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- """Tests for mypy incremental error output."""
- from __future__ import annotations
- from mypy import build
- from mypy.errors import CompileError
- from mypy.modulefinder import BuildSource
- from mypy.options import Options
- from mypy.test.data import DataDrivenTestCase, DataSuite
- from mypy.test.helpers import assert_string_arrays_equal
- 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
- options.hide_error_codes = 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, f"Invalid output ({testcase.file}, line {testcase.line})"
- )
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