public function testListRelativeFiles() { $this->assertNull(FileHelper::listRelativeFiles('ashdjghajsdgj', 'sadasd')); $this->assertEquals(['dir_1_2/dir_1_2_1/file5.txt', 'dir_1_2/file6.txt', 'dir_1_2/file7.txt'], FileHelper::listRelativeFiles($this->datapath . '/dir_1/dir_1_2', $this->datapath . '/dir_1')); }