Add server side reset handler

drag_and_drop_v2/drag_and_drop_v2.py

@@ -205,6 +205,10 @@ class DragAndDropBlock(XBlock):
             'feedback': item['feedback']['correct'] if is_correct else item['feedback']['incorrect']
         }
 
+    @XBlock.handler
+    def reset(self, request, suffix=''):
+        self.item_state = {}
+
     def _is_finished(self):
         """All items are at their correct place"""
         tot_items = sum(1 for i in self.data['items'] if i['zone'] != 'none')

tests/test_drag_and_drop_v2.py

@@ -11,8 +11,8 @@ from workbench.runtime import WorkbenchRuntime
 from xblock.runtime import KvsFieldData, DictKeyValueStore
 
 from nose.tools import (
-    assert_equals, assert_true, assert_in,
-    assert_regexp_matches
+    assert_equals, assert_true, assert_false,
+    assert_in, assert_regexp_matches
 )
 
 import drag_and_drop_v2
@@ -155,3 +155,21 @@ def test_ajax():
         get_data = json.loads(block.handle('get_data', Mock()).body)
         assert_equals(expected, get_data)
 
+def test_ajax_solve_and_reset():
+    block = make_block()
+
+    assert_false(block.completed)
+    assert_equals(block.item_state, {})
+
+    data = json.dumps({"val":0,"zone":"Zone A","top":"11px","left":"111px"})
+    block.handle('do_attempt', make_request(data))
+    data = json.dumps({"val":1,"zone":"Zone B","top":"22px","left":"222px"})
+    block.handle('do_attempt', make_request(data))
+
+    assert_true(block.completed)
+    assert_equals(block.item_state, {0:("11px", "111px"), 1:("22px", "222px")})
+
+    block.handle('reset', make_request(""))
+
+    assert_true(block.completed)
+    assert_equals(block.item_state, {})