diff --git a/tests/unit/inc/addon-manager-test.php b/tests/unit/inc/addon-manager-test.php
index 9cddf533cde..62528d10d9e 100644
--- a/tests/unit/inc/addon-manager-test.php
+++ b/tests/unit/inc/addon-manager-test.php
@@ -1157,8 +1157,12 @@ public function test_create_notification( $product_name, $short_link ) {
 			]
 		);
 
+		$admin_user     = Mockery::mock( WP_User::class );
+		$admin_user->ID = 1;
+
 		Monkey\Functions\expect( 'wp_get_current_user' )
-			->twice();
+			->twice()
+			->andReturn( $admin_user );
 
 		Monkey\Functions\expect( 'YoastSEO' )
 			->once()
diff --git a/tests/unit/integrations/admin/indexing-notification-integration-test.php b/tests/unit/integrations/admin/indexing-notification-integration-test.php
index 7466eefedd8..256fe4d1848 100644
--- a/tests/unit/integrations/admin/indexing-notification-integration-test.php
+++ b/tests/unit/integrations/admin/indexing-notification-integration-test.php
@@ -344,8 +344,10 @@ public function test_maybe_create_notification_with_indexing_failed_reason() {
 			->once()
 			->andReturn( Indexing_Reasons::REASON_INDEXING_FAILED );
 
+		$admin_user     = Mockery::mock( WP_User::class );
+		$admin_user->ID = 1;
 		Monkey\Functions\expect( 'wp_get_current_user' )
-			->andReturn( 'user' );
+			->andReturn( $admin_user );
 
 		$this->notification_helper
 			->expects( 'restore_notification' )
@@ -400,8 +402,10 @@ public function test_maybe_create_notification_with_indexing_reasons( $reason )
 			->once()
 			->andReturn( $reason );
 
+		$admin_user     = Mockery::mock( WP_User::class );
+		$admin_user->ID = 1;
 		Monkey\Functions\expect( 'wp_get_current_user' )
-			->andReturn( 'user' );
+			->andReturn( $admin_user );
 
 		$this->notification_helper
 			->expects( 'restore_notification' )
diff --git a/tests/unit/integrations/third-party/wpml-wpseo-notification-test.php b/tests/unit/integrations/third-party/wpml-wpseo-notification-test.php
index d4799c20903..0dcfea3183d 100644
--- a/tests/unit/integrations/third-party/wpml-wpseo-notification-test.php
+++ b/tests/unit/integrations/third-party/wpml-wpseo-notification-test.php
@@ -120,8 +120,10 @@ public function test_notifies_when_not_installed() {
 		// Mock that the Yoast SEO Multilingual plugin is not installed and activated.
 		$this->wpml_wpseo_conditional->expects( 'is_met' )->andReturnFalse();
 
+		$admin_user     = Mockery::mock( WP_User::class );
+		$admin_user->ID = 1;
 		Monkey\Functions\expect( 'wp_get_current_user' )
-			->andReturn( 'user' );
+			->andReturn( $admin_user );
 
 		$this->notification_center
 			->expects( 'add_notification' )