extension/mysite_hello/
    phpunit.xml.dist
    tests/
        bootstrap.php
        unit/
            OperatorsTest.php

<?xml version="1.0" encoding="UTF-8"?>
<!--
  The unit tests of mysite_hello: plain PHP, no database, no request.
  Run from extension/mysite_hello: php ../../vendor/bin/phpunit
-->
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         bootstrap="tests/bootstrap.php"
         colors="false"
         cacheDirectory="tests/.phpunit.cache"
         failOnWarning="true"
         failOnRisky="true"
         beStrictAboutOutputDuringTests="true">
    <testsuites>
        <testsuite name="unit">
            <directory suffix="Test.php">tests/unit</directory>
        </testsuite>
    </testsuites>
</phpunit>

<?php
/**
 * PHPUnit bootstrap for mysite_hello: loads only the plain classes under test. Nothing of Exponential is booted.
 */
date_default_timezone_set( 'UTC' );
require_once dirname( __DIR__ ) . '/classes/mysitehellooperators.php';

<?php
/**
 * The template operators of mysite_hello, called directly: no template engine needed.
 */
class OperatorsTest extends PHPUnit\Framework\TestCase
{
    private function runOperator( $name, $value, array $named )
    {
        $operators = new mysiteHelloOperators();
        $operators->modify( null, $name, array(), '', '', $value, $named );
        return $value;
    }

    public function testGreetUsesTheDefaultGreeting()
    {
        $this->assertSame( 'Hello, Ada!', $this->runOperator( 'mysite_greet', null, array( 'name' => 'Ada', 'greeting' => 'Hello' ) ) );
    }

    public function testInitialsOfUtf8Names()
    {
        $this->assertSame( 'ÉZ', $this->runOperator( 'mysite_initials', 'émile zola', array() ) );
    }

    public function testEveryOperatorHasAParameterList()
    {
        $operators = new mysiteHelloOperators();
        $this->assertSame( $operators->operatorList(), array_keys( $operators->namedParameterList() ) );
    }
}

cd extension/mysite_hello
php ../../vendor/bin/phpunit

find extension/mysite_hello -name '*.php' -print0 | xargs -0 -n1 php -l | grep -v '^No syntax errors'
php bin/php/checkclasses.php --quiet-ok
./console exp:checkcodestyle