Method test_chained_exceptions

testing/test_reports.py:275–348

Check serialization/deserialization of report objects containing chained exceptions (#5786)

(
        self, pytester: Pytester, tw_mock, report_class
    )

    @pytest.mark.parametrize("report_class", [TestReport, CollectReport])
    def test_chained_exceptions(
        self, pytester: Pytester, tw_mock, report_class
    ) -> None:
        """Check serialization/deserialization of report objects containing chained exceptions (#5786)"""
        pytester.makepyfile(
            """
            def foo():
                raise ValueError('value error')
            def test_a():
                try:
                    foo()
                except ValueError as e:
                    raise RuntimeError('runtime error') from e
            if {error_during_import}:
                test_a()
        """.format(
                error_during_import=report_class is CollectReport
            )
        )

        reprec = pytester.inline_run()
        if report_class is TestReport:
            reports: Union[
                Sequence[TestReport], Sequence[CollectReport]
            ] = reprec.getreports("pytest_runtest_logreport")
            # we have 3 reports: setup/call/teardown
            assert len(reports) == 3
            # get the call report
            report = reports[1]
        else:
            assert report_class is CollectReport
            # two collection reports: session and test file
            reports = reprec.getreports("pytest_collectreport")
            assert len(reports) == 2
            report = reports[1]

        def check_longrepr(longrepr: ExceptionChainRepr) -> None:
            """Check the attributes of the given longrepr object according to the test file.

            We can get away with testing both CollectReport and TestReport with this function because
            the longrepr objects are very similar.
            """
            assert isinstance(longrepr, ExceptionChainRepr)
            assert longrepr.sections == [("title", "contents", "=")]
            assert len(longrepr.chain) == 2
            entry1, entry2 = longrepr.chain
            tb1, fileloc1, desc1 = entry1
            tb2, fileloc2, desc2 = entry2

            assert "ValueError('value error')" in str(tb1)
            assert "RuntimeError('runtime error')" in str(tb2)

            assert (
                desc1
                == "The above exception was the direct cause of the following exception:"
            )
            assert desc2 is None