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diff --git a/packages/meshbay-hub/tests/test_site_basics.py b/packages/meshbay-hub/tests/test_site_basics.py
new file mode 100644
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+++ b/packages/meshbay-hub/tests/test_site_basics.py
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+"""
+The files every website is expected to have at the root of its origin.
+
+They live in the hub's static directory, which is mounted at "/", so every hub
+serves them — meshbay.org included, because its Caddyfile hands the hub every
+path the public site does not name.
+"""
+
+import re
+from pathlib import Path
+
+import pytest
+from fastapi.testclient import TestClient
+from meshbay_hub.app import create_app
+
+CADDYFILE = Path(__file__).resolve().parents[3] / "packaging" / "caddy" / "meshbay.org.Caddyfile"
+
+
+@pytest.fixture(scope="module")
+def client():
+    return TestClient(create_app())
+
+
+def test_robots_keeps_crawlers_out_of_the_signed_in_views(client):
+    r = client.get("/robots.txt")
+    assert r.status_code == 200
+    assert r.headers["content-type"].startswith("text/plain")
+    rules = re.findall(r"^Disallow:\s*(\S+)", r.text, re.M)
+    assert "/app/" in rules and "/v1/" in rules
+    # A crawler rendering the sign-in page needs its scripts and stylesheet.
+    assert not any(rule in ("/", "/a/", "/app") for rule in rules), rules
+
+
+@pytest.mark.parametrize("path, magic", [
+    ("/favicon.ico", b"\x00\x00\x01\x00"),
+    ("/apple-touch-icon.png", b"\x89PNG"),
+])
+def test_the_icons_are_served_from_the_root(client, path, magic):
+    """Browsers ask for both at the root whether or not a page links them."""
+    r = client.get(path)
+    assert r.status_code == 200
+    assert r.content.startswith(magic), f"{path} is not the image it claims to be"
+
+
+@pytest.mark.skipif(not CADDYFILE.exists(), reason="no Caddyfile in this tree")
+@pytest.mark.parametrize("path", ["/robots.txt", "/favicon.ico", "/apple-touch-icon.png"])
+def test_meshbay_org_sends_them_to_the_hub(path):
+    """The public site owns only the paths its matcher names; a file claimed
+    there would be looked for in /srv/meshbay/site and 404."""
+    m = re.search(r"^\s*@site path (.+)$", CADDYFILE.read_text(), re.M)
+    assert m, "the @site matcher is gone"
+    assert path not in m.group(1).split()
+
+
+def _og(html: str, prop: str) -> str | None:
+    m = re.search(rf'<meta property="og:{prop}" content="([^"]*)">', html)
+    return m and m.group(1)
+
+
+def test_a_link_to_the_hub_previews_with_the_logo():
+    """Messengers draw a link from og:title and og:image, and resolve only an
+    absolute image URL — so it names the hub's public name, and the file is
+    one the hub serves."""
+    from meshbay_hub.config import load_config
+    cfg = load_config()
+    cfg.identity.id = "hub.example.org"
+    client = TestClient(create_app(cfg))
+    for path in ("/", "/app"):
+        html = client.get(path).text
+        assert _og(html, "title") == "MeshBay"
+        assert _og(html, "image") == "https://hub.example.org/og-image.jpg", path
+    image = client.get("/og-image.jpg")
+    assert image.status_code == 200 and image.content.startswith(b"\xff\xd8")
+    assert len(image.content) < 300_000, "too heavy for some messengers to fetch"
+
+
+def test_the_preview_description_fits_in_a_preview():
+    """A preview shows a line or two and cuts the rest; a cut sentence says
+    nothing."""
+    from meshbay_hub.api.webapp import PREVIEW_DESCRIPTION
+    assert len(PREVIEW_DESCRIPTION) <= 60