Android instrumentation tests clear settings in my application

Issue

The problem is:

1. I run my application. Settings are present and everything is fine.
2. I run instrumentation tests (gradle task connectedCheck). Tests not operate with settings (not read, not remove, even don't touch). Test are annotated with @RunWith(AndroidJUnit4.class) and aren't using activities at all.
3. I run my app again and I have to specify settings like I reinstalled my app.

I've tried to specify testApplicationId in gradle buildscript:

android {
...
    defaultConfig {
    ...
    testApplicationId "something.package"

But it has no effect.

Why it is happening, and how to solve this issue?

Solution

According to the Gradle User-guide:

As mentioned previously, checks requiring a connected device are launched with the anchor task called connectedCheck. This depends on the task connectedDebugAndroidTest and therefore will run it. This task does the following:

• Ensure the app and the test app are built (depending on assembleDebug and assembleDebugAndroidTest).
• Install both apps.
• Run the tests.
• Uninstall both apps.

You can use the regular run-configuration to launch tests instead of connectedCheck:

Answered By - The Dreams Wind