#!/usr/bin/env python
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# to you under the Apache License, Version 2.0 (the
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#     http://www.apache.org/licenses/LICENSE-2.0
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import logging
import unittest

from nose.tools import assert_equals, assert_not_equal

from desktop.lib import i18n

from hadoop import pseudo_hdfs4
from hadoop.fs.fsutils import remove_header, do_overwrite_save


LOG = logging.getLogger(__name__)


class FsUtilsTests(unittest.TestCase):
  requires_hadoop = True

  @classmethod
  def setUpClass(cls):
    cls.cluster = pseudo_hdfs4.shared_cluster()

  def setUp(self):
    self.cluster.fs.setuser('test')

  def tearDown(self):
    try:
      self.cluster.fs.purge_trash()
    except Exception, e:
      LOG.error('Could not clean up trash: %s', e)

  def test_remove_header(self):
    fs = self.cluster.fs

    path = "/tmp/test_remove_header.txt"
    data_header = "destination\trank"
    data_body = """thailand\t10
costarica\t?
curacao\t?"""
    data = data_header + '\n' + data_body

    f = fs.open(path, "w")
    f.write("hello")
    f.close()

    encoding = i18n.get_site_encoding()
    do_overwrite_save(fs, path, data.encode(encoding))

    assert_not_equal(data_body, fs.open(path).read())

    remove_header(fs, path)

    assert_equals(data_body, fs.open(path).read())
