Android: Why Espresso won't run on compileSdkVersion 27?

I started testing my app and had some errors, but managed to fix them and run the test successfully.

Question is: Why this Espresso test won't run on compileSdkVersion 27 ? I tried "old" dependencies but it fails every time.

Here is build.gradle (Module:app) dependencies:

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:design:28.0.0'
//testImplementation 'junit:junit:4.12'
//androidTestImplementation 'com.android.support.test:runner:1.0.2'
//androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
//androidTestImplementation 'com.android.support.test:rules:1.0.2'

// Room components
implementation "android.arch.persistence.room:runtime:$rootProject.roomVersion"
annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomVersion"
androidTestImplementation "android.arch.persistence.room:testing:$rootProject.roomVersion"

// Lifecycle components
implementation "android.arch.lifecycle:extensions:$rootProject.archLifecycleVersion"
annotationProcessor "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion"

// ANDROID X

// Core library
androidTestImplementation 'androidx.test:core:1.0.0'

// AndroidJUnitRunner and JUnit Rules
androidTestImplementation 'androidx.test:runner:1.1.0'
androidTestImplementation 'androidx.test:rules:1.1.0'

// Assertions
androidTestImplementation 'androidx.test.ext:junit:1.0.0'
androidTestImplementation 'androidx.test.ext:truth:1.0.0'
androidTestImplementation 'com.google.truth:truth:0.42'

// Espresso dependencies
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-intents:3.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-accessibility:3.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-web:3.1.0'
androidTestImplementation 'androidx.test.espresso.idling:idling-concurrent:3.1.0'

androidTestImplementation 'androidx.test.espresso:espresso-idling-resource:3.1.0'

androidTestImplementation 'org.hamcrest:hamcrest-library:1.3'
}

Does commented dependencies are the ones I tried using at first, but it fails regardless of "old" or "new" dependencies being used.

Here is the test class:

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

import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.rule.ActivityTestRule;

import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.action.ViewActions.click;
import static androidx.test.espresso.action.ViewActions.typeText;
import static androidx.test.espresso.assertion.ViewAssertions.matches;
import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
import static androidx.test.espresso.matcher.ViewMatchers.withId;

@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {

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

@Test
public void activityLaunch(){
    onView(withId(R.id.fab)).perform(click());
    onView(withId(R.id.edit_word)).check(matches(isDisplayed()));
    onView(withId(R.id.edit_word)).perform(typeText("Hello"));
    onView(withId(R.id.button_save)).perform(click());
    onView(withId(R.id.fab)).check(matches(isDisplayed()));

}
}