MainActivityExpress.java

package com.example.booksharing21;


import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.action.ViewActions.click;
import static androidx.test.espresso.action.ViewActions.closeSoftKeyboard;
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;

import androidx.test.ext.junit.rules.ActivityScenarioRule;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.SmallTest;

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

@RunWith(AndroidJUnit4.class)
@SmallTest
public class MainActivityExpress {


    private static final String VALID_Email = "john.doe@outlook.com";

    private static final String VALID_Password = "1234john";

    @Rule
    public ActivityScenarioRule<MainActivity> activityRule =
            new ActivityScenarioRule<>(MainActivity.class);


    // android developers https://developer.android.com/training/testing/espresso/basics
    // checking users credentials

    @Test
    public void ValidCredentials() {
        onView(withId(R.id.email)).perform(typeText(VALID_Email), closeSoftKeyboard());
        onView(withId(R.id.password)).perform(typeText(VALID_Password),closeSoftKeyboard()); }
    @Test
    public void WrongEmail(){
        onView(withId(R.id.email)).perform(typeText("john"),closeSoftKeyboard());
        onView(withId(R.id.password)).perform(typeText(VALID_Password),closeSoftKeyboard()); }

    @Test
    public void WrongPassword(){
        onView(withId(R.id.email)).perform(typeText(VALID_Email),closeSoftKeyboard());
        onView(withId(R.id.password)).perform(typeText("doe"),closeSoftKeyboard()); }

    @Test
    public void NoCredentials(){
        onView(withId(R.id.email)).perform(typeText(""),closeSoftKeyboard());
        onView(withId(R.id.password)).perform(typeText(""),closeSoftKeyboard()); }


    @Test
    public void RegButton(){ onView(withId(R.id.reg)).perform(click()); }
    @Test
    public void logButton(){ onView(withId(R.id.log)).perform(click()).check(matches(isDisplayed())); }





}