WP PhpUnit test config and bootstrap

bootstrap.php

<?php
/**
 * Bootstraps the WordPress Integration Tests
 *
 * File should be placed in tests/phpunit/integration.
 *
 * @since       1.5.0
 * @license     GNU-2.0+
 */

if ( ! file_exists( '../../../wp-content' ) ) {
	trigger_error( 'Unable to run the integration tests, as the wp-content folder does not exist.', E_USER_ERROR );  // @codingStandardsIgnoreLine.
}

// Define testing constants.
define( 'THEME_TESTS_DIR', __DIR__ );
define( 'THEME_DIR', dirname( dirname( dirname( __DIR__ ) ) ) . DIRECTORY_SEPARATOR );
define( 'WP_CONTENT_DIR', dirname( dirname( dirname( getcwd() ) ) ) . '/wp-content/' );

if ( ! defined( 'WP_PLUGIN_DIR' ) ) {
	define( 'WP_PLUGIN_DIR', WP_CONTENT_DIR . 'plugins/' ); // @codingStandardsIgnoreLine.
}

// Composer autoloader must be loaded before WP_PHPUNIT__DIR will be available
require_once THEME_DIR . 'vendor/autoload.php';

// Give access to tests_add_filter() function.
require_once getenv( 'WP_PHPUNIT__DIR' ) . '/includes/functions.php';

/**
 * test set up, plugin activation, etc.
 */
tests_add_filter( 'setup_theme', function () {
	register_theme_directory( WP_CONTENT_DIR . 'themes' );
	switch_theme( basename( THEME_DIR ) );
} );

// Start up the WP testing environment.
require getenv( 'WP_PHPUNIT__DIR' ) . '/includes/bootstrap.php';

composer.json

"test-integration": "\"vendor/bin/phpunit\" --testsuite integration --configuration tests/phpunit/integration/phpunit.xml.dist --color=always"

phpunit.xml.dist

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		 xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
		 bootstrap="bootstrap.php"
		 backupGlobals="false"
		 colors="true"
		 beStrictAboutCoversAnnotation="true"
		 beStrictAboutOutputDuringTests="true"
		 beStrictAboutTestsThatDoNotTestAnything="true"
		 beStrictAboutTodoAnnotatedTests="true"
		 convertErrorsToExceptions="true"
		 convertNoticesToExceptions="true"
		 convertWarningsToExceptions="true"
		 verbose="true">

	<php>
		<env name="WP_PHPUNIT__TESTS_CONFIG" value="tests/config.php" />
	</php>

	<testsuites>
		<testsuite name="integration">
			<directory suffix=".php">.</directory>
		</testsuite>
	</testsuites>
</phpunit>

wp-tests-config.php

<?php
/*
 * Place in tests/ directory.
 */

/* Path to the WordPress codebase you'd like to test. Add a forward slash in the end. */
define( 'ABSPATH', dirname( dirname( dirname( dirname( __DIR__ ) ) ) ) . DIRECTORY_SEPARATOR );

/*
 * Path to the theme to test with.
 *
 * The 'default' theme is symlinked from test/phpunit/data/themedir1/default into
 * the themes directory of the WordPress installation defined above.
 */
define( 'WP_DEFAULT_THEME', 'default' );

// Test with multisite enabled.
// Alternatively, use the tests/phpunit/multisite.xml configuration file.
// define( 'WP_TESTS_MULTISITE', true );
// Force known bugs to be run.
// Tests with an associated Trac ticket that is still open are normally skipped.
// define( 'WP_TESTS_FORCE_KNOWN_BUGS', true );
// Test with WordPress debug mode (default).
define( 'WP_DEBUG', true );

// ** MySQL settings ** //
// This configuration file will be used by the copy of WordPress being tested.
// wordpress/wp-config.php will be ignored.
// WARNING WARNING WARNING!
// These tests will DROP ALL TABLES in the database with the prefix named below.
// DO NOT use a production database or one that is shared with something else.
define( 'DB_NAME', getenv( 'WP_DB_NAME' ) ?: 'tests' );
define( 'DB_USER', getenv( 'WP_DB_USER' ) ?: 'root' );
define( 'DB_PASSWORD', getenv( 'WP_DB_PASS' ) ?: '' );
define( 'DB_HOST', 'localhost' );
define( 'DB_CHARSET', 'utf8' );
define( 'DB_COLLATE', '' );

/**#@+
 * Authentication Unique Keys and Salts.
 *
 * Change these to different unique phrases!
 * You can generate these using the
 * {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
 */
define( 'AUTH_KEY', 'put your unique phrase here' );
define( 'SECURE_AUTH_KEY', 'put your unique phrase here' );
define( 'LOGGED_IN_KEY', 'put your unique phrase here' );
define( 'NONCE_KEY', 'put your unique phrase here' );
define( 'AUTH_SALT', 'put your unique phrase here' );
define( 'SECURE_AUTH_SALT', 'put your unique phrase here' );
define( 'LOGGED_IN_SALT', 'put your unique phrase here' );
define( 'NONCE_SALT', 'put your unique phrase here' );

$table_prefix = 'wpphpunittests_';   // Only numbers, letters, and underscores please!
define( 'WP_TESTS_DOMAIN', 'example.org' );
define( 'WP_TESTS_EMAIL', '[email protected]' );
define( 'WP_TESTS_TITLE', 'Test Blog' );
define( 'WP_PHP_BINARY', 'php' );
define( 'WPLANG', '' );