You can pass a distribution_name to factory.addPloneSite.

We then pass all other arguments and keyword arguments to the `plone.distribution` site api.

Products/CMFPlone/factory.py

@@ -138,8 +138,34 @@ def addPloneSite(
     setup_content=None,
     default_language="en",
     portal_timezone="UTC",
+    distribution_name=None,
+    **kwargs,
 ):
     """Add a PloneSite to the context."""
+    if distribution_name:
+        from plone.distribution.api import site as site_api
+
+        # Pass all arguments and keyword arguments in the answers,
+        # But the 'distribution_name' is not needed there.
+        answers = {
+            "site_id": site_id,
+            "title": title,
+            "description": description,
+            "profile_id": profile_id,
+            "snapshot": snapshot,
+            "content_profile_id": content_profile_id,
+            "extension_ids": extension_ids,
+            "setup_content": setup_content,
+            "default_language": default_language,
+            "portal_timezone": portal_timezone,
+        }
+        answers.update(kwargs)
+        site = site_api._create_site(
+            context=context, distribution_name=distribution_name, answers=answers
+        )
+        setSite(site)
+        return site
+
     if content_profile_id is not None:
         warnings.warn(
             "addPloneSite ignores the content_profile_id keyword argument "

Products/CMFPlone/tests/configure.zcml

@@ -1,6 +1,8 @@
 <configure
     xmlns="http://namespaces.zope.org/zope"
     xmlns:browser="http://namespaces.zope.org/browser"
+    xmlns:plone="http://namespaces.plone.org/plone"
+    xmlns:zcml="http://namespaces.zope.org/zcml"
     i18n_domain="plone"
     >
 
@@ -11,4 +13,14 @@
       permission="zope2.View"
       />
 
+  <configure zcml:condition="installed plone.distribution">
+    <include package="plone.distribution" />
+    <plone:distribution
+        name="testdistro"
+        title="Plone Site"
+        headless="false"
+        post_handler="plone.distribution.handler.post_handler"
+        />
+  </configure>
+
 </configure>

Products/CMFPlone/tests/test_factory.py

@@ -1,3 +1,4 @@
+from importlib.metadata import distribution
 from plone.dexterity.interfaces import IDexterityFTI
 from plone.registry.interfaces import IRegistry
 from Products.CMFPlone.factory import addPloneSite
@@ -9,6 +10,13 @@
 import unittest
 
 
+try:
+    distribution("plone.distribution")
+    HAS_DISTRIBUTION = True
+except PackageNotFoundError:
+    HAS_DISTRIBUTION = False
+
+
 class TestFactoryPloneSite(unittest.TestCase):
     layer = PRODUCTS_CMFPLONE_INTEGRATION_TESTING
 
@@ -67,3 +75,20 @@ def test_site_creation_title_is_set_in_registry(self):
         ploneSite = addPloneSite(self.app, "ploneFoo", title="Foo")
         registry = getUtility(IRegistry, context=ploneSite)
         self.assertEqual(registry["plone.site_title"], "Foo")
+
+    @unittest.skipIf(
+        not HAS_DISTRIBUTION,
+        "Passing a distribution_name needs plone.distribution.",
+    )
+    def test_site_creation_distribution(self):
+        """Create a Plone Site using a distribution"""
+        ploneSite = addPloneSite(
+            self.app,
+            "ploneFoo",
+            title="Foo",
+            distribution_name="testdistro",
+            default_language="nl",
+        )
+        self.assertEqual(ploneSite.getId(), "ploneFoo")
+        self.assertEqual(ploneSite.title, "Foo")
+        self.assertEqual(ploneSite.Language(), "nl")

news/3961.feature.1

@@ -0,0 +1,3 @@
+You can pass a `distribution_name` to `factory.addPloneSite`.
+We then pass all other arguments and keyword arguments to the `plone.distribution` site api.
+[maurits]