Reads the content of the input JSON and returns testcases results.

def _parse_ostriz(ostriz_data):
    """Reads the content of the input JSON and returns testcases results."""
    if not ostriz_data:
        raise NothingToDoException("No data to import")

    results = []
    found_build = None
    last_finish_time = [0]
    for test_path, test_data in six.iteritems(ostriz_data):
        curr_build = test_data.get("build")
        if not curr_build:
            continue

        # set `found_build` from first record where it's present
        if not found_build:
            found_build = curr_build

        # make sure we are collecting data for the same build
        if found_build != curr_build:
            continue

        if not test_data.get("statuses"):
            continue

        _append_record(test_data, results, test_path)
        _comp_finish_time(test_data, last_finish_time)

    if last_finish_time[0]:
        logger.info("Last result finished at %s", last_finish_time[0])

    testrun_id = _get_testrun_id(found_build)
    return xunit_exporter.ImportedData(results=results, testrun=testrun_id)