ensure datasources are always DataSource objects

rolltable/tables.py

@@ -267,11 +267,11 @@ class RollTable:
         self._data = []
         for src in self._sources:
             if type(src) is str:
-                ds = DataSource(src, frequency=self._frequency)
+                src = [src]
+            for one_source in src:
+                ds = DataSource(one_source, frequency=self._frequency)
                 ds.load_source()
                 self._data.append(ds)
-            else:
-                self._data.append(src)
 
         # merge the headers
         self._headers = []

tests/test_tables.py

@@ -205,5 +205,6 @@ def test_text():
 
 
 def test_as_dict():
-    ds = tables.RollTable([fixture_metadata + fixture_source]).datasources[0].as_dict()
-    assert ds['Option 1']['Header 1'] == 'Option 1'
+    source = tables.RollTable([fixture_no_descriptions]).datasources[0]
+    ds = source.as_dict()
+    assert ds['option 1']['choice'] == 'choice 1'