populated environment for Python if not specified in ``ut_env``:
- Paths in `pytest_paths` attribute are used to populate PYTHONPATH
- Paths in `pytest_libpaths` attribute are used to populate the system library path (e.g. LD_LIBRARY_PATH)
"""
nodes = self.to_nodes(self.pytest_source)
tsk = self.create_task('utest', nodes)
tsk.dep_nodes.extend(self.pytest_dep_nodes)
if getattr(self, 'ut_str', None):
self.ut_run, lst = Task.compile_fun(self.ut_str, shell=getattr(self, 'ut_shell', False))
tsk.vars = lst + tsk.vars
if getattr(self, 'ut_cwd', None):
if isinstance(self.ut_cwd, str):
# we want a Node instance
if os.path.isabs(self.ut_cwd):
self.ut_cwd = self.bld.root.make_node(self.ut_cwd)
else:
self.ut_cwd = self.path.make_node(self.ut_cwd)
else:
if tsk.inputs:
self.ut_cwd = tsk.inputs[0].parent
else:
raise Errors.WafError("no valid input files for pytest task, check pytest_source value")
if not self.ut_cwd.exists():
self.ut_cwd.mkdir()
if not hasattr(self, 'ut_env'):
self.ut_env = dict(os.environ)
def add_paths(var, lst):
# Add list of paths to a variable, lst can contain strings or nodes
lst = [ str(n) for n in lst ]
Logs.debug("ut: %s: Adding paths %s=%s", self, var, lst)
self.ut_env[var] = os.pathsep.join(lst) + os.pathsep + self.ut_env.get(var, '')
# Prepend dependency paths to PYTHONPATH and LD_LIBRARY_PATH
add_paths('PYTHONPATH', self.pytest_paths)
if Utils.is_win32:
add_paths('PATH', self.pytest_libpaths)
elif Utils.unversioned_sys_platform() == 'darwin':
add_paths('DYLD_LIBRARY_PATH', self.pytest_libpaths)
add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
else:
add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
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