Robolectric and Android SDK 29

Question

When will Robolectric be compatible with Android SDK 29? Did I upgraded too early by changing targetSdkVersion and compileSdkVersion to 29?

When I run my unit tests I get this huge stacktrace:

java.lang.IllegalArgumentException: API level 29 is not available      at org.robolectric.plugins.UnknownSdk.getJarPath(UnknownSdk.java:25)     at org.robolectric.internal.AndroidSandbox$SdkSandboxClassLoader.<init>(AndroidSandbox.java:102)     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)     at org.robolectric.util.inject.Injector.inject(Injector.java:239)   at org.robolectric.util.inject.Injector.lambda$memoized$1(Injector.java:221)     at org.robolectric.util.inject.Injector$MemoizingProvider.get(Injector.java:485)     at org.robolectric.util.inject.Injector.getInstanceInternal(Injector.java:213)     at org.robolectric.util.inject.Injector.resolveDependencies(Injector.java:283)     at org.robolectric.util.inject.Injector.inject(Injector.java:237)   at org.robolectric.util.inject.Injector.lambda$memoized$1(Injector.java:221)     at org.robolectric.util.inject.Injector$MemoizingProvider.get(Injector.java:485)     at org.robolectric.util.inject.Injector.getInstanceInternal(Injector.java:213)     at org.robolectric.util.inject.Injector.getInstance(Injector.java:197)     at org.robolectric.util.inject.Injector.access$700(Injector.java:85)     at org.robolectric.util.inject.Injector$ScopeBuilderProvider.create(Injector.java:551)     at org.robolectric.util.inject.Injector$ScopeBuilderProvider.lambda$get$0(Injector.java:534)     at com.sun.proxy.$Proxy13.build(Unknown Source)     at org.robolectric.internal.SandboxManager.getAndroidSandbox(SandboxManager.java:57)     at org.robolectric.RobolectricTestRunner.getSandbox(RobolectricTestRunner.java:267)     at org.robolectric.RobolectricTestRunner.getSandbox(RobolectricTestRunner.java:63)     at org.robolectric.internal.SandboxTestRunner$2.evaluate(SandboxTestRunner.java:215)     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)    at org.robolectric.internal.SandboxTestRunner$1.evaluate(SandboxTestRunner.java:96)     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)  at org.junit.runner.JUnitCore.run(JUnitCore.java:115)  at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:40)     at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)     at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)     at java.util.Iterator.forEachRemaining(Iterator.java:116)   at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)     at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)     at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)     at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)     at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)     at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)     at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)     at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:80)     at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:71)     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)     at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)     at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)     at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:74)     at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)     at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)     at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) 

Answer 1

Create a robolectric.properties file inside the app/src/test/resources directory with the following line:

sdk=28 

This will force Robolectric to use API 28 instead of 29.