PHP: Composer auto-load not working - php

Question

Actually Iam new to PHP. I am running this from a nearly empty folder (actually following along a Lara-casts tutorial: Design a Fluent API with TDD).
My directory structure looks like
src
Expression.php
tests
ExpressionTest.php
vendor
composer.json
composer.lock
Inside composer.json:
{
"require-dev": {
"phpunit/phpunit": "^5.2"
},
"autoload": {
"psr-4": {
"": "src/"
}
}
}
Inside ExpressionTest.php:
class ExpressionTest extends PHPUnit_Framework_TestCase
{
/** #test */
public function it_finds_a_string()
{
$regex = Expression::make()->find('www');
$this->assertRegExp($regex, 'www');
}
}
Inside Expression.php
<?php
class Expression
{
}
I then run composer dump-autoload and run phpunit but I still get:
"Fatal error: Class 'Expression' not found in
C:\Users\nobis\code\testing2\tests\ExpressionTest.php on line 8"
Is there something wrong with my syntax? My understanding of Composer is very basic. Thanks in advance.

Answer 1

PHPUnit does not know about Composer natively, therefore without configuring PHPUnit, it will not know about your autoloader setup.
try running PHPunit with --bootstrap vendor/autoload.php to tell it to load with your autoload file.
If that does not work, check your namespace value in your Composer configuration (i.e. "": "src/" might need to change.)

Answer 2

You need to include the autoloader at the top of your test. It is typically at
require __DIR__ . '/vendor/autoload.php';
You can also add a phpunit.xml file to your tell it where the autoloader is then it will run it before every test:
<phpunit
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/5.2/phpunit.xsd"
bootstrap="/path/to/bootstrap.php"
</phpunit>