File: test_lib.py

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# Copyright (C) 2013,2014,2015 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2013,2014,2015 YAMAMOTO Takashi <yamamoto at valinux co jp>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import gettext
import os
import unittest
import six
import sys
import types
import logging

from nose import result
from nose import core
from nose import config


class _AnsiColorizer(object):
    """
    A colorizer is an object that loosely wraps around a stream, allowing
    callers to write text to the stream in a particular color.

    Colorizer classes must implement C{supported()} and C{write(text, color)}.
    """
    _colors = dict(black=30, red=31, green=32, yellow=33,
                   blue=34, magenta=35, cyan=36, white=37)

    def __init__(self, stream):
        self.stream = stream

    def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                # guess false in case of error
                return False
    supported = classmethod(supported)

    def write(self, text, color):
        """
        Write the given text to the stream in the given color.

        @param text: Text to be written to the stream.

        @param color: A string label for a color. e.g. 'red', 'white'.
        """
        color = self._colors[color]
        self.stream.write('\x1b[%s;1m%s\x1b[0m' % (color, text))


class _Win32Colorizer(object):
    """
    See _AnsiColorizer docstring.
    """

    def __init__(self, stream):
        from win32console import GetStdHandle, STD_OUT_HANDLE
        from win32console import FOREGROUND_RED, FOREGROUND_BLUE
        from win32console import FOREGROUND_GREEN, FOREGROUND_INTENSITY
        red, green, blue, bold = (FOREGROUND_RED, FOREGROUND_GREEN,
                                  FOREGROUND_BLUE, FOREGROUND_INTENSITY)
        self.stream = stream
        self.screenBuffer = GetStdHandle(STD_OUT_HANDLE)
        self._colors = {
            'normal': red | green | blue,
            'red': red | bold,
            'green': green | bold,
            'blue': blue | bold,
            'yellow': red | green | bold,
            'magenta': red | blue | bold,
            'cyan': green | blue | bold,
            'white': red | green | blue | bold}

    def supported(cls, stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True
    supported = classmethod(supported)

    def write(self, text, color):
        color = self._colors[color]
        self.screenBuffer.SetConsoleTextAttribute(color)
        self.stream.write(text)
        self.screenBuffer.SetConsoleTextAttribute(self._colors['normal'])


class _NullColorizer(object):
    """
    See _AnsiColorizer docstring.
    """

    def __init__(self, stream):
        self.stream = stream

    def supported(cls, stream=sys.stdout):
        return True
    supported = classmethod(supported)

    def write(self, text, color):
        self.stream.write(text)


class RyuTestResult(result.TextTestResult):
    def __init__(self, *args, **kw):
        result.TextTestResult.__init__(self, *args, **kw)
        self._last_case = None
        self.colorizer = None
        # NOTE(vish, tfukushima): reset stdout for the terminal check
        stdout = sys.__stdout__
        sys.stdout = sys.__stdout__
        for colorizer in [_Win32Colorizer, _AnsiColorizer, _NullColorizer]:
            if colorizer.supported():
                self.colorizer = colorizer(self.stream)
                break
        sys.stdout = stdout

    def getDescription(self, test):
        return str(test)

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addSuccess(self, test):
        unittest.TestResult.addSuccess(self, test)
        if self.showAll:
            self.colorizer.write("OK", 'green')
            self.stream.writeln()
        elif self.dots:
            self.stream.write('.')
            self.stream.flush()

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addFailure(self, test, err):
        unittest.TestResult.addFailure(self, test, err)
        if self.showAll:
            self.colorizer.write("FAIL", 'red')
            self.stream.writeln()
        elif self.dots:
            self.stream.write('F')
            self.stream.flush()

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addError(self, test, err):
        """Overrides normal addError to add support for errorClasses.
        If the exception is a registered class, the error will be added
        to the list for that class, not errors.
        """
        stream = getattr(self, 'stream', None)
        ec, ev, tb = err
        try:
            exc_info = self._exc_info_to_string(err, test)
        except TypeError:
            # This is for compatibility with Python 2.3.
            exc_info = self._exc_info_to_string(err)
        for cls, (storage, label, isfail) in self.errorClasses.items():
            if result.isclass(ec) and issubclass(ec, cls):
                if isfail:
                    test.passwd = False
                storage.append((test, exc_info))
                # Might get patched into a streamless result
                if stream is not None:
                    if self.showAll:
                        message = [label]
                        detail = result._exception_detail(err[1])
                        if detail:
                            message.append(detail)
                        stream.writeln(": ".join(message))
                    elif self.dots:
                        stream.write(label[:1])
                return
        self.errors.append((test, exc_info))
        test.passed = False
        if stream is not None:
            if self.showAll:
                self.colorizer.write("ERROR", 'red')
                self.stream.writeln()
            elif self.dots:
                stream.write('E')

    def startTest(self, test):
        unittest.TestResult.startTest(self, test)
        current_case = test.test.__class__.__name__

        if self.showAll:
            if current_case != self._last_case:
                self.stream.writeln(current_case)
                self._last_case = current_case
            # NOTE(salvatore-orlando):
            # slightly changed in order to print test case class
            # together with unit test name
            self.stream.write(
                '    %s' % str(test.test).ljust(60))
            self.stream.flush()


class RyuTestRunner(core.TextTestRunner):
    def _makeResult(self):
        return RyuTestResult(self.stream,
                             self.descriptions,
                             self.verbosity,
                             self.config)


def run_tests(c=None):
    logger = logging.getLogger()
    hdlr = logging.StreamHandler()
    formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
    hdlr.setFormatter(formatter)
    logger.addHandler(hdlr)
    logger.setLevel(logging.DEBUG)

    # NOTE(bgh): I'm not entirely sure why but nose gets confused here when
    # calling run_tests from a plugin directory run_tests.py (instead of the
    # main run_tests.py).  It will call run_tests with no arguments and the
    # testing of run_tests will fail (though the plugin tests will pass).  For
    # now we just return True to let the run_tests test pass.
    if not c:
        return True

    runner = RyuTestRunner(stream=c.stream,
                           verbosity=c.verbosity,
                           config=c)
    return not core.run(config=c, testRunner=runner)


def add_method(cls, method_name, method):
    """Add the method to the class dynamically, keeping unittest/nose happy."""
    method.func_name = method_name
    method.__name__ = method_name
    if six.PY3:
        methodtype = types.MethodType(method, cls)
        if not hasattr(method, "__qualname__"):
            method.__qualname__ = "%s.%s" % (cls.__qualname__, method_name)
    else:
        methodtype = types.MethodType(method, None, cls)
    setattr(cls, method_name, methodtype)