PHPCS: whitelist some code for select sniffs

Includes minor documentation fix.

Author: jrfnl

features/bootstrap/support.php

@@ -16,12 +16,14 @@ function assert_regex( $regex, $actual ) {
 }
 
 function assert_equals( $expected, $actual ) {
+	// phpcs:ignore WordPress.PHP.StrictComparisons.LooseComparison -- Deliberate loose comparison.
 	if ( $expected != $actual ) {
 		throw new Exception( 'Actual value: ' . var_export( $actual, true ) );
 	}
 }
 
 function assert_not_equals( $expected, $actual ) {
+	// phpcs:ignore WordPress.PHP.StrictComparisons.LooseComparison -- Deliberate loose comparison.
 	if ( $expected == $actual ) {
 		throw new Exception( 'Actual value: ' . var_export( $actual, true ) );
 	}

features/extra/no-mail.php

@@ -1,12 +1,18 @@
 <?php
-
-/*
+/**
  * This file is copied as amu-plugin into new WP installs to reroute normal
  * mails into log entries.
  */
 
+/**
+ * Replace WP native pluggable wp_mail function for test purposes.
+ *
+ * @param string $to Email address.
+ *
+ * @phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedFunctionFound -- WP native function.
+ */
 function wp_mail( $to ) {
 	// Log for testing purposes
 	WP_CLI::log( "WP-CLI test suite: Sent email to {$to}." );
 }
-
+// phpcs:enable

tests/bootstrap.php

@@ -1,13 +1,17 @@
 <?php
 define( 'WP_CLI', true );
 define( 'WP_CLI_TESTS_ROOT', dirname( __DIR__ ) );
+
+// These constants are actively used by dependent projects, renaming them would be a BC-break.
+// phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedConstantFound
 define(
 	'VENDOR_DIR',
 	file_exists( WP_CLI_TESTS_ROOT . '/vendor/autoload.php' )
 		? WP_CLI_TESTS_ROOT . '/vendor'
 		: WP_CLI_TESTS_ROOT . '/../..'
 );
 define( 'PACKAGE_ROOT', VENDOR_DIR . '/..' );
+// phpcs:enable
 
 define(
 	'WP_CLI_ROOT',