Add soft level errors distinction for PHPMail method

[MAILPOET-1154]

tests/unit/Mailer/Methods/ErrorMappers/PHPMailMapperTest.php

@@ -0,0 +1,34 @@
+<?php
+namespace MailPoet\Test\Mailer\Methods\ErrorMappers;
+
+use MailPoet\Mailer\MailerError;
+use MailPoet\Mailer\Methods\ErrorMappers\PHPMailMapper;
+
+class PHPMailMapperTest extends \MailPoetTest {
+
+  /** @var PHPMailMapper*/
+  private $mapper;
+
+  function _before() {
+    $this->mapper = new PHPMailMapper();
+  }
+
+  function testGetProperErrorForSubscriber() {
+    $error = $this->mapper->getErrorForSubscriber('john@rambo.com', []);
+    expect($error->getLevel())->equals(MailerError::LEVEL_HARD);
+    expect($error->getMessage())->equals('PHPMail has returned an unknown error.');
+    expect($error->getSubscriberErrors()[0]->getEmail())->equals('john@rambo.com');
+  }
+
+  function testGetProperErrorFromException() {
+    $error = $this->mapper->getErrorFromException(new \Exception('Some message'), 'john@rambo.com', []);
+    expect($error->getLevel())->equals(MailerError::LEVEL_HARD);
+    expect($error->getMessage())->equals('Some message');
+    expect($error->getSubscriberErrors()[0]->getEmail())->equals('john@rambo.com');
+  }
+
+  function testGetSoftErrorFromExceptionForInvalidEmail() {
+    $error = $this->mapper->getErrorFromException(new \Exception('Invalid address. (Add ...'), 'john@rambo.com', []);
+    expect($error->getLevel())->equals(MailerError::LEVEL_SOFT);
+  }
+}