test for stateless apps

integration/test_stateless_app.py

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+"""Integration tests for a stateless app."""
+
+from typing import Generator
+
+import httpx
+import pytest
+from playwright.sync_api import Page, expect
+
+import reflex as rx
+from reflex.testing import AppHarness
+
+
+def StatelessApp():
+    """A stateless app that renders a heading."""
+    import reflex as rx
+
+    def index():
+        return rx.heading("This is a stateless app")
+
+    app = rx.App()
+    app.add_page(index)
+
+
+@pytest.fixture(scope="module")
+def stateless_app(tmp_path_factory) -> Generator[AppHarness, None, None]:
+    """Create a stateless app AppHarness.
+
+    Args:
+        tmp_path_factory: pytest fixture for creating temporary directories.
+    """
+    with AppHarness.create(
+        root=tmp_path_factory.mktemp("stateless_app"),
+        app_source=StatelessApp,  # type: ignore
+    ) as harness:
+        yield harness
+
+
+def test_statelessness(stateless_app: AppHarness, page: Page):
+    """Test that the stateless app renders a heading but backend/_event is not mounted."""
+    assert stateless_app.frontend_url is not None
+    assert stateless_app.backend is not None
+    assert stateless_app.backend.started
+
+    res = httpx.get(rx.config.get_config().api_url + "/_event")
+    assert res.status_code == 404
+
+    res2 = httpx.get(rx.config.get_config().api_url + "/ping")
+    assert res2.status_code == 200
+
+    page.goto(stateless_app.frontend_url)
+    expect(page.get_by_role("heading")).to_have_text("This is a stateless app")