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@RunWith(AndroidJUnit4.class)
public class MainScreenTest {

    @Rule
    public ActivityTestRule<MainActivity> mainActivityActivityTestRule =
            new ActivityTestRule<>(MainActivity.class);

    @Test
    public void floatingActionButton() {
        onView(withId(R.id.floating_action_button))
                .check(matches(isDisplayed()));
    }


12-04 13:55:07.278 28696-28696/com.example.daniellachacz.taskmvvm E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.daniellachacz.taskmvvm, PID: 28696
    java.lang.RuntimeException: Unable to instantiate instrumentation ComponentInfo{com.example.daniellachacz.taskmvvm.test/com.example.daniellachacz.taskmvvm.CustomTestRunner}: java.lang.ClassNotFoundException: Didn't find class "com.example.daniellachacz.taskmvvm.CustomTestRunner" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.example.daniellachacz.taskmvvm.test-1/base.apk", zip file "/data/app/com.example.daniellachacz.taskmvvm-2/base.apk"],nativeLibraryDirectories=[/data/app/com.example.daniellachacz.taskmvvm.test-1/lib/x86, /data/app/com.example.daniellachacz.taskmvvm-2/lib/x86, /vendor/lib, /system/lib]]
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4644)
        at android.app.ActivityThread.-wrap1(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.daniellachacz.taskmvvm.CustomTestRunner" on path: DexPathList[[zip file "/system/framework/android.test.runner.jar", zip file "/data/app/com.example.daniellachacz.taskmvvm.test-1/base.apk", zip file "/data/app/com.example.daniellachacz.taskmvvm-2/base.apk"],nativeLibraryDirectories=[/data/app/com.example.daniellachacz.taskmvvm.test-1/lib/x86, /data/app/com.example.daniellachacz.taskmvvm-2/lib/x86, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4642)
        at android.app.ActivityThread.-wrap1(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    	Suppressed: java.lang.ClassNotFoundException: com.example.daniellachacz.taskmvvm.CustomTestRunner
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        		... 10 more
     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available