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authorDavid Robillard <d@drobilla.net>2018-09-11 20:54:08 +0200
committerDavid Robillard <d@drobilla.net>2018-09-11 20:54:08 +0200
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+#! /usr/bin/env python
+# 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)
+