Add integration test for SendingThrottlingHandler

[MAILPOET-3588]

tests/integration/Cron/Workers/SendingQueue/SendingThrottlingHandlerTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace MailPoet\Test\Cron\Workers;
+
+use MailPoet\Cron\Workers\SendingQueue\SendingThrottlingHandler;
+use MailPoet\Settings\SettingsController;
+
+class SendingThrottlingHandlerTest extends \MailPoetTest {
+
+  /** @var SendingThrottlingHandler */
+  private $throttlingHandler;
+
+  /** @var SettingsController */
+  private $settings;
+
+  public function _before() {
+    parent::_before();
+    $this->throttlingHandler = $this->diContainer->get(SendingThrottlingHandler::class);
+    $this->settings = $this->diContainer->get(SettingsController::class);
+  }
+
+  public function testItReturnsDefaultBatchSize(): void {
+    $batchSize = $this->throttlingHandler->getBatchSize();
+    expect($batchSize)->equals(SendingThrottlingHandler::BATCH_SIZE);
+  }
+
+  public function testItThrottlesBatchSizeToHalf(): void {
+    $batchSize = $this->throttlingHandler->getBatchSize();
+    expect($batchSize)->equals(SendingThrottlingHandler::BATCH_SIZE);
+    expect($this->throttlingHandler->throttleBatchSize())->equals($batchSize / 2);
+  }
+
+  public function testItIncreaseSuccessRequestCountInRow(): void {
+    $this->throttlingHandler->throttleBatchSize();
+    $this->throttlingHandler->processSuccess();
+    $throttlingSettings = $this->settings->get(SendingThrottlingHandler::SETTINGS_KEY);
+    expect($throttlingSettings['success_in_row'])->equals(1);
+  }
+}