A modern programming language that makes developers happier.

kotlinlang

```android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
    testOptions {
        unitTests.all {
            useJUnitPlatform {
                includeEngines 'KotlinTest'
             }
        }
    }
    testOptions.unitTests.includeAndroidResources = true
    compileOptions.incremental = true
    useLibrary 'android.test.base'
    useLibrary 'android.test.mock'```