Added boilerplate parameter for Nested blocks spec + test

tests/integration/test_studio_editable.py

@@ -355,7 +355,7 @@ class XBlockWithNested(StudioContainerWithNestedXBlocksMixin, XBlock):
     def allowed_nested_blocks(self):
         return [
             EditableXBlock,
-            NestedXBlockSpec(FancyBlockShim, single_instance=True)
+            NestedXBlockSpec(FancyBlockShim, single_instance=True, boilerplate="fancy-boiler")
         ]
 
 
@@ -378,12 +378,13 @@ class StudioContainerWithNestedXBlocksTest(StudioContainerWithNestedXBlocksBaseT
 
         self.addCleanup(patcher.stop)
 
-    def _check_button(self, button, category, label, single, disabled, disabled_reason=''):
+    def _check_button(self, button, category, label, single, disabled, disabled_reason='', boilerplate=None):
         self.assertEqual(button.get_attribute('data-category'), category)
         self.assertEqual(button.text, label)
         self.assertEqual(button.get_attribute('data-single-instance'), str(single).lower())
         self._assert_disabled(button, disabled)
         self.assertEqual(button.get_attribute('title'), disabled_reason)
+        self.assertEqual(button.get_attribute('data-boilerplate'), boilerplate)
 
     def _assert_disabled(self, button, disabled):
         if disabled:
@@ -405,7 +406,9 @@ class StudioContainerWithNestedXBlocksTest(StudioContainerWithNestedXBlocksBaseT
         self.assertEqual(len(add_buttons), 2)
         button_editable, button_fancy = add_buttons
         self._check_button(button_editable, EditableXBlock.CATEGORY, EditableXBlock.STUDIO_LABEL, False, False)
-        self._check_button(button_fancy, FancyBlockShim.CATEGORY, FancyBlockShim.STUDIO_LABEL, True, False)
+        self._check_button(
+            button_fancy, FancyBlockShim.CATEGORY, FancyBlockShim.STUDIO_LABEL, True, False, boilerplate="fancy-boiler"
+        )
 
     @XBlock.register_temp_plugin(XBlockWithDisabledNested, "nested")
     def test_author_edit_view_nested_with_disabled(self):

xblockutils/studio_editable.py

@@ -335,11 +335,12 @@ class NestedXBlockSpec(object):
     Class that allows detailed specification of allowed nested XBlocks. For use with
     StudioContainerWithNestedXBlocksMixin.allowed_nested_blocks
     """
-    def __init__(self, block, single_instance=False, disabled=False, disabled_reason=None):
+    def __init__(self, block, single_instance=False, disabled=False, disabled_reason=None, boilerplate=None):
         self._block = block
         self._single_instance = single_instance
         self._disabled = disabled
         self._disabled_reason = disabled_reason
+        self._boilerplate = boilerplate
 
     @property
     def category(self):
@@ -371,6 +372,11 @@ class NestedXBlockSpec(object):
         """
         return self._disabled_reason
 
+    @property
+    def boilerplate(self):
+        """ Boilerplate - if not None and not empty used as data-boilerplate attribute value """
+        return self._boilerplate
+
 
 class XBlockWithPreviewMixin(object):
     """

xblockutils/templates/add_buttons.html

@@ -11,6 +11,7 @@
              {% if block_spec.disabled %}
               disabled="disabled" title="{{ block_spec.disabled_reason }}"
              {% endif %}
+             {% if block_spec.boilerplate %} data-boilerplate="{{ block_spec.boilerplate }}"  {% endif %}
               >
             {{ block_spec.label }}
           </a>