Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wp-mail-smtp/src/MailCatcherInterface.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace WPMailSMTP;
+
+/**
+ * Interface MailCatcherInterface.
+ *
+ * @since 2.2.0
+ */
+interface MailCatcherInterface {
+
+	/**
+	 * Modify the default send() behaviour.
+	 * For those mailers, that relies on PHPMailer class - call it directly.
+	 * For others - init the correct provider and process it.
+	 *
+	 * @since 2.2.0
+	 *
+	 * @throws \phpmailerException|\PHPMailer\PHPMailer\Exception When sending via PhpMailer fails for some reason.
+	 *
+	 * @return bool
+	 */
+	public function send();
+
+	/**
+	 * Get the PHPMailer line ending.
+	 *
+	 * @since 2.2.0
+	 *
+	 * @return string
+	 */
+	public function get_line_ending();
+
+	/**
+	 * Create a unique ID to use for multipart email boundaries.
+	 *
+	 * @since 2.4.0
+	 *
+	 * @return string
+	 */
+	public function generate_id();
+
+	/**
+	 * Get debug event ID.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @return bool|int
+	 */
+	public function get_debug_event_id();
+
+	/**
+	 * Whether the current email is a test email.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @return bool
+	 */
+	public function is_test_email();
+
+	/**
+	 * Whether the current email is a Setup Wizard test email.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @return bool
+	 */
+	public function is_setup_wizard_test_email();
+}