Added test and fix minor issue

Author: Usik2203

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 +117,34 @@ public function testGetLowestPriceForGuest()
         $this->assertEquals(round(7.25, 2), $this->getValueForQuantity(8, $itemTiers));
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/three_simple_products_with_tier_price.php
+     */
+    public function testGetCorrectDisplaingTierPriceForProducts()
+    {
+        $productSku = 'simple';
+        $query =  <<<QUERY
+{
+  products(search: "{$productSku}") {
+   items {
+        id
+        name
+          price_tiers {
+              quantity
+              final_price {
+                  value
+              }
+          }
+      }
+  }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+        $this->assertCount(1, $response['products']['items'][0]['price_tiers']);
+        $this->assertCount(1, $response['products']['items'][1]['price_tiers']);
+        $this->assertCount(1, $response['products']['items'][2]['price_tiers']);
+    }
+
     /**
      * Get the tier price value for the given product quantity
      *