--- /dev/null
+<?php
+
+namespace Drupal\Core\Test;
+
+/**
+ * Provides methods for testing emails sent during test runs.
+ */
+trait AssertMailTrait {
+
+ /**
+ * Gets an array containing all emails sent during this test case.
+ *
+ * @param array $filter
+ * An array containing key/value pairs used to filter the emails that are
+ * returned.
+ *
+ * @return array
+ * An array containing email messages captured during the current test.
+ */
+ protected function getMails(array $filter = []) {
+ $captured_emails = $this->container->get('state')->get('system.test_mail_collector', []);
+ $filtered_emails = [];
+
+ foreach ($captured_emails as $message) {
+ foreach ($filter as $key => $value) {
+ if (!isset($message[$key]) || $message[$key] != $value) {
+ continue 2;
+ }
+ }
+ $filtered_emails[] = $message;
+ }
+
+ return $filtered_emails;
+ }
+
+ /**
+ * Asserts that the most recently sent email message has the given value.
+ *
+ * The field in $name must have the content described in $value.
+ *
+ * @param string $name
+ * Name of field or message property to assert. Examples: subject, body,
+ * id, ...
+ * @param string $value
+ * Value of the field to assert.
+ * @param string $message
+ * (optional) A message to display with the assertion. Do not translate
+ * messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+ * variables in the message text, not t(). If left blank, a default message
+ * will be displayed.
+ * @param string $group
+ * (optional) The group this message is in, which is displayed in a column
+ * in test output. Use 'Debug' to indicate this is debugging output. Do not
+ * translate this string. Defaults to 'Email'; most tests do not override
+ * this default.
+ *
+ * @return bool
+ * TRUE on pass, FALSE on fail.
+ */
+ protected function assertMail($name, $value = '', $message = '', $group = 'Email') {
+ $captured_emails = $this->container->get('state')->get('system.test_mail_collector') ?: [];
+ $email = end($captured_emails);
+ return $this->assertTrue($email && isset($email[$name]) && $email[$name] == $value, $message, $group);
+ }
+
+ /**
+ * Asserts that the most recently sent email message has the string in it.
+ *
+ * @param string $field_name
+ * Name of field or message property to assert: subject, body, id, ...
+ * @param string $string
+ * String to search for.
+ * @param int $email_depth
+ * Number of emails to search for string, starting with most recent.
+ * @param string $message
+ * (optional) A message to display with the assertion. Do not translate
+ * messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+ * variables in the message text, not t(). If left blank, a default message
+ * will be displayed.
+ * @param string $group
+ * (optional) The group this message is in, which is displayed in a column
+ * in test output. Use 'Debug' to indicate this is debugging output. Do not
+ * translate this string. Defaults to 'Other'; most tests do not override
+ * this default.
+ *
+ * @return bool
+ * TRUE on pass, FALSE on fail.
+ */
+ protected function assertMailString($field_name, $string, $email_depth, $message = '', $group = 'Other') {
+ $mails = $this->getMails();
+ $string_found = FALSE;
+ // Cast MarkupInterface objects to string.
+ $string = (string) $string;
+ for ($i = count($mails) - 1; $i >= count($mails) - $email_depth && $i >= 0; $i--) {
+ $mail = $mails[$i];
+ // Normalize whitespace, as we don't know what the mail system might have
+ // done. Any run of whitespace becomes a single space.
+ $normalized_mail = preg_replace('/\s+/', ' ', $mail[$field_name]);
+ $normalized_string = preg_replace('/\s+/', ' ', $string);
+ $string_found = (FALSE !== strpos($normalized_mail, $normalized_string));
+ if ($string_found) {
+ break;
+ }
+ }
+ if (!$message) {
+ $message = format_string('Expected text found in @field of email message: "@expected".', ['@field' => $field_name, '@expected' => $string]);
+ }
+ return $this->assertTrue($string_found, $message, $group);
+ }
+
+ /**
+ * Asserts that the most recently sent email message has the pattern in it.
+ *
+ * @param string $field_name
+ * Name of field or message property to assert: subject, body, id, ...
+ * @param string $regex
+ * Pattern to search for.
+ * @param string $message
+ * (optional) A message to display with the assertion. Do not translate
+ * messages: use \Drupal\Component\Utility\SafeMarkup::format() to embed
+ * variables in the message text, not t(). If left blank, a default message
+ * will be displayed.
+ * @param string $group
+ * (optional) The group this message is in, which is displayed in a column
+ * in test output. Use 'Debug' to indicate this is debugging output. Do not
+ * translate this string. Defaults to 'Other'; most tests do not override
+ * this default.
+ *
+ * @return bool
+ * TRUE on pass, FALSE on fail.
+ */
+ protected function assertMailPattern($field_name, $regex, $message = '', $group = 'Other') {
+ $mails = $this->getMails();
+ $mail = end($mails);
+ $regex_found = preg_match("/$regex/", $mail[$field_name]);
+ if (!$message) {
+ $message = format_string('Expected text found in @field of email message: "@expected".', ['@field' => $field_name, '@expected' => $regex]);
+ }
+ return $this->assertTrue($regex_found, $message, $group);
+ }
+
+ /**
+ * Outputs to verbose the most recent $count emails sent.
+ *
+ * @param int $count
+ * Optional number of emails to output.
+ */
+ protected function verboseEmail($count = 1) {
+ $mails = $this->getMails();
+ for ($i = count($mails) - 1; $i >= count($mails) - $count && $i >= 0; $i--) {
+ $mail = $mails[$i];
+ $this->verbose('Email:<pre>' . print_r($mail, TRUE) . '</pre>');
+ }
+ }
+
+}