fix tests for elasticsearch

Author: eimrek

optimade/server/create_app.py

@@ -139,8 +139,8 @@ def insert_index_data(
 
     links_coll = entry_collections["links"]
 
-    if links_coll.collection.estimated_document_count() > 0:
-        LOGGER.info("Skipping index links insert: links collection already populated.")
+    if len(links_coll) > 0:
+        LOGGER.info("Skipping index links inserct: links collection already populated.")
         return
 
     LOGGER.debug("Loading index links...")

tests/server/entry_collections/test_indexes.py

@@ -1,7 +1,15 @@
 import pytest
 from bson import ObjectId
 
+from optimade.server.config import ServerConfig
 
+CONFIG = ServerConfig()
+
+
+@pytest.mark.skipif(
+    CONFIG.database_backend.value not in ("mongomock", "mongodb"),
+    reason="Skipping index test when testing the elasticsearch backend.",
+)
 def test_indexes_are_created_where_appropriate(client):
     """Test that with the test config, default indices are made by
     supported backends. This is tested by checking that we cannot insert

tests/server/test_mappers.py

@@ -4,7 +4,13 @@
 from optimade.server.config import ServerConfig
 from optimade.server.mappers import BaseResourceMapper
 
+CONFIG = ServerConfig()
 
+
+@pytest.mark.skipif(
+    CONFIG.database_backend.value not in ("mongomock", "mongodb"),
+    reason="Skipping mongo-related test when testing the elasticsearch backend.",
+)
 def test_disallowed_aliases():
     from optimade.server.entry_collections.mongo import MongoCollection
 
@@ -14,7 +20,7 @@ class MyMapper(BaseResourceMapper):
 
     mapper = MyMapper()
     with pytest.raises(RuntimeError):
-        MongoCollection("fake", StructureResource, mapper, config=ServerConfig())
+        MongoCollection("fake", StructureResource, mapper, config=CONFIG)
 
 
 def test_property_aliases():