old_contents: #!/usr/bin/env python3
  import os
  import unittest
  import subprocess
  import tempfile
  
  import bazelisk
  
  
  def execute_bazel(bazel_path, argv):
    return subprocess.check_output(
        [bazel_path] + argv, close_fds=os.name != 'nt', stderr=subprocess.STDOUT)
  
  
  class TestBazelisk(unittest.TestCase):
    """Integration tests for Bazelisk."""
  
    def setUp(self):
      # Override Bazelisk's default function to execute Bazel, so that we can grab the output.
      bazelisk.execute_bazel = execute_bazel
      os.environ["BAZELISK_HOME"] = tempfile.mkdtemp(
          dir=os.environ["TEST_TMPDIR"])
  
    def test_bazel_version(self):
      output = bazelisk.main(["bazelisk", "version"])
      self.assertTrue("Build label" in output)
  
    def test_bazel_version_from_environment(self):
      os.environ["USE_BAZEL_VERSION"] = "0.20.0"
      try:
        output = bazelisk.main(["bazelisk", "version"])
      finally:
        del os.environ["USE_BAZEL_VERSION"]
      self.assertTrue("Build label: 0.20.0" in output)
  
    def test_bazel_version_from_file(self):
      with open("WORKSPACE", "w") as f:
        pass
      with open(".bazelversion", "w") as f:
        f.write("0.19.0")
      try:
        output = bazelisk.main(["bazelisk", "version"])
      finally:
        os.unlink("WORKSPACE")
        os.unlink(".bazelversion")
      self.assertTrue("Build label: 0.19.0" in output)
  
  
  if __name__ == "__main__":
    unittest.main()
  
new_contents: #!/usr/bin/env python3
  import os
  import unittest
  import subprocess
  import tempfile
  
  import bazelisk
  
  
  def execute_bazel(bazel_path, argv):
    return subprocess.check_output(
        [bazel_path] + argv, close_fds=os.name != 'nt',
        stderr=subprocess.STDOUT).decode("utf-8")
  
  
  class TestBazelisk(unittest.TestCase):
    """Integration tests for Bazelisk."""
  
    def setUp(self):
      # Override Bazelisk's default function to execute Bazel, so that we can grab the output.
      bazelisk.execute_bazel = execute_bazel
      os.environ["BAZELISK_HOME"] = tempfile.mkdtemp(
          dir=os.environ["TEST_TMPDIR"])
  
    def test_bazel_version(self):
      output = bazelisk.main(["bazelisk", "version"])
      self.assertTrue("Build label" in output)
  
    def test_bazel_version_from_environment(self):
      os.environ["USE_BAZEL_VERSION"] = "0.20.0"
      try:
        output = bazelisk.main(["bazelisk", "version"])
      finally:
        del os.environ["USE_BAZEL_VERSION"]
      self.assertTrue("Build label: 0.20.0" in output)
  
    def test_bazel_version_from_file(self):
      with open("WORKSPACE", "w") as f:
        pass
      with open(".bazelversion", "w") as f:
        f.write("0.19.0")
      try:
        output = bazelisk.main(["bazelisk", "version"])
      finally:
        os.unlink("WORKSPACE")
        os.unlink(".bazelversion")
      self.assertTrue("Build label: 0.19.0" in output)
  
  
  if __name__ == "__main__":
    unittest.main()
  
subject: Fix assert failure on Windows