将JAR文件添加到测试类路径：

Question

Am performing a junit test on one of my methods in a class in android. and according to the info at http://code.google.com/appengine/docs/java/tools/localunittesting.html i should add the libraries below to my classpath.

${SDK_ROOT}/lib/impl/appengine-api.jar
${SDK_ROOT}/lib/impl/appengine-api-labs.jar
${SDK_ROOT}/lib/impl/appengine-api-stubs.jar

My question is, where in us should i get this libraries and how should i add them? am using android studio running on ubuntu 15 64bit.

am fairly new in android and GAE things!

what i have tried this is what i have added to my modlue's build.gradle

dependencies {
testCompile 'junit:junit:4.12'
testCompile "org.mockito:mockito-core:1.9.5"
testCompile 'com.google.appengine:appengine-testing:1.8.2'
testCompile 'com.google.appengine:appengine-api-labs:1.8.2'
testCompile 'com.google.appengine:appengine-api-stubs:1.8.2'
testCompile 'com.google.appengine:appengine-tools-sdk:1.8.2'
testCompile 'org.json:json:20141113'
}

When i try to run my junit test class. this is what am getting

com.googlecode.objectify.SaveException: Error saving 
com.top.ash.backend.entities.Ameggedon@589b3632: No API environment is registered for this thread.

com.googlecode.objectify.impl.EntityMetadata.save(EntityMetadata.java:95)
 at com.googlecode.objectify.impl.WriteEngine.save(WriteEngine.java:75)
  at com.googlecode.objectify.impl.SaverImpl.entities(SaverImpl.java:60)
  at com.googlecode.objectify.impl.SaverImpl.entity(SaverImpl.java:35)

org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.NullPointerException: No API environment is registered for this thread.

Answer 1

Note: I know nothing about GAE, but here is how you can add jars from folder to test classpath.

Create a new folder in the same directory as libs folder (in this picture it is called testlibs ). In this directory you should put those jars.

Now, add to the build.gradle of the module (not of the project), inside dependencies block:

dependencies {
    ...
    testCompile fileTree(dir: 'testlibs', include: ['*.jar'])
}

Now in your tests (Junit, not instrumentation) you could use the methods from the jar.