Accessing application context from TestSuite in Setup() before calling getActivity()

Question

I have an Activity that pulls an object from an Application extended class (application context) from within the OnCreate() method.

When unit testing this activity, the object needed isn't there because it is populated from a previous Activity and stored in the above mentioned application context.

Needless to say, when I call getActivity() from within my ActivityInstrumentationTestCase2 extended test case I get a null pointer exception.

How can I populate the context before an activity is started and have it available to that Activity?

Updated: After a bit of digging I found: this.getInstrumentation().getTargetContext() and then cast it to the type of my Application extended class. But I get a class cast exception and the trace points to this:

04-04 21:02:27.036: INFO/TestRunner(431): started: testIt(edu.rockies.rockies.activity.courses.test.TopicTest) 04-04 21:02:27.126: INFO/TestRunner(431): failed: testIt(edu.rockies.rockies.activity.courses.test.TopicTest) 04-04 21:02:27.126: INFO/TestRunner(431): ----- begin exception ----- 04-04 21:02:27.136: INFO/TestRunner(431): java.lang.ClassCastException: android.app.ApplicationContext 04-04 21:02:27.136: INFO/TestRunner(431):     at edu.rockies.rockies.activity.courses.test.TopicTest.setUp(TopicTest.java:27) 04-04 21:02:27.136: INFO/TestRunner(431):     at junit.framework.TestCase.runBare(TestCase.java:125) 04-04 21:02:27.136: INFO/TestRunner(431):     at junit.framework.TestResult$1.protect(TestResult.java:106) 04-04 21:02:27.136: INFO/TestRunner(431):     at junit.framework.TestResult.runProtected(TestResult.java:124) 04-04 21:02:27.136: INFO/TestRunner(431):     at junit.framework.TestResult.run(TestResult.java:109) 04-04 21:02:27.136: INFO/TestRunner(431):     at junit.framework.TestCase.run(TestCase.java:118) 04-04 21:02:27.136: INFO/TestRunner(431):     at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169) 04-04 21:02:27.136: INFO/TestRunner(431):     at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154) 04-04 21:02:27.136: INFO/TestRunner(431):     at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:430) 04-04 21:02:27.136: INFO/TestRunner(431):     at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447) 04-04 21:02:27.136: INFO/TestRunner(431): ----- end exception ----- 04-04 21:02:27.156: INFO/TestRunner(431): finished: testIt(edu.rockies.rockies.activity.courses.test.TopicTest) 

this.getInstrumentation().getTargetContext() is supposed to return an object of type context. But I get the android.app.ApplicationContext class cast exeption which doesn't make sense.

Update 2:

I did some more research and discovered this for android.app.Application

java.lang.Object     android.content.Context         android.app.ApplicationContext             android.app.Application 

But Google's own Android Javadoc refers to this:

java.lang.Object     android.content.Context         android.content.ContextWrapper             android.app.Application 

What's going on? Something's not right.

Update 3:

I have replaced the following line of code:

this.getInstrumentation().getTargetContext(); 

with this line of code.

this.getInstrumentation().getTargetContext().getApplicationContext(); 

Although the context resolves properly, it doesn't seem to be the same context as the activity's.

Answer 1

Ok, this issue is resolved. To get access to the context before getActivity() has been called you need to call this function:

Context context = this.getInstrumentation().getTargetContext().getApplicationContext(); 

Answer 2

With the newer UI testing framework getInstrumentation() is no longer available. One way to get hold of the Application object is to cast the application Context:

Application app =          (Application) InstrumentationRegistry                 .getTargetContext()                 .getApplicationContext();