() {     $user0 = $this->drupalCreateUser();     $user0 = $this->drupalCreateUser();     $this->drupalLogin($user0);      // Create group and group content node types.     $group_type = $this->drupalCreateContentType();     og_create_field(OG_GROUP_FIELD, 'node', $group_type->type);     og_create_field(OG_ACCESS_FIELD, 'node', $group_type->type);      $group_content_type = $this->drupalCreateContentType();     og_create_field(OG_AUDIENCE_FIELD, 'node', $group_content_type->type);     og_create_field(OG_CONTENT_ACCESS_FIELD, 'node', $group_content_type->type);      // Create a group node and 