Method register

src/_pytest/config/__init__.py:560–583

(self, plugin: _PluggyPlugin, name: str | None = None)

        return opts

    def register(self, plugin: _PluggyPlugin, name: str | None = None) -> str | None:
        if name in _pytest.deprecated.DEPRECATED_EXTERNAL_PLUGINS:
            warnings.warn(
                PytestConfigWarning(
                    class="st">"{} plugin has been merged into the core, "
                    class="st">"please remove it from your requirements.".format(
                        name.replace(class="st">"_", class="st">"-")
                    )
                )
            )
            return None
        plugin_name = super().register(plugin, name)
        if plugin_name is not None:
            self.hook.pytest_plugin_registered.call_historic(
                kwargs=dict(
                    plugin=plugin,
                    plugin_name=plugin_name,
                    manager=self,
                )
            )

            if isinstance(plugin, types.ModuleType):
                self.consider_module(plugin)
        return plugin_name

    def getplugin(self, name: str):
        class="cm"># Support deprecated naming because plugins (xdist e.g.) use it.