feat(slice-3): storefronts domain — create + membership + INV-4 guard (§6.5)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/tests/test_storefronts_create.py

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+"""SLICE-3 storefront creation — service + endpoint scenario tests (SD-0001 §6.5 PUC-4/7)."""
+import re
+
+import psycopg
+import pytest
+from fastapi.testclient import TestClient
+
+from app.main import create_app
+from app.domains import storefronts
+from app.platform import db
+
+
+@pytest.fixture()
+def migrated_conn(fresh_db_url):
+    with psycopg.connect(fresh_db_url) as conn:
+        db.migrate(conn)
+        yield conn
+
+
+def _account_id(conn, email="merchant@example.com"):
+    return conn.execute(
+        "INSERT INTO account (email) VALUES (%s) RETURNING id", (email,)
+    ).fetchone()[0]
+
+
+def test_create_storefront_with_name(migrated_conn):
+    acct = _account_id(migrated_conn)
+    sf = storefronts.create_storefront(migrated_conn, acct, "merchant@example.com", "Ben's Bets")
+    assert sf.name == "Ben's Bets"
+    assert storefronts.storefront_for(migrated_conn, acct) == sf
+
+
+def test_14_01_0026_blank_name_gets_generated_default(migrated_conn):
+    acct = _account_id(migrated_conn)
+    sf = storefronts.create_storefront(migrated_conn, acct, "merchant@example.com", None)
+    assert sf.name == "merchant's storefront"
+
+
+def test_whitespace_name_treated_as_blank(migrated_conn):
+    acct = _account_id(migrated_conn)
+    sf = storefronts.create_storefront(migrated_conn, acct, "ben@bensbets.com", "   ")
+    assert sf.name == "ben's storefront"
+
+
+def test_second_create_refused_inv_4(migrated_conn):
+    acct = _account_id(migrated_conn)
+    storefronts.create_storefront(migrated_conn, acct, "merchant@example.com", "First")
+    with pytest.raises(storefronts.AlreadyOwnsStorefront):
+        storefronts.create_storefront(migrated_conn, acct, "merchant@example.com", "Second")
+
+
+def test_membership_row_is_owner(migrated_conn):
+    acct = _account_id(migrated_conn)
+    sf = storefronts.create_storefront(migrated_conn, acct, "merchant@example.com", None)
+    role = migrated_conn.execute(
+        "SELECT role FROM storefront_membership WHERE account_id = %s AND storefront_id = %s",
+        (acct, sf.id),
+    ).fetchone()[0]
+    assert role == "owner"
+
+
+def test_storefront_for_none_when_absent(migrated_conn):
+    acct = _account_id(migrated_conn)
+    assert storefronts.storefront_for(migrated_conn, acct) is None