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