Index: tests/test_collection.py
===================================================================
--- tests/test_collection.py	(revision 376e21b3865f5979339d98773fc106b2673d35a9)
+++ tests/test_collection.py	(revision 376e21b3865f5979339d98773fc106b2673d35a9)
@@ -0,0 +1,19 @@
+from flexoentity import FlexoCollection, Domain
+
+
+def test_collection_basic():
+    c = FlexoCollection()
+    assert len(c) == 0
+
+    e1 = Domain.with_domain_id("WIP_TEST")
+    e2 = Domain.with_domain_id("TEST_WIP")
+
+    c.add(e1)
+    c.add(e2)
+
+    assert len(c) == 2
+    assert e1.flexo_id in c
+    assert c.get(e1.flexo_id) is e1
+
+    c.remove(e1.flexo_id)
+    assert len(c) == 1