Undefined index error in user_permission_features_export_render()

Problem

I've a module created via Features that export, a text format, a user role and the permission for user with this role to use this format. I've also a SimpleTest test case to validate other behavior of the module. When running this simple test case using Drush test-run command, I get an Undefined index error message for each test method in my test case class:
Test user_permission_features_export_render() failed: Undefined index: use text format machine_name

The (edited) stack trace of the error is

#1  call_user_func_array(user_permission_features_export_render, Array ([2] => MODULE,[3] => Array ([0] => use text format machine_name),[4] => ,[5] => user_permission)) called at [.../sites/all/modules/contrib/features/features.module:435]
#2  features_invoke(user_permission, features_export_render, MODULE, Array ([0] => use text format machine_name)) called at [.../sites/all/modules/contrib/features/features.export.inc:585]
#3  features_get_normal(user_permission, MODULE, 1) called at [.../sites/all/modules/contrib/features/features.export.inc:517]
#4  features_get_signature(normal, MODULE, user_permission, 1) called at [.../sites/all/modules/contrib/features/features.export.inc:729]
#5  features_get_component_states(Array (), 1, 1) called at [.../sites/all/modules/contrib/features/features.module:775]
#6  _features_restore(rebuild, Array ()) called at [.../sites/all/modules/contrib/features/features.module:813]
#7  features_rebuild() called at [.../sites/all/modules/contrib/features/features.module:216]
#8  features_flush_caches()
#9  call_user_func_array(features_flush_caches, Array ()) called at [.../includes/module.inc:819]
#10 module_invoke_all(flush_caches) called at [.../includes/common.inc:7149]
#11 drupal_flush_all_caches() called at [.../modules/simpletest/drupal_web_test_case.php:1417]
#12 DrupalWebTestCase->resetAll() called at [.../modules/simpletest/drupal_web_test_case.php:1336]
#13 DrupalWebTestCase->setUp(Array ([0] => MODULE)) called at [.../sites/all/modules/custom/MODULE/test/MODULE.test:8]
#14 PweTestCase->setUp() called at [.../modules/simpletest/drupal_web_test_case.php:476]
#15 DrupalTestCase->run() called at [/opt/drush/commands/core/test.drush.inc:129]
#16 simpletest_drush_run_test(MODULETestCase) called at [/opt/drush/commands/core/test.drush.inc:91]
#17 drush_test_run(MODULETestCase)
#18 call_user_func_array(drush_test_run, Array ([0] => MODULETestCase)) called at [/opt/drush/includes/command.inc:134]
#19 _drush_invoke_args(test-run, Array ([0] => MODULETestCase), test) called at [/opt/drush/includes/command.inc:806]
#20 drush_command(MODULETestCase)
#21 call_user_func_array(drush_command, Array ([0] => MODULETestCase)) called at [/opt/drush/includes/command.inc:214]
#22 drush_dispatch([...]) called at [/opt/drush/drush.php:101]
#23 drush_main() called at [/opt/drush/drush.php:41]