Add tests for #28835

tests/php/includes/class-wc-emails-tests.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Class WC_Emails_Tests.
+ */
+class WC_Emails_Tests extends \WC_Unit_Test_Case {
+
+	/**
+	 * Test that email_header hooks are compitable with do_action calls with only param.
+	 * This test should be dropped after all extensions are using compitable do_action calls.
+	 */
+	public function test_email_header_is_compatible_with_legacy_do_action() {
+		$email_object = new WC_Emails();
+		// 10 is expected priority of the hook.
+		$this->assertEquals( 10, has_action( 'woocommerce_email_header', array( $email_object, 'email_header' ) ) );
+		ob_start();
+		do_action( 'woocommerce_email_header', 'header' );
+		$content = ob_get_contents();
+		ob_end_clean();
+		$this->assertFalse( empty( $content ) );
+	}
+
+	/**
+	 * Test that email_footer hooks are compitable with do_action calls with only param.
+	 * This test should be dropped after all extensions are using compitable do_action calls.
+	 */
+	public function test_email_footer_is_compatible_with_legacy_do_action() {
+		$email_object = new WC_Emails();
+		// 10 is expected priority of the hook.
+		$this->assertEquals( 10, has_action( 'woocommerce_email_footer', array( $email_object, 'email_footer' ) ) );
+		ob_start();
+		do_action( 'woocommerce_email_footer' );
+		$content = ob_get_contents();
+		ob_end_clean();
+		$this->assertFalse( empty( $content ) );
+	}
+}