1 files changed, 170 insertions, 0 deletions
diff --git a/tests/error_handler_test.py b/tests/error_handler_test.py
new file mode 100644
index 0000000..833bb8f
--- /dev/null
+++ b/tests/error_handler_test.py
@@ -0,0 +1,170 @@
+import os.path
+import re
+import sys
+from unittest import mock
+
+import pytest
+
+from pre_commit import error_handler
+from pre_commit.util import CalledProcessError
+from testing.util import cmd_output_mocked_pre_commit_home
+
+
+@pytest.fixture
+def mocked_log_and_exit():
+    with mock.patch.object(error_handler, '_log_and_exit') as log_and_exit:
+        yield log_and_exit
+
+
+def test_error_handler_no_exception(mocked_log_and_exit):
+    with error_handler.error_handler():
+        pass
+    assert mocked_log_and_exit.call_count == 0
+
+
+def test_error_handler_fatal_error(mocked_log_and_exit):
+    exc = error_handler.FatalError('just a test')
+    with error_handler.error_handler():
+        raise exc
+
+    mocked_log_and_exit.assert_called_once_with(
+        'An error has occurred',
+        exc,
+        # Tested below
+        mock.ANY,
+    )
+
+    assert re.match(
+        r'Traceback \(most recent call last\):\n'
+        r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
+        r'    yield\n'
+        r'  File ".+tests.error_handler_test.py", line \d+, '
+        r'in test_error_handler_fatal_error\n'
+        r'    raise exc\n'
+        r'(pre_commit\.error_handler\.)?FatalError: just a test\n',
+        mocked_log_and_exit.call_args[0][2],
+    )
+
+
+def test_error_handler_uncaught_error(mocked_log_and_exit):
+    exc = ValueError('another test')
+    with error_handler.error_handler():
+        raise exc
+
+    mocked_log_and_exit.assert_called_once_with(
+        'An unexpected error has occurred',
+        exc,
+        # Tested below
+        mock.ANY,
+    )
+    assert re.match(
+        r'Traceback \(most recent call last\):\n'
+        r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
+        r'    yield\n'
+        r'  File ".+tests.error_handler_test.py", line \d+, '
+        r'in test_error_handler_uncaught_error\n'
+        r'    raise exc\n'
+        r'ValueError: another test\n',
+        mocked_log_and_exit.call_args[0][2],
+    )
+
+
+def test_error_handler_keyboardinterrupt(mocked_log_and_exit):
+    exc = KeyboardInterrupt()
+    with error_handler.error_handler():
+        raise exc
+
+    mocked_log_and_exit.assert_called_once_with(
+        'Interrupted (^C)',
+        exc,
+        # Tested below
+        mock.ANY,
+    )
+    assert re.match(
+        r'Traceback \(most recent call last\):\n'
+        r'  File ".+pre_commit.error_handler.py", line \d+, in error_handler\n'
+        r'    yield\n'
+        r'  File ".+tests.error_handler_test.py", line \d+, '
+        r'in test_error_handler_keyboardinterrupt\n'
+        r'    raise exc\n'
+        r'KeyboardInterrupt\n',
+        mocked_log_and_exit.call_args[0][2],
+    )
+
+
+def test_log_and_exit(cap_out, mock_store_dir):
+    with pytest.raises(SystemExit):
+        error_handler._log_and_exit(
+            'msg', error_handler.FatalError('hai'), "I'm a stacktrace",
+        )
+
+    printed = cap_out.get()
+    log_file = os.path.join(mock_store_dir, 'pre-commit.log')
+    assert printed == f'msg: FatalError: hai\nCheck the log at {log_file}\n'
+
+    assert os.path.exists(log_file)
+    with open(log_file) as f:
+        logged = f.read()
+        expected = (
+            r'^### version information\n'
+            r'\n'
+            r'```\n'
+            r'pre-commit version: \d+\.\d+\.\d+\n'
+            r'sys.version:\n'
+            r'(    .*\n)*'
+            r'sys.executable: .*\n'
+            r'os.name: .*\n'
+            r'sys.platform: .*\n'
+            r'```\n'
+            r'\n'
+            r'### error information\n'
+            r'\n'
+            r'```\n'
+            r'msg: FatalError: hai\n'
+            r'```\n'
+            r'\n'
+            r'```\n'
+            r"I'm a stacktrace\n"
+            r'```\n'
+        )
+        assert re.match(expected, logged)
+
+
+def test_error_handler_non_ascii_exception(mock_store_dir):
+    with pytest.raises(SystemExit):
+        with error_handler.error_handler():
+            raise ValueError('☃')
+
+
+def test_error_handler_non_utf8_exception(mock_store_dir):
+    with pytest.raises(SystemExit):
+        with error_handler.error_handler():
+            raise CalledProcessError(1, ('exe',), 0, b'error: \xa0\xe1', b'')
+
+
+def test_error_handler_non_stringable_exception(mock_store_dir):
+    class C(Exception):
+        def __str__(self):
+            raise RuntimeError('not today!')
+
+    with pytest.raises(SystemExit):
+        with error_handler.error_handler():
+            raise C()
+
+
+def test_error_handler_no_tty(tempdir_factory):
+    pre_commit_home = tempdir_factory.get()
+    ret, out, _ = cmd_output_mocked_pre_commit_home(
+        sys.executable,
+        '-c',
+        'from pre_commit.error_handler import error_handler\n'
+        'with error_handler():\n'
+        '    raise ValueError("\\u2603")\n',
+        retcode=1,
+        tempdir_factory=tempdir_factory,
+        pre_commit_home=pre_commit_home,
+    )
+    log_file = os.path.join(pre_commit_home, 'pre-commit.log')
+    out_lines = out.splitlines()
+    assert out_lines[-2] == 'An unexpected error has occurred: ValueError: ☃'
+    assert out_lines[-1] == f'Check the log at {log_file}'