*/ public function dataProviderForTestGetColumnLettersFromColumnIndex() { return [ [0, 'A'], [1, 'B'], [25, 'Z'], [26, 'AA'], [28, 'AC'], ]; } /** * @dataProvider dataProviderForTestGetColumnLettersFromColumnIndex * * @param int $columnIndex * @param string $expectedColumnLetters * * @return void */ public function testGetColumnLettersFromColumnIndex($columnIndex, $expectedColumnLetters) { $this->assertEquals($expectedColumnLetters, CellHelper::getColumnLettersFromColumnIndex($columnIndex)); } }