The ideal structure of a Gradle file only declares the dependencies it needs.

build.gradle.kts

import org.jetbrains.kotlin.gradle.plugin.getKotlinPluginVersion

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-stdlib:${getKotlinPluginVersion()}")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.5")
    implementation("com.jakewharton.threetenabp:threetenabp:1.2.3")
    implementation("com.squareup.okhttp3:okhttp:4.5.0")

    testImplementation("junit:junit:4.13")
    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.5")
    testImplementation("io.mockk:mockk:1.9.3")
    testImplementation("org.amshove.kluent:kluent-android:1.61")
}