add fields plus query test

Author: jonhealy1

stac_fastapi/elasticsearch/tests/api/test_api.py

@@ -115,6 +115,13 @@ async def test_app_fields_extension(app_client, ctx, txn_client):
     assert list(resp_json["features"][0]["properties"]) == ["datetime"]
 
 
+async def test_app_fields_extension_query(app_client, ctx, txn_client):
+    resp = await app_client.post("/search", json={"query": {"proj:epsg": {"gte": ctx.item["properties"]["proj:epsg"]}}, "collections": ["test-collection"]})
+    assert resp.status_code == 200
+    resp_json = resp.json()
+    assert list(resp_json["features"][0]["properties"]) == ["datetime", "proj:epsg"]
+
+
 async def test_app_fields_extension_no_properties_get(app_client, ctx, txn_client):
     resp = await app_client.get(
         "/search", params={"collections": ["test-collection"], "fields": "-properties"}