Configuration 'testCompile' is obsolete and has been replaced with 'testImplementation'

If you are not able to run the project because you are getting error after an update of Android Gradle plugin in Android Studio.

Here I am giving you the complete solution. Please see below mention steps.

In your gradle file, use new dependency in configurations

Step-1: Go to the build.gradle(module app)

Step-2: Replace compile with an implementation

For Example:

dependencies {    compile 'com.android.support:appcompat-v7:26.+'}

It should be

dependencies {    implementation 'com.android.support:appcompat-v7:26.+'}

Step-3: Replace testCompile with testImplementation

For Example:

testCompile 'junit:junit:4.12'

It should be

testImplementation 'junit:junit:4.12'

Step-4: Replace androidTestCompile with androidTestImplementation

For Example:

androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {        exclude group: 'com.android.support', module: 'support-annotations'    })

It should be

 androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2',

{       

exclude group: 'com.android.support', module: 'support-annotations'   

}) 

Step-5: For library replace compile with api

Step-6: Change classpath com.google.gms:google-services to 'com.google.gms:google-services:3.2.0' (Use latest one)

Step-7: Invalidate Cache and Restart Application (File > Invalidate Cache)

Step-8: Delete .gradle folder

Step-9: Restart application

Enjoy it...