php - Class not found in path -

so have php project , when i'm running tests class testcase isn't found , can't figure out why. error in question this: fatal error: class 'project\tests\api\testcase' not found in /some/path/here/test/project/tests/api/userstest.php on line 6

the below file named userstest.php , testcase class can't found.

<?php  namespace project\tests\api;  class userstest extends testcase {      // code here } 

the below file testcase.php exists in same folder userstest.php

<?php  namespace project\tests\api;  abstract class testcase extends \phpunit_framework_testcase {     abstract protected function getapiclass();      protected function getapimock()     {          // code here     } } 

both of these files exists in folder structure test/project/tests/api/. understanding userstest.php should able find class because both of these files exist in same namespace.

in test/project have bootstrap.php file looks this.

<?php  function includeifexists($file) {     if (file_exists($file)) {         return include $file;     } }  if ((!$loader = includeifexists(__dir__.'/../vendor/autoload.php')) && (!$loader = includeifexists(__dir__.'/../../../.composer/autoload.php'))) {     die('you must set project dependencies, run following commands:'.php_eol.         'curl -s http://getcomposer.org/installer | php'.php_eol.         'php composer.phar install'.php_eol); }  $loader->add('project\tests', __dir__);  return $loader;