/** * Test execute first column. */ public function testExecuteFirstColumn() { $this->assertEquals(['Alexander Pushkin', 'Fyodor Dostoyevsky', 'Leo Tolstoy'], $this->connection->executeFirstColumn('SELECT `name` FROM `writers` ORDER BY `name`')); $this->assertEquals(['1799-06-06', '1821-11-11', '1828-09-09'], $this->connection->executeFirstColumn('SELECT `birthday` FROM `writers` ORDER BY `name`')); }