import sys
from twisted.trial import unittest
from twisted.internet import defer

import scrapy
from scrapy.utils.testproc import ProcessTest


class VersionTest(ProcessTest, unittest.TestCase):

    command = 'version'

    @defer.inlineCallbacks
    def test_output(self):
        encoding = getattr(sys.stdout, 'encoding') or 'utf-8'
        _, out, _ = yield self.execute([])
        self.assertEqual(
            out.strip().decode(encoding),
            f"Scrapy {scrapy.__version__}",
        )

    @defer.inlineCallbacks
    def test_verbose_output(self):
        encoding = getattr(sys.stdout, 'encoding') or 'utf-8'
        _, out, _ = yield self.execute(['-v'])
        headers = [
            line.partition(":")[0].strip()
            for line in out.strip().decode(encoding).splitlines()
        ]
        self.assertEqual(headers, ['Scrapy', 'lxml', 'libxml2',
                                   'cssselect', 'parsel', 'w3lib',
                                   'Twisted', 'Python', 'pyOpenSSL',
                                   'cryptography', 'Platform'])