simple test for validation builder

tests/emmet-builders/test_vasp.py

@@ -0,0 +1,23 @@
+import pytest
+from maggma.stores import JSONStore, MemoryStore
+from emmet.builders.vasp.task_validator import TaskValidator
+
+
+intermediate_stores = ["validation"]
+
+
+@pytest.fixture(scope="session")
+def tasks_store(test_dir):
+    return JSONStore(test_dir / "test_si_tasks.json.gz")
+
+
+@pytest.fixture(scope="session")
+def validation_store():
+    return MemoryStore()
+
+
+def test_validator(tasks_store, validation_store):
+    builder = TaskValidator(tasks=tasks_store, task_validation=validation_store)
+    builder.run()
+    assert validation_store.count() == tasks_store.count()
+    assert validation_store.count({"valid": True}) == tasks_store.count()