How to test shared preference

Question

When unit testing shared preference, is the value get refresh every test?

public static void putString(Context context, String key, String val) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString(key, val);
        editor.apply();
    }

you can check your shared.xml file where your shared preferences are saved. — Umair, Oct 01 '18 at 07:28
What exactly do you mean by "refresh"? Reset every instance? If so, then no. — daedsidog, Oct 01 '18 at 07:30
@Alvin open device file explorer then go to your app open it there will be a folder named shared_pref (in your case whatever name you gave). And the file would be there. — Umair, Oct 01 '18 at 07:33
Try this: https://stackoverflow.com/questions/35105545/how-to-mock-a-sharedpreferences-using-mockito — Faysal Ahmed, Oct 01 '18 at 07:36

score 1 · Answer 1 · answered Oct 01 '18 at 07:39

Once you run your function it will save the val under the key which will be saved for every other instance. If you want to be absolutely be sure of this, you can read the value using another function (and maybe a different instance) usingPreferenceManager.getDefaultSharedPreferences(context.getString(key, "default"));

Alternatively, like many have said, you can manually check the default SharedPreferences file located in /data/data/YOUR_PACKAGE_NAME/shared_prefs/YOUR_PACKAGE_NAME_preferences.xml inside your app data folder, on the device you are testing on.

score 1 · Answer 2 · answered Oct 01 '18 at 07:42

The shared preference does not get cleared until you clear the editor. Make sure when you are testing the screen again, the editor is not getting cleared. Only then the preference may get cleared out.

To access the shared.xml folder, you can follow this link

How can I view the shared preferences file using Android Studio?

How to test shared preference

2 Answers2