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Current File : //usr/lib/python3/dist-packages/mypy/test/testapi.py

from io import StringIO
import sys

import mypy.api

from mypy.test.helpers import Suite


class APISuite(Suite):

    def setUp(self) -> None:
        self.sys_stdout = sys.stdout
        self.sys_stderr = sys.stderr
        sys.stdout = self.stdout = StringIO()
        sys.stderr = self.stderr = StringIO()

    def tearDown(self) -> None:
        sys.stdout = self.sys_stdout
        sys.stderr = self.sys_stderr
        assert self.stdout.getvalue() == ''
        assert self.stderr.getvalue() == ''

    def test_capture_bad_opt(self) -> None:
        """stderr should be captured when a bad option is passed."""
        _, stderr, _ = mypy.api.run(['--some-bad-option'])
        assert isinstance(stderr, str)
        assert stderr != ''

    def test_capture_empty(self) -> None:
        """stderr should be captured when a bad option is passed."""
        _, stderr, _ = mypy.api.run([])
        assert isinstance(stderr, str)
        assert stderr != ''

    def test_capture_help(self) -> None:
        """stdout should be captured when --help is passed."""
        stdout, _, _ = mypy.api.run(['--help'])
        assert isinstance(stdout, str)
        assert stdout != ''

    def test_capture_version(self) -> None:
        """stdout should be captured when --version is passed."""
        stdout, _, _ = mypy.api.run(['--version'])
        assert isinstance(stdout, str)
        assert stdout != ''

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