我们写培训单元测试，写case代码的时候，可能会遇到一条case依赖另外一条case，比如我现在用一个xml文件生成html文件，但是这个xml文件是另外一条case生成的。所以我们需要定义一种依赖是生成html的case要在生成xml文件的case之后生成，看看有什么解决的方法
　　dependsOnGroups
　　生成xml的单测case如下：
　　@Test(groups = { "unittest"，"androidtestresult" })
　　public void generateAndroidXmlTestResult()
　　生成html的单测case如下：
　　@Test(groups = { "unittest" }， dependsOnGroups = { "androidtestresult" })
　　public void generatorAndroidReportByMuiltDirTest()
　　在需要依赖的case上定义了dependsOnGroups属性，里面是被依赖case所在的组，这样当该case执行的时候，被依赖组中的case都会被执行。而我只是给groups定义为androidtestresult，所以androidtestresult组中只有一条case为generateAndroidXmlTestResult，所以只会执行这条case。
　　执行结果：
[TestNG] Running:
/private/var/folders/3j/s3hfvmy572vcn3h02c_rxcbm0000gn/T/testng-eclipse-774643464/testng-customsuite.xml
2015-07-31 12:21:10 INFO  TestResult:156 - Created testResult.xml  file at file:///Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/MI_2G_dksldfdffdf_4.4.2_201507210823923/testResult.xml
2015-07-31 12:21:10 INFO  TestResult:93 - TestResult [rootDir=/Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/MI_2G_dksldfdffdf_4.4.2_201507210823923， loops={case3=com.wuba.result.TestCaseLoop@3c6210fb， case1=com.wuba.result.TestCaseLoop@4a48edb5， case2=com.wuba.result.TestCaseLoop@79ee2c2c}， device=MI， network=2G， sn=dksldfdffdf， version=4.4.2]
2015-07-31 12:21:10 INFO  XmlReportGenerator:108 - Read testResult.xml finished
2015-07-31 12:21:10 INFO  XmlReportGenerator:109 - TestResult [rootDir=/Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/MI_2G_dksldfdffdf_4.4.2_201507210823923， loops={case3=com.wuba.result.TestCaseLoop@661736e， case1=com.wuba.result.TestCaseLoop@67e13e07， case2=com.wuba.result.TestCaseLoop@74af72d8}， device=MI， network=2G， sn=dksldfdffdf， version=4.4.2]
2015-07-31 12:21:10 INFO  XmlReportGenerator:108 - Read testResult.xml finished
2015-07-31 12:21:10 INFO  XmlReportGenerator:109 - TestResult [rootDir=/Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/MI_3G_dksldfdffdf_4.4.2_20150721082392， loops={case4=com.wuba.result.TestCaseLoop@4b1c2b67， case5=com.wuba.result.TestCaseLoop@26659db7， case6=com.wuba.result.TestCaseLoop@59556d12}， device=MI， network=3G， sn=dksldfdffdf， version=4.4.2]
2015-07-31 12:21:10 INFO  XmlReportGenerator:108 - Read testResult.xml finished
2015-07-31 12:21:10 INFO  XmlReportGenerator:109 - TestResult [rootDir=/Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/MI_4G_dksldfdffdf_4.4.2_20150721082392， loops={case7=com.wuba.result.TestCaseLoop@1a0fced4， case8=com.wuba.result.TestCaseLoop@3d3cdaa， case9=com.wuba.result.TestCaseLoop@466355dc}， device=HW， network=4G， sn=1232324343， version=4.4.2]
2015-07-31 12:21:10 INFO  XmlReportGenerator:108 - Read testResult.xml finished
2015-07-31 12:21:10 INFO  XmlReportGenerator:109 - TestResult [rootDir=/Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/result/android/HW_4G_12323242_4.4.2_20150721082392， loops={case7=com.wuba.result.TestCaseLoop@5421e554， case8=com.wuba.result.TestCaseLoop@7d5718f2， case9=com.wuba.result.TestCaseLoop@6126f827}， device=MI， network=4G， sn=dksldfdffdf， version=4.4.2]
2015-07-31 12:21:10 INFO  TestReport:78 - Created file at file:///Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/report/2015-07-31_12-21-10/testReport.xml
2015-07-31 12:21:10 INFO  HtmlReportGenerator:95 - Created report html file at file:///Users/wuxian/Documents/sourcecode/self/ResponseTimeTool/repo/report/2015-07-31_12-21-10/testReport.html
PASSED: generateAndroidXmlTestResult
PASSED: generatorAndroidReportByMuiltDirTest
===============================================
Default test
Tests run: 2， Failures: 0， Skips: 0
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Default suite
Total tests run: 2， Failures: 0， Skips: 0
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[TestNG] Time taken by org.testng.reporters.jq.Main@fcfa52: 31 ms
[TestNG] Time taken by org.testng.reporters.XMLReporter@388ee016: 7 ms
[TestNG] Time taken by org.testng.reporters.EmailableReporter2@351563ff: 3 ms
[TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 0 ms
[TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@220ca470: 9 ms
[TestNG] Time taken by org.testng.reporters.JUnitReportReporter@47d62270: 5 ms