feat(fc3a): /api/artists POST + autocomplete

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_api_artists_create.py

@@ -0,0 +1,62 @@
+import pytest
+
+from backend.app import create_app
+
+pytestmark = pytest.mark.integration
+
+
+@pytest.fixture
+async def app():
+    return create_app()
+
+
+@pytest.fixture
+async def client(app):
+    async with app.test_client() as c:
+        yield c
+
+
+@pytest.mark.asyncio
+async def test_create_artist_returns_201(client):
+    resp = await client.post("/api/artists", json={"name": "Alice"})
+    assert resp.status_code == 201
+    body = await resp.get_json()
+    assert body["name"] == "Alice"
+    assert body["slug"] == "alice"
+    assert body["created"] is True
+
+
+@pytest.mark.asyncio
+async def test_create_artist_idempotent(client):
+    a = await client.post("/api/artists", json={"name": "Bob"})
+    b = await client.post("/api/artists", json={"name": "Bob"})
+    assert (await a.get_json())["created"] is True
+    body_b = await b.get_json()
+    assert body_b["created"] is False
+    assert body_b["id"] == (await a.get_json())["id"]
+
+
+@pytest.mark.asyncio
+async def test_create_artist_rejects_empty(client):
+    resp = await client.post("/api/artists", json={"name": "   "})
+    assert resp.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_autocomplete_returns_matches(client):
+    await client.post("/api/artists", json={"name": "Alice"})
+    await client.post("/api/artists", json={"name": "Alice Cooper"})
+    await client.post("/api/artists", json={"name": "Bob"})
+    resp = await client.get("/api/artists/autocomplete?q=alic")
+    assert resp.status_code == 200
+    names = [a["name"] for a in await resp.get_json()]
+    assert "Alice" in names
+    assert "Alice Cooper" in names
+    assert "Bob" not in names
+
+
+@pytest.mark.asyncio
+async def test_autocomplete_empty_query(client):
+    resp = await client.get("/api/artists/autocomplete?q=")
+    assert resp.status_code == 200
+    assert await resp.get_json() == []