Added test that uses ProductPerformanceRequest.

tests/php/integration/ProductPerformanceTest.php

@@ -0,0 +1,40 @@
+<?php
+
+
+namespace Relewise\Tests\Integration;
+
+use Relewise\Analyzer;
+use Relewise\Models\ProductPerformanceRequest;
+use Relewise\Models\ProductPerformanceRequestOrderByOptions;
+use Relewise\Models\stringstringKeyValuePair;
+use Relewise\Models\ProductPerformanceResult;
+use Relewise\Tests\Integration\BaseTestCase;
+
+class ProductPerformanceTest extends BaseTestCase
+{
+    public function testProductPerformanceRequest(): void
+    {
+        $analyzer = new Analyzer($this->DATASET_ID(), $this->API_KEY());
+
+        $request = ProductPerformanceRequest::create(
+            language: null,
+            currency: null,
+            byVariant: false,
+            numberOfResultsPerRequest: 10,
+            skipNumberOfResults: 0
+        )->setOrderBy(ProductPerformanceRequestOrderByOptions::RankBySales)
+        ->setFromUnixTimeSeconds(time() - 60 * 60 * 24 * 30)
+        ->setToUnixTimeSeconds(time())
+        ->addToClassifications(stringstringKeyValuePair::create("Country", "DK"));
+
+        $response = $analyzer->productPerformance($request);
+
+        self::assertNotNull($response);
+        /** @var ProductPerformanceResult $first */
+        $first = $response->results[0];
+        /** @var ProductPerformanceResult $second */
+        $fifth = $response->results[4]; // This might be flaky. It is just to check that some element lower down has a smaller 
+
+        self::assertTrue($first->classifications[0]->sales->orders > $fifth->classifications[0]->sales->orders);
+    }
+}