[android-developers] Solved: Static variables cleared in JUnit tests! (???)

It is indeed because of the call to 'super.tearDown()'.

The 'tearDown' implementation of the ActivityTestCase class calls a
protected method called 'scrubClass(...)'.
This class sets every declared field of the test-case to null (as long
as it is not primitive).

You need to override 'scrubClass(...)' to remove this 'scrubbing' from
your test-case.

I really don't understand why this 'scrubClass(...)' method was
implemented and called. The comments for this method say that it is
there to prevent memory leaks for when a test 'gave' a non static
inner class 'to someone else'. The cure of implementing this method
seems worse than the problem it tries to solve.

On Jul 30, 6:02 pm, Streets Of Boston <flyingdutc...@gmail.com> wrote:
> Hello,
>
> I have this test-code:
> =========================
> package somepackage;
>
> import android.test.ActivityInstrumentationTestCase2;
> import android.util.Log;
>
> import com.kronos.mobile.android.Constants;
> import com.kronos.mobile.android.ExceptionsSummaryActivity;
> import com.kronos.mobile.android.test.utils.KronosSolo;
>
> public class ExceptionsSummaryActivityTest extends
> ActivityInstrumentationTestCase2<ExceptionsSummaryActivity> {
>         private static String USER = "tturner";
>
>         public ExceptionsSummaryActivityTest() {
>                 super("somepackage", ExceptionsSummaryActivity.class);
>         }
>
>         @Override
>         protected void setUp() throws Exception {
>                 super.setUp();
>
>                 Log.v(Constants.LOGTAG, "Setup for "+getName()+" "+USER);
>         }
>
>         @Override
>         protected void tearDown() throws Exception {
>                 super.tearDown();
>         }
>
>         public void test010ResetData() throws Exception {
>                 Log.v(Constants.LOGTAG, "Testcase for "+getName()+" "+USER);
>         }
>
>         public void test020LoadDataFromHome() throws Exception {
>                 Log.v(Constants.LOGTAG, "Testcase for "+getName()+" "+USER);
>         }
>
>         public void test030UIElements() {
>                 Log.v(Constants.LOGTAG, "Testcase for "+getName()+" "+USER);
>         }}
>
> ===================
> The JUnit is a separate Unit Test application (apk), running another
> APK (the one under test).
>
> When I run the above test-code (all the code is shown, nothing has
> been left out), the value of USER changes magically from "tturner" to
> 'null'. In test010ResetData and the setup of this test, the value of
> USER is "tturner". In the other test-method (and their setup() calls),
> the value of USER is null.
> Ouput:
>   Setup for test010ResetData tturner
>   Testcase for test010ResetData tturner
>   Setup for test020LoadDataFromHome null
>   Testcase for test020LoadDataFromHome null
>   Setup for test030UIElements null
>   Testcase for test030UIElements null
>
> When i change this line to (adding 'final)'
>      private static final String USER = "tturner";
> the value of USER remains "tturner" for all test-methods!
> Output:
>   Setup for test010ResetData tturner
>   Testcase for test010ResetData tturner
>   Setup for test020LoadDataFromHome tturner
>   Testcase for test020LoadDataFromHome tturner
>   Setup for test030UIElements tturner
>   Testcase for test030UIElements tturner
>
> When i then change that line to (changing String to Object, still
> using 'final'):
>      private static final String USER = "tturner";
> the value of USER is again 'null' in test020 and test030!!
> Ouput:
>   Setup for test010ResetData tturner
>   Testcase for test010ResetData tturner
>   Setup for test020LoadDataFromHome null
>   Testcase for test020LoadDataFromHome null
>   Setup for test030UIElements null
>   Testcase for test030UIElements null
>
> My question is:
> Why and how are static variables (e.g. USER) of JUnit test-cases set
> to null?
> Is this correct behavior.
>
> I tried in on a G1 running 1.6 and on a Nexus1 running 2.2. They both
> have the same behavior.

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