Edit: cover.py
"""If you have Ned Batchelder's coverage_ module installed, you may activate a coverage report with the ``--with-coverage`` switch or NOSE_WITH_COVERAGE environment variable. The coverage report will cover any python source module imported after the start of the test run, excluding modules that match testMatch. If you want to include those modules too, use the ``--cover-tests`` switch, or set the NOSE_COVER_TESTS environment variable to a true value. To restrict the coverage report to modules from a particular package or packages, use the ``--cover-package`` switch or the NOSE_COVER_PACKAGE environment variable. .. _coverage: http://www.nedbatchelder.com/code/modules/coverage.html """ import logging import re import sys import io from nose.plugins.base import Plugin from nose.util import src, tolist log = logging.getLogger(__name__) class Coverage(Plugin): """ Activate a coverage report using Ned Batchelder's coverage module. """ coverTests = False coverPackages = None coverInstance = None coverErase = False coverMinPercentage = None score = 200 status = {} def options(self, parser, env): """ Add options to command line. """ super(Coverage, self).options(parser, env) parser.add_option("--cover-package", action="append", default=env.get('NOSE_COVER_PACKAGE'), metavar="PACKAGE", dest="cover_packages", help="Restrict coverage output to selected packages " "[NOSE_COVER_PACKAGE]") parser.add_option("--cover-erase", action="store_true", default=env.get('NOSE_COVER_ERASE'), dest="cover_erase", help="Erase previously collected coverage " "statistics before run") parser.add_option("--cover-tests", action="store_true", dest="cover_tests", default=env.get('NOSE_COVER_TESTS'), help="Include test modules in coverage report " "[NOSE_COVER_TESTS]") parser.add_option("--cover-min-percentage", action="store", dest="cover_min_percentage", default=env.get('NOSE_COVER_MIN_PERCENTAGE'), help="Minimum percentage of coverage for tests " "to pass [NOSE_COVER_MIN_PERCENTAGE]") parser.add_option("--cover-inclusive", action="store_true", dest="cover_inclusive", default=env.get('NOSE_COVER_INCLUSIVE'), help="Include all python files under working " "directory in coverage report. Useful for " "discovering holes in test coverage if not all " "files are imported by the test suite. " "[NOSE_COVER_INCLUSIVE]") parser.add_option("--cover-html", action="store_true", default=env.get('NOSE_COVER_HTML'), dest='cover_html', help="Produce HTML coverage information") parser.add_option('--cover-html-dir', action='store', default=env.get('NOSE_COVER_HTML_DIR', 'cover'), dest='cover_html_dir', metavar='DIR', help='Produce HTML coverage information in dir') parser.add_option("--cover-branches", action="store_true", default=env.get('NOSE_COVER_BRANCHES'), dest="cover_branches", help="Include branch coverage in coverage report " "[NOSE_COVER_BRANCHES]") parser.add_option("--cover-xml", action="store_true", default=env.get('NOSE_COVER_XML'), dest="cover_xml", help="Produce XML coverage information") parser.add_option("--cover-xml-file", action="store", default=env.get('NOSE_COVER_XML_FILE', 'coverage.xml'), dest="cover_xml_file", metavar="FILE", help="Produce XML coverage information in file") def configure(self, options, conf): """ Configure plugin. """ try: self.status.pop('active') except KeyError: pass super(Coverage, self).configure(options, conf) if self.enabled: try: import coverage if not hasattr(coverage, 'coverage'): raise ImportError("Unable to import coverage module") except ImportError: log.error("Coverage not available: " "unable to import coverage module") self.enabled = False return self.conf = conf self.coverErase = options.cover_erase self.coverTests = options.cover_tests self.coverPackages = [] if options.cover_packages: if isinstance(options.cover_packages, (list, tuple)): cover_packages = options.cover_packages else: cover_packages = [options.cover_packages] for pkgs in [tolist(x) for x in cover_packages]: self.coverPackages.extend(pkgs) self.coverInclusive = options.cover_inclusive if self.coverPackages: log.info("Coverage report will include only packages: %s", self.coverPackages) self.coverHtmlDir = None if options.cover_html: self.coverHtmlDir = options.cover_html_dir log.debug('Will put HTML coverage report in %s', self.coverHtmlDir) self.coverBranches = options.cover_branches self.coverXmlFile = None if options.cover_min_percentage: self.coverMinPercentage = int(options.cover_min_percentage.rstrip('%')) if options.cover_xml: self.coverXmlFile = options.cover_xml_file log.debug('Will put XML coverage report in %s', self.coverXmlFile) if self.enabled: self.status['active'] = True self.coverInstance = coverage.coverage(auto_data=False, branch=self.coverBranches, data_suffix=conf.worker, source=self.coverPackages) self.coverInstance._warn_no_data = False self.coverInstance.is_worker = conf.worker self.coverInstance.exclude('#pragma[: ]+[nN][oO] [cC][oO][vV][eE][rR]') log.debug("Coverage begin") self.skipModules = list(sys.modules.keys())[:] if self.coverErase: log.debug("Clearing previously collected coverage statistics") self.coverInstance.combine() self.coverInstance.erase() if not self.coverInstance.is_worker: self.coverInstance.load() self.coverInstance.start() def beforeTest(self, *args, **kwargs): """ Begin recording coverage information. """ if self.coverInstance.is_worker: self.coverInstance.load() self.coverInstance.start() def afterTest(self, *args, **kwargs): """ Stop recording coverage information. """ if self.coverInstance.is_worker: self.coverInstance.stop() self.coverInstance.save() def report(self, stream): """ Output code coverage report. """ log.debug("Coverage report") self.coverInstance.stop() self.coverInstance.combine() self.coverInstance.save() modules = [module for name, module in list(sys.modules.items()) if self.wantModuleCoverage(name, module)] log.debug("Coverage report will cover modules: %s", modules) self.coverInstance.report(modules, file=stream) import coverage if self.coverHtmlDir: log.debug("Generating HTML coverage report") try: self.coverInstance.html_report(modules, self.coverHtmlDir) except coverage.misc.CoverageException as e: log.warning("Failed to generate HTML report: %s" % str(e)) if self.coverXmlFile: log.debug("Generating XML coverage report") try: self.coverInstance.xml_report(modules, self.coverXmlFile) except coverage.misc.CoverageException as e: log.warning("Failed to generate XML report: %s" % str(e)) # make sure we have minimum required coverage if self.coverMinPercentage: f = io.StringIO() self.coverInstance.report(modules, file=f) multiPackageRe = (r'-------\s\w+\s+\d+\s+\d+(?:\s+\d+\s+\d+)?' r'\s+(\d+)%\s+\d*\s{0,1}$') singlePackageRe = (r'-------\s[\w./]+\s+\d+\s+\d+(?:\s+\d+\s+\d+)?' r'\s+(\d+)%(?:\s+[-\d, ]+)\s{0,1}$') m = re.search(multiPackageRe, f.getvalue()) if m is None: m = re.search(singlePackageRe, f.getvalue()) if m: percentage = int(m.groups()[0]) if percentage < self.coverMinPercentage: log.error('TOTAL Coverage did not reach minimum ' 'required: %d%%' % self.coverMinPercentage) sys.exit(1) else: log.error("No total percentage was found in coverage output, " "something went wrong.") def wantModuleCoverage(self, name, module): if not hasattr(module, '__file__'): log.debug("no coverage of %s: no __file__", name) return False module_file = src(module.__file__) if not module_file or not module_file.endswith('.py'): log.debug("no coverage of %s: not a python file", name) return False if self.coverPackages: for package in self.coverPackages: if (re.findall(r'^%s\b' % re.escape(package), name) and (self.coverTests or not self.conf.testMatch.search(name))): log.debug("coverage for %s", name) return True if name in self.skipModules: log.debug("no coverage for %s: loaded before coverage start", name) return False if self.conf.testMatch.search(name) and not self.coverTests: log.debug("no coverage for %s: is a test", name) return False # accept any package that passed the previous tests, unless # coverPackages is on -- in that case, if we wanted this # module, we would have already returned True return not self.coverPackages def wantFile(self, file, package=None): """If inclusive coverage enabled, return true for all source files in wanted packages. """ if self.coverInclusive: if file.endswith(".py"): if package and self.coverPackages: for want in self.coverPackages: if package.startswith(want): return True else: return True return None
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