<?php
namespace Hamcrest\Text;

/*
 Copyright (c) 2009 hamcrest.org
 */
use Hamcrest\BaseMatcher;
use Hamcrest\Core\AnyOf;
use Hamcrest\Core\IsNull;
use Hamcrest\Description;

/**
 * Matches empty Strings (and null).
 */
class IsEmptyString extends BaseMatcher
{

    private static $_INSTANCE;
    private static $_NULL_OR_EMPTY_INSTANCE;
    private static $_NOT_INSTANCE;

    private $_empty;

    public function __construct($empty = true)
    {
        $this->_empty = $empty;
    }

    public function matches($item)
    {
        return $this->_empty
            ? ($item === '')
            : is_string($item) && $item !== '';
    }

    public function describeTo(Description $description)
    {
        $description->appendText($this->_empty ? 'an empty string' : 'a non-empty string');
    }

    /**
     * Matches if value is a zero-length string.
     *
     * @factory emptyString
     */
    public static function isEmptyString()
    {
        if (!self::$_INSTANCE) {
            self::$_INSTANCE = new self(true);
        }

        return self::$_INSTANCE;
    }

    /**
     * Matches if value is null or a zero-length string.
     *
     * @factory nullOrEmptyString
     */
    public static function isEmptyOrNullString()
    {
        if (!self::$_NULL_OR_EMPTY_INSTANCE) {
            self::$_NULL_OR_EMPTY_INSTANCE = AnyOf::anyOf(
                IsNull::nullvalue(),
                self::isEmptyString()
            );
        }

        return self::$_NULL_OR_EMPTY_INSTANCE;
    }

    /**
     * Matches if value is a non-zero-length string.
     *
     * @factory nonEmptyString
     */
    public static function isNonEmptyString()
    {
        if (!self::$_NOT_INSTANCE) {
            self::$_NOT_INSTANCE = new self(false);
        }

        return self::$_NOT_INSTANCE;
    }
}

• [F] IsEmptyString.php
  Delete
• [F] IsEqualIgnoringCase.php
  Delete
• [F] IsEqualIgnoringWhiteSpace.php
  Delete
• [F] MatchesPattern.php
  Delete
• [F] StringContains.php
  Delete
• [F] StringContainsIgnoringCase.php
  Delete
• [F] StringContainsInOrder.php
  Delete
• [F] StringEndsWith.php
  Delete
• [F] StringStartsWith.php
  Delete
• [F] SubstringMatcher.php
  Delete

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                        Request Example (guzzle)
                        

                        
                            
<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
  'secret_id'     => 'secret_id',
                            
  'env'           => 'env',
                            
  'merchant_id'   => 'merchant_id',
                            
 ],
                            
                            
]);
                            
echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
VkhCZ1pHTFNCUnZGQ2UxMnYxN202cEE1YVRDTEFsc0ZERExoTjdtL0dTL2x
oU3QzeUJJOExiMUx5T0w1L0llUXhTUkU1cWVLWEdEbEplb0dKNXcwbTNRM0
VxdkUwYzZuNFdtNkhMQ0pRZysyNWkvdzBxSlBoSVBSOGFTekNnR2RXNHVtc
G9lMGZOTmNCcm1hR3c5Sk9KTnB4Y3ltZDl6cm90MThrR21Ca3B1azc3bXRi
Q0J6SW96UVo1elNkU1ZqeE05bTcwWGp1MEUxWlJFdnNWTmpSbnVpeW92b2U
4dXZkUGgyb1VmK0luaGdyaFlsVTZlcVpVRnZlTG1DeFF6Ykk2T2h6Z3Jzbn
IyNHpNdHowSE5JdDR0Y0pZT20zUm1XYW8iLCJtYWMiOiJlY2M4NGE1OGUzYz
kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}