JsonFileDataProviderIterator class for use with PHPUnit @dataProvider annotation.

README.md

JsonFileDataProviderIterator

First in the test use @dataProvider annotation and instantiate JsonFileDataProviderIterator in the data provider method, passing in the test file (__FILE__) and some namespace (something):

<?php

use \JsonFileDataProviderIterator;

class MyTest extends PHPUnit_Framework_TestCase
{
    /**
     * @dataProvider someDataProvider
     */
    public function testSomething($data)
    {
        // ...
    }

    public function someDataProvider()
    {
        return new JsonFileDataProviderIterator(__FILE__, 'something');
    }
}

Then setup a directory next to the test file with the same name replacing .php with .data, organize json data files into subdirectories matching the namespace used in the test (something).

+ MyTest.php
+ MyTest.data/
|--+ something/
|  |--+ some_simple_scenario.json
|  |--+ some_crazy_scenario.json

JsonFileDataProviderIterator.php

<?php

class JsonDataProviderIterator implements Iterator
{
    protected $position = 0;
    protected $array;

    public function __construct($test, $namespace)
    {
        $path = preg_replace('/.php$/', '.data', $test) . '/' . $namespace;

        $files = array_filter(scandir($path), function ($file) {
            return preg_match('/.json$/', $file);
        });

        $files = array_map(function ($file) use ($path) {
            return $path . '/' . $file;
        }, $files);

        sort($files);

        $this->array = $files;
    }

    public function current()
    {
        $file = $this->array[$this->position];
        $content = file_get_contents($file);
        return [json_decode($content, true)];
    }

    public function key()
    {
        return $this->position;
    }

    public function next()
    {
        ++$this->position;
    }

    public function rewind()
    {
        $this->position = 0;
    }

    public function valid()
    {
        return isset($this->array[$this->position]);
    }
}

Check this out: https://github.com/redaxmedia/phpunit-provider-autoloader