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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Tests for helpers in report.py"""
from __future__ import annotations
from typing import IO, Iterable
import pytest
from coverage.exceptions import CoverageException
from coverage.report_core import render_report
from coverage.types import TMorf
from tests.coveragetest import CoverageTest
class FakeReporter:
"""A fake implementation of a one-file reporter."""
report_type = "fake report file"
def __init__(self, output: str = "", error: type[Exception] | None = None) -> None:
self.output = output
self.error = error
self.morfs: Iterable[TMorf] | None = None
def report(self, morfs: Iterable[TMorf] | None, outfile: IO[str]) -> float:
"""Fake."""
self.morfs = morfs
outfile.write(self.output)
if self.error:
raise self.error("You asked for it!")
return 17.25
class RenderReportTest(CoverageTest):
"""Tests of render_report."""
def test_stdout(self) -> None:
fake = FakeReporter(output="Hello!\n")
msgs: list[str] = []
res = render_report("-", fake, [pytest, "coverage"], msgs.append)
assert res == 17.25
assert fake.morfs == [pytest, "coverage"]
assert self.stdout() == "Hello!\n"
assert not msgs
def test_file(self) -> None:
fake = FakeReporter(output="Gréètings!\n")
msgs: list[str] = []
res = render_report("output.txt", fake, [], msgs.append)
assert res == 17.25
assert self.stdout() == ""
with open("output.txt", "rb") as f:
assert f.read().rstrip() == b"Gr\xc3\xa9\xc3\xa8tings!"
assert msgs == ["Wrote fake report file to output.txt"]
@pytest.mark.parametrize("error", [CoverageException, ZeroDivisionError])
def test_exception(self, error: type[Exception]) -> None:
fake = FakeReporter(error=error)
msgs: list[str] = []
with pytest.raises(error, match="You asked for it!"):
render_report("output.txt", fake, [], msgs.append)
assert self.stdout() == ""
self.assert_doesnt_exist("output.txt")
assert not msgs
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