JUnit4-CompositeRules.kt

package com.betclic.test

import org.junit.After
import org.junit.Before

interface Rule {
    fun onBefore() {}
    fun onAfter() {}
}

open class CompositeRules(vararg val rules: Rule) {
    @Before
    fun compositeSetup() {
        rules.forEach { it.onBefore() }
    }

    @After
    fun compositeTearDown() {
        rules.reversed().forEach { it.onAfter() }
    }

    inline fun <reified T : Rule> getRule() = rules.first { it is T } as T
}

// --- Example of test class
class MySuperTest : CompositeRules(RxRule(), MockRule(), WhateverRule()) {
    @Test
    fun myTest() {...}
}