/**
  * testDeleteBackendConfiguration
  */
 public function testDeleteBackendConfiguration()
 {
     Tinebase_Auth::setBackendType(Tinebase_Auth::LDAP);
     $key = 'host';
     Tinebase_Auth::setBackendConfiguration('configured-host', $key);
     $this->assertEquals('configured-host', Tinebase_Auth::getBackendConfiguration($key, 'default-host'));
     Tinebase_Auth::deleteBackendConfiguration($key);
     $this->assertEquals('default-host', Tinebase_Auth::getBackendConfiguration($key, 'default-host'));
     $configOptionsCount = count(Tinebase_Auth::getBackendConfiguration());
     Tinebase_Auth::deleteBackendConfiguration('non-existing-key');
     $this->assertEquals($configOptionsCount, count(Tinebase_Auth::getBackendConfiguration()));
     Tinebase_Auth::setBackendConfiguration('phpunit-dummy-value', $key);
     $this->assertTrue(count(Tinebase_Auth::getBackendConfiguration()) > 0);
     Tinebase_Auth::deleteBackendConfiguration();
     $this->assertTrue(count(Tinebase_Auth::getBackendConfiguration()) == 0);
 }