ERROR: Gradle DSL method not found: ‘testImplementation()’

Android Studio da yeni bir proje oluşturduğunuzda aşağıdaki hatayı alıyorsanız, sırasıyla resimlerdeki adımları yaptığınızda hatanızı gidermiş olacaksınız.

Java
ERROR: Gradle DSL method not found: 'testImplementation()'
Possible causes:
The project 'My Application' may be using a version of the Android Gradle plug-in that does not contain the method (e.g. 'testCompile' was added in 1.1.0).
Upgrade plugin to version 3.4.0 and sync project
The project 'My Application' may be using a version of Gradle that does not contain the method.
Open Gradle wrapper file
The build file may be missing a Gradle plugin.
Apply Gradle plugin
ERROR: Gradle DSL method not found: 'testImplementation()'
Possible causes:
The project 'My Application' may be using a version of the Android Gradle plug-in that does not contain the method (e.g. 'testCompile' was added in 1.1.0).
Upgrade plugin to version 3.4.0 and sync project
The project 'My Application' may be using a version of Gradle that does not contain the method.
Open Gradle wrapper file
The build file may be missing a Gradle plugin.
Apply Gradle plugin