Add PluginManager.unblock method to unblock a name

src/pluggy/_manager.py

@@ -235,6 +235,16 @@
  """Return whether the given plugin name is blocked."""
  return name in self._name2plugin and self._name2plugin[name] is None
 
+ def unblock(self, name: str) -> bool:
+ """Unblocks a name.
+
+ Returns whether the name was actually blocked.
+ """
+ if self._name2plugin.get(name, -1) is None:
+ del self._name2plugin[name]
+ return True
+ return False
+
  def add_hookspecs(self, module_or_class: _Namespace) -> None:
  """Add new hook specifications defined in the given ``module_or_class``.
 

testing/test_pluginmanager.py

@@ -110,6 +110,13 @@ class A:
  pm.unregister(name="somename")
  assert pm.is_blocked("somename")
 
+ # Unblock.
+ assert not pm.unblock("someothername")
+ assert pm.unblock("somename")
+ assert not pm.is_blocked("somename")
+ assert not pm.unblock("somename")
+ assert pm.register(A(), "somename")
+
 
 def test_register_mismatch_method(he_pm: PluginManager) -> None:
  class hello: