public function testRemoveColumn()
{
$this->configuration->addColumn('testColumn', ['param' => 123], null, ['param' => 123], ['param' => 123]);
$configArray = $this->configuration->toArray();
$this->assertTrue(isset($configArray['columns']['testColumn']));
$this->configuration->removeColumn('testColumn');
$configArray = $this->configuration->toArray();
$this->assertEmpty($configArray['columns']);
$this->assertEmpty($configArray['sorters']['columns']);
$this->assertEmpty($configArray['filters']['columns']);
}