[Android, error] androidx 적용

1. Warning Msg:

- 'instrumentationRegistry' is deprecated. Deprecated in Java

- 'AndroidUnit4' is deprecated. Deprecated in Java

2. solve : 

1) build.gradle (module) 파일 > 

1.1) testImplementation 'junit:junit:4.12'  -> androidTestImplementation 'androidx.test.ext:junit:1.1.0' 대체

1.2) Gradle files have changed since last project sync. A project sync ... Sync Now 클릭

android {
    ...
    defaultConfig {
        ...        
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    ...
}

dependencies {
    ...
//    testImplementation 'junit:junit:4.12' 제거
    androidTestImplementation 'androidx.test.ext:junit:1.1.0' // 추가 : junit:junit 대체
    androidTestImplementation 'androidx.test:runner:1.1.2-alpha02'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0-alpha02'
}

2) ExampleInstrumentedTest.kt >

2.1) InstrumentationRegistry.getTargetContext() -> InstrumentationRegistry.getInstrumentation().targetContext 대체

2.2) import 변경

//import android.support.test.InstrumentationRegistry -> androidx.test.platform.app.InstrumentationRegistry 대체

//import android.support.test.runner.AndroidJUnit4 -> androidx.test.ext.junit.runners.AndroidJUnit4 대체

package com.example.com

//import android.support.test.InstrumentationRegistry // deprecated
//import android.support.test.runner.AndroidJUnit4 // deprecated
import androidx.test.ext.junit.runners.AndroidJUnit4 // 추가 : deprecated 대체
import androidx.test.platform.app.InstrumentationRegistry //추가 : deprecated 대체

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

import org.junit.Assert.*

/**
 * Instrumented test, which will execute on an Android device.
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
@RunWith(AndroidJUnit4::class)
class ExampleInstrumentedTest {
    @Test
    fun useAppContext() {
        // Context of the app under test.
//        val appContext = InstrumentationRegistry.getTargetContext() // 제거
        val appContext = InstrumentationRegistry.getInstrumentation().targetContext // 추가 : deprecated 대체
        assertEquals("com.example.com", appContext.packageName)
    }
}