TST: Add unittest for loading identifiables from a yaml file

unittests/test_directories/single_file_test_data/identifiables.yml

+Person:
+  - full_name
+Keyword:
+  - name
+Project:
+  - project_id
+  - title

unittests/test_identifiable_adapters.py

@@ -27,8 +27,10 @@
 test identifiable_adapters module
 """
 
+import os
 from datetime import datetime
-from newcrawler.identifiable_adapters import IdentifiableAdapter
+from newcrawler.identifiable_adapters import (
+    CaosDBIdentifiableAdapter, IdentifiableAdapter)
 import caosdb as db
 
 
@@ -57,3 +59,27 @@ def test_create_query_for_identifiable():
     query = IdentifiableAdapter.create_query_for_identifiable(
         db.Record(name="TestRecord").add_parent("TestType"))
     assert query.lower() == "find record testtype with name='testrecord'"
+
+
+def test_load_from_yaml_file():
+    ident = CaosDBIdentifiableAdapter()
+    ident.load_from_yaml_definition(
+        os.path.join(os.path.dirname(__file__), "test_directories",
+                     "single_file_test_data", "identifiables.yml")
+    )
+
+    person_i = ident.get_registered_identifiable(
+        db.Record().add_parent("Person"))
+    assert person_i is not None
+    assert person_i.get_property("full_name") is not None
+
+    keyword_i = ident.get_registered_identifiable(
+        db.Record().add_parent("Keyword"))
+    assert keyword_i is not None
+    assert keyword_i.get_property("name") is not None
+
+    project_i = ident.get_registered_identifiable(
+        db.Record().add_parent("Project"))
+    assert project_i is not None
+    assert project_i.get_property("project_id") is not None
+    assert project_i.get_property("title") is not None