public ThemeManagerInterface::setActiveTheme(ActiveTheme $active_theme)
Sets the current active theme manually.
Note: This method should not be used in common cases, just in special cases like tests.
\Drupal\Core\Theme\ActiveTheme $active_theme: The new active theme.
$this
public function setActiveTheme(ActiveTheme $active_theme);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Theme!ThemeManagerInterface.php/function/ThemeManagerInterface::setActiveTheme/8.1.x