Android Unit Test : how to clear SharedPreferences

Issue

I am trying to clear all SharedPreferences added during my tests. I already read some posts and the official documentation (SharedPreferences.Editor.clear()). But when I start my application after the unit tests were run, I still found test values.

So, in the AndroidTestCase.tearDown(), I make this :

public class PrivateStorageUtilsTest extends AndroidTestCase {

private static final String KEY_SP_PACKAGE = "PrivateStorageUtilsTest";

    protected void setUp() throws Exception {
        super.setUp();

        // Clear everything in the SharedPreferences
        SharedPreferences sharedPreferences = getContext()
            .getSharedPreferences(KEY_SP_PACKAGE, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.clear();
        editor.commit();
    }

    protected void tearDown() throws Exception {
        // Clear everything in the SharedPreferences
        SharedPreferences sharedPreferences = getContext().
            getSharedPreferences(KEY_SP_PACKAGE, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.clear();
        editor.commit();
    }

}

Every other questions I found on SO was about adding commit() after the clear(), which I already done here.

EDIT 1 Adding setUp() method

EDIT 2 Providing extended class

Solution

You should extend ActivityInstrumentationTestCase2 and use getInstrumentation().getTargetContext() to get the context for the target application being instrumented (under test)

Answered By - Blackbelt