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MockServiceDependenciesTrait.php
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MockServiceDependenciesTrait.php
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<?php
namespace MediaWiki\Tests\Unit;
use ReflectionClass;
use ReflectionParameter;
/**
* Helper trait for instantiating MW service object for testing
* with mocked dependencies.
*/
trait MockServiceDependenciesTrait {
/**
* Construct a new instance of $serviceClass with all constructor arguments
* mocked. $parameterOverrides allows to provide some constructor argument.
*
* @param string $serviceClass
* @param array $parameterOverrides [ argument name => argument value ]
* @return mixed
*/
protected function newServiceInstance(
string $serviceClass,
array $parameterOverrides
) {
$params = [];
$reflectionClass = new ReflectionClass( $serviceClass );
$constructor = $reflectionClass->getConstructor();
foreach ( $constructor->getParameters() as $parameter ) {
$params[] = array_key_exists( $parameter->getName(), $parameterOverrides )
? $parameterOverrides[$parameter->getName()]
: $this->getMockValueForParam( $parameter );
}
return new $serviceClass( ...$params );
}
/**
* Override if this doesn't produce suitable values for one or more of the parameters to your
* factory constructor or create method.
*
* @param ReflectionParameter $param One of the factory constructor's arguments
* @return mixed A value to pass that will allow the object to be constructed successfully
*/
private function getMockValueForParam( ReflectionParameter $param ) {
$pos = $param->getPosition();
$type = $param->getType();
if ( !$type || $type->getName() === 'string' ) {
// Optimistically assume a string is okay
return "some unlikely string $pos";
}
$type = $type->getName();
if ( $type === 'array' || $type === 'iterable' ) {
return [ "some unlikely string $pos" ];
}
if ( class_exists( $type ) || interface_exists( $type ) ) {
return $this->createMock( $type );
}
$this->fail( "Unrecognized parameter type $type" );
}
}

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