Library used: com.android.support.test:{rules:0.4,espresso-intents-2.2.1}
Devices/Android versions reproduced on: any

I use the IntentsTestRule in my JUnit test to start my activity and capture intents that it issues. If the activity fails to launch for any reason, "Intents.release()" is called. In this method, "defaultInstance.internalRelease()" is called uncondtionally, i.e. also when "defaultInstance" is still null, which leads to an NPE.

Full stack trace:

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.test.espresso.intent.Intents.internalRelease()' on a null object reference
at android.support.test.espresso.intent.Intents.release(Intents.java:140)
at android.support.test.espresso.intent.rule.IntentsTestRule.afterActivityFinished(IntentsTestRule.java:68)
at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:260)
at my.package.MockServerRule$1.evaluate(MockServerRule.java:29)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
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.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
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$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:54)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:240)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1976)

Source code of MockServerRule:

public class MockServerRule implements TestRule {
@Override
public Statement apply(final Statement base, Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
startServer();
try {
base.evaluate();
} finally {
stopServer();
}
}
};
}
...
}

My test class:

@RunWith(AndroidJUnit4.class)
public class LoginActivityTest {
@Rule
public final IntentsTestRule<LoginActivitySingle> mActivityTestRule = new IntentsTestRule<>(LoginActivitySingle.class, true, false);

@Rule
public final MockServerRule mMockServerRule = new MockServerRule();

@Test
public void someTest() {
Activity activity = mActivityTestRule.getActivity();
...
}
}