Add test for task order form

tests/forms/test_task_order_form.py

@@ -0,0 +1,9 @@
+import pytest
+from wtforms import Form
+
+from atst.forms.task_order import AppInfoForm
+
+def test_complexity():
+    form  = AppInfoForm(formdata={"complexity":["other", "not_sure", "storage"]})
+
+    assert form.data["complexity"] == ["other", "not_sure", "storage"]