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"""Tests for mypy incremental error output."""
from typing import List
from mypy import build
from mypy.test.helpers import assert_string_arrays_equal
from mypy.test.data import DataDrivenTestCase, DataSuite
from mypy.modulefinder import BuildSource
from mypy.errors import CompileError
from mypy.options import Options
class ErrorStreamSuite(DataSuite):
required_out_section = True
base_path = '.'
files = ['errorstream.test']
def run_case(self, testcase: DataDrivenTestCase) -> None:
test_error_stream(testcase)
def test_error_stream(testcase: DataDrivenTestCase) -> None:
"""Perform a single error streaming test case.
The argument contains the description of the test case.
"""
options = Options()
options.show_traceback = True
logged_messages: List[str] = []
def flush_errors(msgs: List[str], serious: bool) -> None:
if msgs:
logged_messages.append('==== Errors flushed ====')
logged_messages.extend(msgs)
sources = [BuildSource('main', '__main__', '\n'.join(testcase.input))]
try:
build.build(sources=sources,
options=options,
flush_errors=flush_errors)
except CompileError as e:
assert e.messages == []
assert_string_arrays_equal(testcase.output, logged_messages,
'Invalid output ({}, line {})'.format(
testcase.file, testcase.line))
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