pyodide/conftest.py

"""
Various common utilities for testing.
"""
import pathlib
import sys

import pytest

pytest_plugins = ("pytest_asyncio",)

ROOT_PATH = pathlib.Path(__file__).parents[0].resolve()
DIST_PATH = ROOT_PATH / "dist"

sys.path.append(str(ROOT_PATH / "pyodide-test-runner"))
sys.path.append(str(ROOT_PATH / "pyodide-build"))
sys.path.append(str(ROOT_PATH / "src" / "py"))

from pyodide_test_runner.fixture import (  # noqa: F401
    script_type,
    selenium,
    selenium_common,
    selenium_context_manager,
    selenium_esm,
    selenium_module_scope,
    selenium_standalone,
    selenium_standalone_noload,
    selenium_standalone_noload_common,
    selenium_webworker_standalone,
    web_server_main,
    web_server_secondary,
)
from pyodide_test_runner.utils import maybe_skip_test
from pyodide_test_runner.utils import package_is_built as _package_is_built


def pytest_addoption(parser):
    group = parser.getgroup("general")
    group.addoption(
        "--dist-dir",
        action="store",
        default=DIST_PATH,
        help="Path to the dist directory",
    )
    group.addoption(
        "--run-xfail",
        action="store_true",
        help="If provided, tests marked as xfail will be run",
    )


def pytest_configure(config):
    """Monkey patch the function cwd_relative_nodeid

    returns the description of a test for the short summary table. Monkey patch
    it to reduce the verbosity of the test names in the table.  This leaves
    enough room to see the information about the test failure in the summary.
    """
    global CONFIG

    old_cwd_relative_nodeid = config.cwd_relative_nodeid

    def cwd_relative_nodeid(*args):
        result = old_cwd_relative_nodeid(*args)
        result = result.replace("src/tests/", "")
        result = result.replace("packages/", "")
        result = result.replace("::test_", "::")
        return result

    config.cwd_relative_nodeid = cwd_relative_nodeid

    pytest.pyodide_dist_dir = config.getoption("--dist-dir")


def pytest_collection_modifyitems(config, items):
    """Called after collect is completed.
    Parameters
    ----------
    config : pytest config
    items : list of collected items
    """
    for item in items:
        maybe_skip_test(item, config.getoption("--dist-dir"), delayed=True)


@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_call(item):
    """We want to run extra verification at the start and end of each test to
    check that we haven't leaked memory. According to pytest issue #5044, it's
    not possible to "Fail" a test from a fixture (no matter what you do, pytest
    sets the test status to "Error"). The approach suggested there is hook
    pytest_runtest_call as we do here. To get access to the selenium fixture, we
    imitate the definition of pytest_pyfunc_call:
    https://github.com/pytest-dev/pytest/blob/6.2.2/src/_pytest/python.py#L177

    Pytest issue #5044:
    https://github.com/pytest-dev/pytest/issues/5044
    """
    browser = None
    for fixture in item._fixtureinfo.argnames:
        if fixture.startswith("selenium"):
            browser = item.funcargs[fixture]
            break
    if browser and browser.pyodide_loaded:
        trace_pyproxies = pytest.mark.skip_pyproxy_check.mark not in item.own_markers
        trace_hiwire_refs = (
            trace_pyproxies
            and pytest.mark.skip_refcount_check.mark not in item.own_markers
        )
        yield from extra_checks_test_wrapper(
            browser, trace_hiwire_refs, trace_pyproxies
        )
    else:
        yield


def extra_checks_test_wrapper(browser, trace_hiwire_refs, trace_pyproxies):
    """Extra conditions for test to pass:
    1. No explicit request for test to fail
    2. No leaked JsRefs
    3. No leaked PyProxys
    """
    browser.clear_force_test_fail()
    init_num_keys = browser.get_num_hiwire_keys()
    if trace_pyproxies:
        browser.enable_pyproxy_tracing()
        init_num_proxies = browser.get_num_proxies()
    a = yield
    try:
        # If these guys cause a crash because the test really screwed things up,
        # we override the error message with the better message returned by
        # a.result() in the finally block.
        browser.disable_pyproxy_tracing()
        browser.restore_state()
    finally:
        # if there was an error in the body of the test, flush it out by calling
        # get_result (we don't want to override the error message by raising a
        # different error here.)
        a.get_result()
    if browser.force_test_fail:
        raise Exception("Test failure explicitly requested but no error was raised.")
    if trace_pyproxies and trace_hiwire_refs:
        delta_proxies = browser.get_num_proxies() - init_num_proxies
        delta_keys = browser.get_num_hiwire_keys() - init_num_keys
        assert (delta_proxies, delta_keys) == (0, 0) or delta_keys < 0
    if trace_hiwire_refs:
        delta_keys = browser.get_num_hiwire_keys() - init_num_keys
        assert delta_keys <= 0


def package_is_built(package_name):
    return _package_is_built(package_name, pytest.pyodide_dist_dir)


import ast
from copy import deepcopy
from typing import Any

from _pytest.assertion.rewrite import AssertionRewritingHook, rewrite_asserts
from _pytest.python import (
    pytest_pycollect_makemodule as orig_pytest_pycollect_makemodule,
)

# Handling for pytest assertion rewrites


# First we find the pytest rewrite config. It's an attribute of the pytest
# assertion rewriting meta_path_finder, so we locate that to get the config.


def _get_pytest_rewrite_config() -> Any:
    for meta_path_finder in sys.meta_path:
        if isinstance(meta_path_finder, AssertionRewritingHook):
            break
    else:
        return None
    return meta_path_finder.config


# Now we need to parse the ast of the files, rewrite the ast, and store the
# original and rewritten ast into dictionaries. `run_in_pyodide` will look the
# ast up in the appropriate dictionary depending on whether or not it is using
# pytest assert rewrites.

REWRITE_CONFIG = _get_pytest_rewrite_config()
del _get_pytest_rewrite_config

ORIGINAL_MODULE_ASTS: dict[str, ast.Module] = {}
REWRITTEN_MODULE_ASTS: dict[str, ast.Module] = {}


def pytest_pycollect_makemodule(
    module_path: pathlib.Path, path: Any, parent: Any
) -> None:
    source = module_path.read_bytes()
    strfn = str(module_path)
    tree = ast.parse(source, filename=strfn)
    ORIGINAL_MODULE_ASTS[strfn] = tree
    tree2 = deepcopy(tree)
    rewrite_asserts(tree2, source, strfn, REWRITE_CONFIG)
    REWRITTEN_MODULE_ASTS[strfn] = tree2
    orig_pytest_pycollect_makemodule(module_path, parent)