/*
 * Copyright 2018, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.testing.espresso.BasicSample

import androidx.test.ext.junit.rules.activityScenarioRule
import android.app.Activity
import androidx.test.core.app.ActivityScenario
import androidx.test.core.app.launchActivity
import androidx.test.espresso.Espresso.onView
import androidx.test.espresso.action.ViewActions
import androidx.test.espresso.action.ViewActions.*
import androidx.test.espresso.assertion.ViewAssertions.matches
import androidx.test.espresso.matcher.ViewMatchers
import androidx.test.espresso.matcher.ViewMatchers.withId
import androidx.test.espresso.matcher.ViewMatchers.withText
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.LargeTest
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith


/**
 * The kotlin equivalent to the ChangeTextBehaviorTest, that
 * showcases simple view matchers and actions like [ViewMatchers.withId],
 * [ViewActions.click] and [ViewActions.typeText], and ActivityScenarioRule
 *
 *
 * Note that there is no need to tell Espresso that a view is in a different [Activity].
 */
@RunWith(AndroidJUnit4::class)
@LargeTest
class ChangeTextBehaviorKtTest {

    /**
     * Use [ActivityScenarioRule] to create and launch the activity under test before each test,
     * and close it after each test. This is a replacement for
     * [androidx.test.rule.ActivityTestRule].
     */
    @get:Rule var activityScenarioRule = activityScenarioRule<MainActivity>()

    @Test
    fun changeText_sameActivity() {

        // Type text and then press the button.
        onView(withId(R.id.editTextUserInput))
                .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard())
        onView(withId(R.id.changeTextBt)).perform(click())

        // Check that the text was changed.
        onView(withId(R.id.textToBeChanged)).check(matches(withText(STRING_TO_BE_TYPED)))
    }

    @Test
    fun changeText_newActivity() {
        // Type text and then press the button.
        onView(withId(R.id.editTextUserInput)).perform(typeText(STRING_TO_BE_TYPED),
                closeSoftKeyboard())
        onView(withId(R.id.activityChangeTextBtn)).perform(click())

        // This view is in a different Activity, no need to tell Espresso.
        onView(withId(R.id.show_text_view)).check(matches(withText(STRING_TO_BE_TYPED)))
    }

    companion object {

        val STRING_TO_BE_TYPED = "Espresso"
    }
}

If you're using Android Studio, then you can also use it to write and run your tests.

However, if you decide to manually export the results to an XML file, that format is not a JUnit XML compatible one in is thus not supported.

# run }

the tests in the companion object {

        val STRING_TO_BE_TYPED = "Espresso"
    }
}

You may start an emulator from within Android Studio (Tools => AVD Manager).

Image Added

You may also use the command line, for example:

emulator -avd Pixel_XL_API_29

If you need to find out the name of the AVD, you may use:

emulator -list-avds

./gradlew app:connectedCheck
# ...or...
# gradle clean cleanTest test