@BeforeAll
    public static void init() {
        file07 = TestFileUtil.createNewFile("simple07.xlsx");
        file03 = TestFileUtil.createNewFile("simple03.xls");
        fileCsv = TestFileUtil.createNewFile("simpleCsv.csv");
    }
Test simple read/write for Excel formats:
<li>Excel 2007 format (.xlsx)</li>
<li>Excel 2003 format (.xls)</li>
<li>CSV format (.csv)</li>
Test methods are grouped by prefixes:
<li>t0x: Basic read/write tests</li>
<li>t1x: Synchronous reading tests</li>
<li>t2x: Specific feature tests (sheet name reading, pagination, etc.)</li>

@author Jiaju Zhuang
fastexcel-test/src/test/java/cn/idev/excel/test/core/simple/SimpleDataTest.java