报错Log：
<pre>
FAILED CONFIGURATION: @BeforeSuite globalSetup
io.appium.java_client.service.local.InvalidServerInstanceException: Invalid server instance exception has occured: There is no installed nodes! Please install node via NPM (https://www.npmjs.com/package/appium#using-node-js) or download and install Appium app (http://appium.io/downloads.html)
at io.appium.java_client.service.local.AppiumServiceBuilder.findNodeInCurrentFileSystem(AppiumServiceBuilder.java:155)
at io.appium.java_client.service.local.AppiumServiceBuilder.checkAppiumJS(AppiumServiceBuilder.java:309)
at io.appium.java_client.service.local.AppiumServiceBuilder.createArgs(AppiumServiceBuilder.java:389)
at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:332)
at io.appium.java_client.service.local.AppiumDriverLocalService.buildService(AppiumDriverLocalService.java:76)
at io.appium.java_client.service.local.AppiumDriverLocalService.buildDefaultService(AppiumDriverLocalService.java:72)
at org.sem.sample.example_code.BaseTest.globalSetup(BaseTest.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:514)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:215)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:142)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:305)
at org.testng.SuiteRunner.run(SuiteRunner.java:268)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
at org.testng.TestNG.run(TestNG.java:1064)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)
Caused by: java.io.IOException: C:\Users\Young\AppData\Roaming\npm\node_modules
at io.appium.java_client.service.local.AppiumServiceBuilder.findNodeInCurrentFileSystem(AppiumServiceBuilder.java:156)
... 24 more
SKIPPED CONFIGURATION: @BeforeClass setUp
SKIPPED CONFIGURATION: @AfterClass tearDown
SKIPPED: testCreateSession
===============================================
Default test
Tests run: 1, Failures: 0, Skips: 1
Configuration Failures: 1, Skips: 2
===============================================
===============================================
Default suite
Total tests run: 1, Failures: 0, Skips: 1
Configuration Failures: 1, Skips: 3
===============================================
[TestNG] Time taken by org.testng.reporters.jq.Main@60f82f98: 66 ms
[TestNG] Time taken by org.testng.reporters.JUnitReportReporter@7a5d012c: 14 ms
[TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@67b64c45: 121 ms
[TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 22 ms
[TestNG] Time taken by org.testng.reporters.XMLReporter@6aaa5eb0: 10 ms
[TestNG] Time taken by org.testng.reporters.EmailableReporter2@380fb434: 7 ms
</pre>
这个问题在网上搜了搜大家基本上都是说要用命令行安装Appium，这个办法比较麻烦。
其实io.appium.java_client调用的是/usr/local/lib/node_modules这个路径下的Appium，所以我们只需要做个软链接，程序就可以跑通啦，比如：
cd /usr/local/lib/node_modules
ln -s /Applications/Appium.app/Contents/Resources/app/node_modules/appium/ appium