add free-text test to test_api.py

Author: hrodmn

tests/api/test_api.py

@@ -548,6 +548,20 @@ async def test_get_collections_search(
     assert resp.json()["collections"][1]["id"] == load_test_collection["id"]
     assert resp.json()["collections"][0]["id"] == load_test2_collection.id
 
+    # free-text
+    resp = await app_client.get(
+        "/collections",
+        params={"q": "temperature"},
+    )
+    assert len(resp.json()["collections"]) == 1
+    assert resp.json()["collections"][0]["id"] == load_test2_collection.id
+
+    resp = await app_client.get(
+        "/collections",
+        params={"q": "nosuchthing"},
+    )
+    assert len(resp.json()["collections"]) == 0
+
 
 @pytest.mark.asyncio
 async def test_item_collection_filter_bbox(