text: import os
  
  import pytest
  
  from pip.download import _get_hash_from_file, _check_hash
  from pip.exceptions import InstallationError
  from pip.index import Link
  
  
  def test_get_hash_from_file_md5(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#md5=d41d8cd98f00b204e9800998ecf8427e")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 16
      assert download_hash.hexdigest() == "d41d8cd98f00b204e9800998ecf8427e"
  
  
  def test_get_hash_from_file_sha1(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha1=da39a3ee5e6b4b0d3255bfef95601890afd80709")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 20
      assert download_hash.hexdigest() == "da39a3ee5e6b4b0d3255bfef95601890afd80709"
  
  
  def test_get_hash_from_file_sha224(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha224=d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 28
      assert download_hash.hexdigest() == "d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f"
  
  
  def test_get_hash_from_file_sha384(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha384=38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 48
      assert download_hash.hexdigest() == "38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b"
  
  
  def test_get_hash_from_file_sha256(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 32
      assert download_hash.hexdigest() == "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
  
  
  def test_get_hash_from_file_sha512(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha512=cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash.digest_size == 64
      assert download_hash.hexdigest() == "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e"
  
  
  def test_get_hash_from_file_unknown(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#unknown_hash=d41d8cd98f00b204e9800998ecf8427e")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      assert download_hash is None
  
  
  def test_check_hash_md5_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#md5=d41d8cd98f00b204e9800998ecf8427e")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_md5_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#md5=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha1_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha1=da39a3ee5e6b4b0d3255bfef95601890afd80709")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha1_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha1=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha224_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha224=d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f'")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha224_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha224=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha384_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha384=38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha384_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha384=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha256_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha256_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha256=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha512_valid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha512=cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      _check_hash(download_hash, file_link)
  
  
  def test_check_hash_sha512_invalid(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#sha512=deadbeef")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, file_link)
  
  
  def test_check_hasher_mismsatch(data):
      file_path = data.packages.join("gmpy-1.15.tar.gz")
      file_link = Link("http://testserver/gmpy-1.15.tar.gz#md5=d41d8cd98f00b204e9800998ecf8427e")
      other_link = Link("http://testserver/gmpy-1.15.tar.gz#sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
  
      download_hash = _get_hash_from_file(file_path, file_link)
  
      with pytest.raises(InstallationError):
          _check_hash(download_hash, other_link)
  