Handle error message for exceeded email limit when limit is not known

[MAILPOET-5191]

mailpoet/lib/Mailer/Methods/ErrorMappers/MailPoetMapper.php

@@ -193,12 +193,21 @@ class MailPoetMapper {
     $partialApiKey = $this->servicesChecker->generatePartialApiKey();
     $emailVolumeLimit = $this->subscribersFeature->getEmailVolumeLimit();
     $date = Carbon::now()->startOfMonth()->addMonth();
+    if ($emailVolumeLimit) {
       $message = sprintf(
       // translators: %1$s is email volume limit and %2$s the date when you can resume sending.
-      __('You have sent more emails this month than your MailPoet plan includes (%1$s), and sending has been temporarily paused. To continue sending with MailPoet Sending Service please [link]upgrade your plan[/link], or wait until sending is automatically resumed on <b>%2$s</b>.', 'mailpoet'),
+        __('You have sent more emails this month than your MailPoet plan includes (%1$s), and sending has been temporarily paused. To continue sending with MailPoet Sending Service please [link]upgrade your plan[/link], or wait until sending is automatically resumed on %2$s.', 'mailpoet'),
         $emailVolumeLimit,
-      $this->wp->dateI18n(get_option('date_format'), $date->getTimestamp())
+        $this->wp->dateI18n($this->wp->getOption('date_format'), $date->getTimestamp())
       );
+    } else {
+      $message = sprintf(
+        // translators: %1$s the date when you can resume sending.
+        __('You have sent more emails this month than your MailPoet plan includes, and sending has been temporarily paused. To continue sending with MailPoet Sending Service please [link]upgrade your plan[/link], or wait until sending is automatically resumed on %1$s.', 'mailpoet'),
+        $this->wp->dateI18n($this->wp->getOption('date_format'), $date->getTimestamp())
+      );
+    }
+
     $message = Helpers::replaceLinkTags(
       $message,
       "https://account.mailpoet.com/orders/upgrade/{$partialApiKey}",

mailpoet/tests/unit/Mailer/Methods/ErrorMappers/MailPoetMapperTest.php

@@ -213,4 +213,56 @@ class MailPoetMapperTest extends \MailPoetUnitTest {
     expect($error->getLevel())->equals(MailerError::LEVEL_HARD);
     expect($error->getMessage())->equals('Email service is temporarily not available, please try again in a few minutes.');
   }
+
+  public function testGetErrorEmailVolumeLimitWithAndWithoutKnownLimit(): void {
+    $apiResult = [
+      'code' => API::RESPONSE_CODE_CAN_NOT_SEND,
+      'status' => API::SENDING_STATUS_SEND_ERROR,
+      'message' => API::ERROR_MESSAGE_EMAIL_VOLUME_LIMIT_REACHED,
+      'error' => API::ERROR_MESSAGE_EMAIL_VOLUME_LIMIT_REACHED,
+    ];
+
+    $wpFunctions = Stub::make(new WPFunctions, [
+      '_x' => function ($value) {
+        return $value;
+      },
+      'getOption' => '',
+      'dateI18n' => '2023-01-31',
+    ]);
+
+    $subscribersWithLimit = Stub::make(Subscribers::class, [
+      'getEmailVolumeLimit' => 1000,
+    ]);
+
+    $subscribersWithoutKnownLimit = Stub::make(Subscribers::class, [
+      'getEmailVolumeLimit' => 0,
+    ]);
+
+    $serviceChecker = Stub::make(ServicesChecker::class, [
+      'generatePartialApiKey' => 'abc',
+    ]);
+
+    // Check email volume error when the limit is known
+    $this->mapper = new MailPoetMapper(
+      $serviceChecker,
+      $subscribersWithLimit,
+      $wpFunctions
+    );
+    $error = $this->mapper->getErrorForResult($apiResult, $this->subscribers);
+    expect($error)->isInstanceOf(MailerError::class);
+    expect($error->getOperation())->equals(MailerError::OPERATION_EMAIL_LIMIT_REACHED);
+    expect($error->getLevel())->equals(MailerError::LEVEL_HARD);
+    expect($error->getMessage())->stringContainsString('You have sent more emails this month than your MailPoet plan includes (1000),');
+    expect($error->getMessage())->stringContainsString('wait until sending is automatically resumed on 2023-01-31');
+
+    // Check email volume error when the limit is unknown
+    $this->mapper = new MailPoetMapper(
+      $serviceChecker,
+      $subscribersWithoutKnownLimit,
+      $wpFunctions
+    );
+    $error = $this->mapper->getErrorForResult($apiResult, $this->subscribers);
+    expect($error->getMessage())->stringContainsString('You have sent more emails this month than your MailPoet plan includes,');
+    expect($error->getMessage())->stringContainsString('wait until sending is automatically resumed on 2023-01-31');
+  }
 }