gistfile1.txt

plugins {
    application
    kotlin("jvm") version "1.3.20"
}

application {
    mainClassName = "org.example.MyLibrary.kt"
}

dependencies {
    compile(kotlin("stdlib"))
    implementation(kotlin("reflect"))
    testImplementation(kotlin("test"))
    testImplementation(kotlin("test-junit"))
}

repositories {
    jcenter()
}

gistfile2.txt

package org.example

data class Language( val name: String, val hotness: Int)

class MyLibrary {
    fun kotlinLanguage() = Language("kotlin", 10)

    fun main() {
        val abc = "Nitesh"
        println("${abc::class.qualifiedName}")
    }
}

gistfile3.txt

package org.example

import org.junit.Assert.assertEquals
import org.junit.Test

class MyLibraryTest {
    @Test fun testMyLanguage() {
        assertEquals("kotlin", MyLibrary().kotlinLanguage().name)
        assertEquals(10, MyLibrary().kotlinLanguage().hotness)
    }
}