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PhpStorm: Class 'PhpUnit\Framework\TestCase' not found (composer / autoload)

I've got a problem with PhpStorm, composer and PHPUnit.

  • Windows 8.1 Pro (64 bit)
  • PhpStorm is up to date: 2018.2.2
  • Tried different PHP interpreters like XAMPP and a clean PHP for win
  • PHPUnit is required by composer with: "phpunit/phpunit": "^7.3.3".
  • PHPUnit is successfully installed via composer to the vendor directory as well.
  • PHPUnit is recognized from PhpStorm:

enter image description here

My test class extends the PhpUnit\Framework\TestCase class and when you run the test, the following happens:

enter image description here

First it seems like PhpStorm loads the old PHPUnit (3.7.21) from XAMPP's PHP and not the recognized PHPUnit (7.3.3) as setup in the PhpStorm settings / installed to the vendor folder.

But I don't think so.

I think PhpStorm tries to load the PhpUnit\Framework\TestCase class by the autoloader, but I don't know why it doesn't find the PHPUnit...

Thanks in advance!

The whole project could be minimized to this simple test class:

enter image description here

The composer.json looks like the following:

"autoload": {
  "psr-4": {
    "Flo\\Newsletter\\": "src/"
  }
},
"require": {
  "php": "^7.1"
},
"require-dev": {
  "phpunit/phpunit": "^7.3.3"
}
Solution

  • Namespaces are case-sensitive. Please change PhpUnit to PHPUnit in the import.

    Although PhpStorm could really detect that. Here's a feature request for that: https://youtrack.jetbrains.com/issue/WI-38140