diff --git a/tests/unit/payment-methods/test-class-upe-payment-gateway.php b/tests/unit/payment-methods/test-class-upe-payment-gateway.php
index eca7d435c14..137a283a944 100644
--- a/tests/unit/payment-methods/test-class-upe-payment-gateway.php
+++ b/tests/unit/payment-methods/test-class-upe-payment-gateway.php
@@ -171,6 +171,13 @@ class UPE_Payment_Gateway_Test extends WCPAY_UnitTestCase {
 	 */
 	private $mock_fraud_service;
 
+	/**
+	 * Mock Duplicates Detection Service.
+	 *
+	 * @var Duplicates_Detection_Service
+	 */
+	private $mock_duplicates_detection_service;
+
 	/**
 	 * Pre-test setup
 	 */
@@ -231,8 +238,9 @@ public function set_up() {
 
 		$this->mock_dpps = $this->createMock( Duplicate_Payment_Prevention_Service::class );
 
-		$this->mock_localization_service = $this->createMock( WC_Payments_Localization_Service::class );
-		$this->mock_fraud_service        = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_localization_service         = $this->createMock( WC_Payments_Localization_Service::class );
+		$this->mock_fraud_service                = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_duplicates_detection_service = $this->createMock( Duplicates_Detection_Service::class );
 
 		$this->mock_payment_methods = [];
 		$payment_method_classes     = [
@@ -295,7 +303,7 @@ public function set_up() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->setMethods(
@@ -950,7 +958,6 @@ public function test_get_upe_available_payment_methods( $payment_methods, $expec
 			->expects( $this->any() )
 			->method( 'get_fees' )
 			->willReturn( $payment_methods );
-		$mock_duplicates_detection_service = $this->createMock( Duplicates_Detection_Service::class );
 
 		$gateway = new WC_Payment_Gateway_WCPay(
 			$this->mock_api_client,
@@ -965,7 +972,7 @@ public function test_get_upe_available_payment_methods( $payment_methods, $expec
 			$this->mock_dpps,
 			$this->mock_localization_service,
 			$this->mock_fraud_service,
-			$mock_duplicates_detection_service
+			$this->mock_duplicates_detection_service
 		);
 
 		$this->assertEquals( $expected_result, $gateway->get_upe_available_payment_methods() );
diff --git a/tests/unit/payment-methods/test-class-upe-split-payment-gateway.php b/tests/unit/payment-methods/test-class-upe-split-payment-gateway.php
index 5c305d09662..8ac1db139a5 100644
--- a/tests/unit/payment-methods/test-class-upe-split-payment-gateway.php
+++ b/tests/unit/payment-methods/test-class-upe-split-payment-gateway.php
@@ -159,6 +159,13 @@ class UPE_Split_Payment_Gateway_Test extends WCPAY_UnitTestCase {
 	 */
 	private $mock_fraud_service;
 
+		/**
+		 * Mock Duplicates Detection Service.
+		 *
+		 * @var Duplicates_Detection_Service
+		 */
+	private $mock_duplicates_detection_service;
+
 	/**
 	 * Mapping for payment ID to payment method.
 	 *
@@ -248,8 +255,9 @@ public function set_up() {
 
 		$this->mock_dpps = $this->createMock( Duplicate_Payment_Prevention_Service::class );
 
-		$this->mock_localization_service = $this->createMock( WC_Payments_Localization_Service::class );
-		$this->mock_fraud_service        = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_localization_service         = $this->createMock( WC_Payments_Localization_Service::class );
+		$this->mock_fraud_service                = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_duplicates_detection_service = $this->createMock( Duplicates_Detection_Service::class );
 
 		// Arrange: Define a $_POST array which includes the payment method,
 		// so that get_payment_method_from_request() does not throw error.
@@ -282,7 +290,7 @@ public function set_up() {
 						$this->mock_dpps,
 						$this->mock_localization_service,
 						$this->mock_fraud_service,
-						$this->createMock( Duplicates_Detection_Service::class ),
+						$this->mock_duplicates_detection_service,
 					]
 				)
 				->setMethods(
@@ -1062,7 +1070,7 @@ public function test_get_payment_methods_with_request_context() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->setMethods( [ 'get_payment_methods_from_gateway_id' ] )
@@ -1108,7 +1116,7 @@ public function test_get_payment_methods_without_request_context() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->setMethods( [ 'get_payment_methods_from_gateway_id' ] )
@@ -1153,7 +1161,7 @@ public function test_get_payment_methods_without_request_context_or_token() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->setMethods(
@@ -1207,7 +1215,7 @@ public function test_get_payment_methods_from_gateway_id_upe() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->onlyMethods(
diff --git a/tests/unit/test-class-wc-payment-gateway-wcpay-subscriptions.php b/tests/unit/test-class-wc-payment-gateway-wcpay-subscriptions.php
index 4e50568e8b6..151b3b919fe 100644
--- a/tests/unit/test-class-wc-payment-gateway-wcpay-subscriptions.php
+++ b/tests/unit/test-class-wc-payment-gateway-wcpay-subscriptions.php
@@ -103,6 +103,13 @@ class WC_Payment_Gateway_WCPay_Subscriptions_Test extends WCPAY_UnitTestCase {
 	 */
 	private $mock_fraud_service;
 
+	/**
+	 * Mock Duplicates Detection Service.
+	 *
+	 * @var Duplicates_Detection_Service
+	 */
+	private $mock_duplicates_detection_service;
+
 	public function set_up() {
 		parent::set_up();
 
@@ -137,8 +144,9 @@ public function set_up() {
 
 		$this->mock_dpps = $this->createMock( Duplicate_Payment_Prevention_Service::class );
 
-		$this->mock_localization_service = $this->createMock( WC_Payments_Localization_Service::class );
-		$this->mock_fraud_service        = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_localization_service         = $this->createMock( WC_Payments_Localization_Service::class );
+		$this->mock_fraud_service                = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_duplicates_detection_service = $this->createMock( Duplicates_Detection_Service::class );
 
 		$mock_payment_method = $this->getMockBuilder( CC_Payment_Method::class )
 			->setConstructorArgs( [ $this->mock_token_service ] )
@@ -158,7 +166,7 @@ public function set_up() {
 			$this->mock_dpps,
 			$this->mock_localization_service,
 			$this->mock_fraud_service,
-			$this->createMock( Duplicates_Detection_Service::class ),
+			$this->mock_duplicates_detection_service,
 		);
 		$this->wcpay_gateway->init_hooks();
 		WC_Payments::set_gateway( $this->wcpay_gateway );
@@ -832,7 +840,8 @@ public function test_adds_custom_payment_meta_input_fallback_until_subs_3_0_7()
 			$this->order_service,
 			$this->mock_dpps,
 			$this->mock_localization_service,
-			$this->mock_fraud_service
+			$this->mock_fraud_service,
+			$this->mock_duplicates_detection_service,
 		);
 
 		// Ensure the has_attached_integration_hooks property is set to false so callbacks can be attached in maybe_init_subscriptions().
@@ -866,7 +875,8 @@ public function test_does_not_add_custom_payment_meta_input_fallback_for_subs_3_
 			$this->order_service,
 			$this->mock_dpps,
 			$this->mock_localization_service,
-			$this->mock_fraud_service
+			$this->mock_fraud_service,
+			$this->mock_duplicates_detection_service,
 		);
 
 		$this->assertFalse( has_action( 'woocommerce_admin_order_data_after_billing_address' ) );
diff --git a/tests/unit/test-class-wc-payment-gateway-wcpay.php b/tests/unit/test-class-wc-payment-gateway-wcpay.php
index e28fc51612d..c485a19ecb3 100644
--- a/tests/unit/test-class-wc-payment-gateway-wcpay.php
+++ b/tests/unit/test-class-wc-payment-gateway-wcpay.php
@@ -178,6 +178,13 @@ class WC_Payment_Gateway_WCPay_Test extends WCPAY_UnitTestCase {
 	 */
 	private $mock_fraud_service;
 
+		/**
+		 * Mock Duplicates Detection Service.
+		 *
+		 * @var Duplicates_Detection_Service
+		 */
+	private $mock_duplicates_detection_service;
+
 	/**
 	 * Pre-test setup
 	 */
@@ -230,7 +237,8 @@ public function set_up() {
 					'currency_code' => 'usd',
 				]
 			);
-		$this->mock_fraud_service = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_fraud_service                = $this->createMock( WC_Payments_Fraud_Service::class );
+		$this->mock_duplicates_detection_service = $this->createMock( Duplicates_Detection_Service::class );
 
 		$this->mock_payment_method = $this->getMockBuilder( CC_Payment_Method::class )
 			->setConstructorArgs( [ $this->mock_token_service ] )
@@ -898,7 +906,7 @@ public function test_process_redirect_setup_intent_succeded() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->onlyMethods(
@@ -1006,7 +1014,7 @@ public function test_process_redirect_payment_save_payment_token() {
 					$this->mock_dpps,
 					$this->mock_localization_service,
 					$this->mock_fraud_service,
-					$this->createMock( Duplicates_Detection_Service::class ),
+					$this->mock_duplicates_detection_service,
 				]
 			)
 			->onlyMethods(
@@ -3206,7 +3214,7 @@ private function get_partial_mock_for_gateway( array $methods = [], array $const
 			$this->mock_dpps,
 			$this->mock_localization_service,
 			$this->mock_fraud_service,
-			$this->createMock( Duplicates_Detection_Service::class ),
+			$this->mock_duplicates_detection_service,
 		];
 
 		foreach ( $constructor_replacement as $key => $value ) {
@@ -3693,7 +3701,7 @@ private function init_gateways() {
 				$this->mock_dpps,
 				$this->mock_localization_service,
 				$this->mock_fraud_service,
-				$this->createMock( Duplicates_Detection_Service::class )
+				$this->mock_duplicates_detection_service
 			);
 		}