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name : test_runner.py
 import os
import sys
import tempfile
import unittest
from unittest import mock

from tap import TAPTestRunner
from tap.runner import TAPTestResult, _tracker


class TestTAPTestRunner(unittest.TestCase):
    def test_has_tap_test_result(self):
        runner = TAPTestRunner()
        self.assertEqual(runner.resultclass, TAPTestResult)

    def test_runner_uses_outdir(self):
        """Test that the test runner sets the outdir so that TAP
        files will be written to that location.

        Setting class attributes to get the right behavior is a dirty hack, but
        the unittest classes aren't very extensible.
        """
        # Save the previous outdir in case **this** execution was using it.
        previous_outdir = _tracker.outdir
        outdir = tempfile.mkdtemp()

        TAPTestRunner.set_outdir(outdir)

        self.assertEqual(outdir, _tracker.outdir)

        _tracker.outdir = previous_outdir

    def test_runner_uses_format(self):
        """Test that format is set on TAPTestResult FORMAT."""
        # Save the previous format in case **this** execution was using it.
        previous_format = TAPTestResult.FORMAT
        fmt = "{method_name}: {short_description}"

        TAPTestRunner.set_format(fmt)

        self.assertEqual(fmt, TAPTestResult.FORMAT)

        TAPTestResult.FORMAT = previous_format

    def test_runner_uses_combined(self):
        """Test that output is combined."""
        # Save previous combined in case **this** execution was using it.
        previous_combined = _tracker.combined

        TAPTestRunner.set_combined(True)

        self.assertTrue(_tracker.combined)

        _tracker.combined = previous_combined

    @mock.patch("sys.exit")
    def test_bad_format_string(self, fake_exit):
        """A bad format string exits the runner."""
        previous_format = TAPTestResult.FORMAT
        bad_format = "Not gonna work {sort_desc}"
        TAPTestRunner.set_format(bad_format)
        result = TAPTestResult(None, True, 1)
        test = mock.Mock()

        result._description(test)

        self.assertTrue(fake_exit.called)

        TAPTestResult.FORMAT = previous_format

    def test_runner_sets_tracker_for_streaming(self):
        """The tracker is set for streaming mode."""
        previous_streaming = _tracker.streaming
        previous_stream = _tracker.stream
        runner = TAPTestRunner()

        runner.set_stream(True)

        self.assertTrue(_tracker.streaming)
        self.assertTrue(_tracker.stream, sys.stdout)

        _tracker.streaming = previous_streaming
        _tracker.stream = previous_stream

    def test_runner_stream_to_devnull_for_streaming(self):
        previous_streaming = _tracker.streaming
        previous_stream = _tracker.stream
        runner = TAPTestRunner()

        runner.set_stream(True)

        self.assertTrue(runner.stream.stream.name, os.devnull)

        _tracker.streaming = previous_streaming
        _tracker.stream = previous_stream

    def test_runner_uses_header(self):
        """Test that the case header can be turned off."""
        # Save previous header in case **this** execution was using it.
        previous_header = _tracker.header

        TAPTestRunner.set_header(False)
        self.assertFalse(_tracker.header)

        TAPTestRunner.set_header(True)
        self.assertTrue(_tracker.header)

        _tracker.header = previous_header
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