BUG#AC-3157: Grouped product with tax throws exception with PHP 8.1

Author: glo80326

app/code/Magento/Tax/Test/Unit/Pricing/Render/AdjustmentTest.php

@@ -372,7 +372,7 @@ public function testGetDataPriceType(): void
         $this->assertEquals('basePrice', $this->model->getDataPriceType());
         $amountRender->expects($this->atLeastOnce())
             ->method('getPriceType')
-            ->willReturn('anythingElse');
+            ->willReturn(null);
         $this->model->render($amountRender, []);
         //no exception thrown
         $this->assertIsString($this->model->getDataPriceType());