ENGCOM-8985: [32279][GraphQL] Fixed issue with tier price #32353

 - Merge Pull Request #32353 from Usik2203/magento2:32279-issue-with-tier-price
 - Merged commits:
   1. 3359cfa
   2. 706d2ec
   3. 457b0ea
   4. d5c4191
   5. 022d7bf
   6. 60e258f
   7. f494cb1
   8. 5590d7c

Author: magento-engcom-team

app/code/Magento/CatalogCustomerGraphQl/Model/Resolver/PriceTiers.php

@@ -19,7 +19,6 @@
 use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Framework\Pricing\PriceCurrencyInterface;
-use Magento\Store\Api\Data\StoreInterface;
 
 /**
  * Resolver for price_tiers
@@ -125,6 +124,10 @@ public function resolve(
             return [];
         }
 
+        if (!$product->getTierPrices()) {
+            return [];
+        }
+
         $productId = (int)$product->getId();
         $this->tiers->addProductFilter($productId);
 
@@ -152,7 +155,8 @@ private function formatAndFilterTierPrices(
         array $tierPrices,
         string $currencyCode
     ): array {
-
+        $this->formatAndFilterTierPrices = [];
+        $this->tierPricesQty = [];
         foreach ($tierPrices as $key => $tierPrice) {
             $tierPrice->setValue($this->priceCurrency->convertAndRound($tierPrice->getValue()));
             $this->formatTierPrices($productPrice, $currencyCode, $tierPrice);

app/code/Magento/CatalogCustomerGraphQl/composer.json

@@ -7,8 +7,7 @@
         "magento/framework": "*",
         "magento/module-catalog": "*",
         "magento/module-customer": "*",
-        "magento/module-catalog-graph-ql": "*",
-        "magento/module-store": "*"
+        "magento/module-catalog-graph-ql": "*"
     },
     "license": [
         "OSL-3.0",

dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogCustomer/PriceTiersTest.php

@@ -117,6 +117,41 @@ public function testGetLowestPriceForGuest()
         $this->assertEquals(round(7.25, 2), $this->getValueForQuantity(8, $itemTiers));
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/second_product_simple.php
+     * @magentoApiDataFixture Magento/Catalog/_files/three_simple_products_with_tier_price.php
+     */
+    public function testProductTierPricesAreCorrectlyReturned()
+    {
+        $productSku = 'simple';
+        $query =  <<<QUERY
+{
+  products(search: "{$productSku}") {
+   items {
+        sku
+        name
+          price_tiers {
+              quantity
+              final_price {
+                  value
+              }
+          }
+      }
+  }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+        $productsWithTierPrices = ['simple_1','simple_2','simple_3'];
+
+        foreach ($response['products']['items'] as $key => $item) {
+            if (in_array($item['sku'], $productsWithTierPrices)) {
+                $this->assertCount(1, $response['products']['items'][$key]['price_tiers']);
+            } else {
+                $this->assertCount(0, $response['products']['items'][$key]['price_tiers']);
+            }
+        }
+    }
+
     /**
      * Get the tier price value for the given product quantity
      *