datasette/tests/test_playwright.py

import socket
import subprocess
import sys
import time

import httpx
import pytest

from datasette.fixtures import write_fixture_database


def find_free_port():
    with socket.socket() as sock:
        sock.bind(("127.0.0.1", 0))
        return sock.getsockname()[1]


def wait_for_server(process, url, timeout=10):
    deadline = time.monotonic() + timeout
    last_error = None
    while time.monotonic() < deadline:
        if process.poll() is not None:
            stdout, stderr = process.communicate()
            raise AssertionError(
                "Datasette server exited early\n"
                f"stdout:\n{stdout}\n"
                f"stderr:\n{stderr}"
            )
        try:
            response = httpx.get(url, timeout=1.0)
            if response.status_code < 500:
                return
            last_error = f"HTTP {response.status_code}: {response.text[:200]}"
        except httpx.HTTPError as ex:
            last_error = repr(ex)
        time.sleep(0.1)
    raise AssertionError(f"Timed out waiting for {url}: {last_error}")


@pytest.fixture
def datasette_server(tmp_path):
    db_path = tmp_path / "fixtures.db"
    write_fixture_database(str(db_path))
    port = find_free_port()
    process = subprocess.Popen(
        [
            sys.executable,
            "-m",
            "datasette",
            str(db_path),
            "--host",
            "127.0.0.1",
            "--port",
            str(port),
            "--setting",
            "num_sql_threads",
            "1",
        ],
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        text=True,
    )
    url = f"http://127.0.0.1:{port}/"
    try:
        wait_for_server(process, url)
        yield url
    finally:
        process.terminate()
        try:
            process.wait(timeout=5)
        except subprocess.TimeoutExpired:
            process.kill()
            process.wait()


@pytest.mark.playwright
def test_datasette_homepage_contains_datasette(page, datasette_server):
    page.goto(datasette_server)
    assert "Datasette" in page.locator("body").inner_text()