ExampleInstrumentedTest.java

    package net.micode.notes;

    import android.content.Context;

    import androidx.test.platform.app.InstrumentationRegistry;
    import androidx.test.ext.junit.runners.AndroidJUnit4;

    import org.junit.Test;
    import org.junit.runner.RunWith;

    import static org.junit.Assert.*;

    /**
     * Instrumented test, which will execute on an Android device.
     *
     * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
     */
    @RunWith(AndroidJUnit4.class)
    public class ExampleInstrumentedTest {
        @Test
        public void useAppContext() {
            // Context of the app under test.
            Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
            assertEquals("net.micode.notes", appContext.getPackageName());
        }
    }