MockHelper.php

<?php

declare(strict_types=1);

namespace Deezer\Legacy\Test\ActivationJourney;

use Prophecy\Prophet;

class MockHelper
{
    /** @var Prophet */
    private $prophet;

    /** @var array  */
    private $mockDefaultParams;

    public function __construct()
    {
        $this->prophet = new Prophet();
        $this->mockDefaultParams = [];
    }

    public function setDefaultParamsForMock(string $classname, array $defaultParams)
    {
        $this->mockDefaultParams[$classname] = $defaultParams;
    }

    public function getMock(string $classname, array $customParams = [])
    {
        $mockParams = array_merge($this->mockDefaultParams[$classname], $customParams);

        $mock = $this->prophet->prophesize($classname);

        $reflectionClass = new \ReflectionClass($classname);
        foreach ($reflectionClass->getMethods() as $method) {
            $methodName = $method->getName();
            switch (true) {
                case preg_match('/^_/', $methodName):
                    // magic method
                    continue(2);
                case preg_match('/^(get|is)/', $methodName):
                    //mock getters
                    $propertyName = $this->getPropertyNameForAMethod($methodName);
                    $returnValue = $mockParams[$propertyName] ?? null;
                    $this->handleGetter($mock, $methodName, $returnValue);
                    break;
            }
        }

        return $mock->reveal();
    }

    private function handleGetter($mock, string $methodName, $returnValue): void
    {
        $mock
            ->$methodName()
            ->willReturn($returnValue);
    }

    private function getPropertyNameForAMethod(string $methodName): string
    {
        return implode('_', array_slice(explode('_', $this->camelCaseToSnakeCase($methodName)), 1));
    }

    private function camelCaseToSnakeCase(string $value): string
    {
        return strtolower(preg_replace('/(.)(?=[A-Z])/', "$1" . '_', $value));
    }
}