diff --git a/detox/android/detox/build.gradle b/detox/android/detox/build.gradle
index 1e7358b86a..01bcc2f7b9 100644
--- a/detox/android/detox/build.gradle
+++ b/detox/android/detox/build.gradle
@@ -1,11 +1,14 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
-def _ext = rootProject.ext;
+def _ext = rootProject.ext
 
-def _compileSdkVersion = _ext.has('compileSdkVersion') ? _ext.compileSdkVersion : 25;
-def _buildToolsVersion = _ext.has('buildToolsVersion') ? _ext.buildToolsVersion : '27.0.3';
-def _minSdkVersion = _ext.has('minSdkVersion') ? _ext.minSdkVersion : 18;
-def _targetSdkVersion = _ext.has('targetSdkVersion') ? _ext.targetSdkVersion : 25;
+def _compileSdkVersion = _ext.has('compileSdkVersion') ? _ext.compileSdkVersion : 25
+def _buildToolsVersion = _ext.has('buildToolsVersion') ? _ext.buildToolsVersion : '27.0.3'
+def _minSdkVersion = _ext.has('minSdkVersion') ? _ext.minSdkVersion : 18
+def _targetSdkVersion = _ext.has('targetSdkVersion') ? _ext.targetSdkVersion : 25
+def _kotlinVersion = _ext.has('detoxKotlinVersion') ? _ext.detoxKotlinVersion : '1.3.0'
 
 android {
     compileSdkVersion _compileSdkVersion
@@ -64,6 +67,8 @@ android {
 }
 
 dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$_kotlinVersion"
+
     minReactNative44Implementation 'com.squareup.okhttp3:okhttp:3.4.1'
     minReactNative44Implementation 'com.squareup.okhttp3:okhttp-ws:3.4.1'
 
@@ -84,4 +89,6 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.assertj:assertj-core:3.8.0'
     testImplementation 'org.apache.commons:commons-io:1.3.2'
+    testImplementation 'com.nhaarman:mockito-kotlin:1.4.0'
+    testImplementation "com.facebook.react:react-native:+"
 }
diff --git a/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.java b/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.java
deleted file mode 100644
index 013c99b469..0000000000
--- a/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.java
+++ /dev/null
@@ -1,198 +0,0 @@
-package com.wix.detox.espresso;
-
-import android.support.annotation.NonNull;
-import android.support.test.espresso.IdlingResource;
-import android.util.Log;
-import android.view.Choreographer;
-
-import org.joor.Reflect;
-import org.joor.ReflectException;
-
-import java.util.PriorityQueue;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-/**
- * Created by simonracz on 23/05/2017.
- */
-
-/**
- * <p>
- * Espresso IdlingResource for React Native js timers.
- * </p>
- *
- * <p>
- * Hooks up to React Native internals to grab the timers queue from it.
- * </p>
- * <p>
- * This resource is considered idle if the Timers priority queue is empty or
- * the one scheduled the soonest is still too far in the future.
- * </p>
- */
-public class ReactNativeTimersIdlingResource implements IdlingResource, Choreographer.FrameCallback {
-    private static final String LOG_TAG = "Detox";
-
-    private final static String CLASS_TIMING = "com.facebook.react.modules.core.Timing";
-    private final static String METHOD_GET_NATIVE_MODULE = "getNativeModule";
-    private final static String METHOD_HAS_NATIVE_MODULE = "hasNativeModule";
-    private final static String FIELD_TIMERS = "mTimers";
-    private final static String TIMER_FIELD_TARGET_TIME = "mTargetTime";
-    private final static String TIMER_FIELD_INTERVAL = "mInterval";
-    private final static String TIMER_FIELD_REPETITIVE = "mRepeat";
-    private final static String FIELD_CATALYST_INSTANCE = "mCatalystInstance";
-    private final static String LOCK_TIMER = "mTimerGuard";
-
-    private AtomicBoolean paused = new AtomicBoolean(false);
-
-    private static final long LOOK_AHEAD_MS = 1500;
-
-    private ResourceCallback callback = null;
-    private Object reactContext = null;
-
-    public ReactNativeTimersIdlingResource(@NonNull Object reactContext) {
-        this.reactContext = reactContext;
-    }
-
-    @Override
-    public String getName() {
-        return ReactNativeTimersIdlingResource.class.getName();
-    }
-
-    @Override
-    public boolean isIdleNow() {
-        if (paused.get()) {
-            return true;
-        }
-
-        Class<?> timingClass;
-        try {
-            timingClass = Class.forName(CLASS_TIMING);
-        } catch (ClassNotFoundException e) {
-            Log.e(LOG_TAG, "Can't find Timing or Timing$Timer classes");
-            if (callback != null) {
-                callback.onTransitionToIdle();
-            }
-            return true;
-        }
-
-        try {
-            // reactContext.hasActiveCatalystInstance() should be always true here
-            // if called right after onReactContextInitialized(...)
-            if (Reflect.on(reactContext).field(FIELD_CATALYST_INSTANCE).get() == null) {
-                Log.e(LOG_TAG, "No active CatalystInstance. Should never see this.");
-                return false;
-            }
-
-            if (!(boolean)Reflect.on(reactContext).call(METHOD_HAS_NATIVE_MODULE, timingClass).get()) {
-                Log.e(LOG_TAG, "Can't find Timing NativeModule");
-                if (callback != null) {
-                    callback.onTransitionToIdle();
-                }
-                return true;
-            }
-
-            final Object timingModule = Reflect.on(reactContext).call(METHOD_GET_NATIVE_MODULE, timingClass).get();
-            final Object timerLock = Reflect.on(timingModule).field(LOCK_TIMER).get();
-            synchronized (timerLock) {
-                final PriorityQueue<?> timers = Reflect.on(timingModule).field(FIELD_TIMERS).get();
-                final Object nextTimer = findNextTimer(timers);
-                if (nextTimer == null) {
-                    if (callback != null) {
-                        callback.onTransitionToIdle();
-                    }
-                    return true;
-                }
-
-//                Log.i(LOG_TAG, "Num of Timers : " + timers.size());
-
-                if (isTimerOutsideBusyWindow(nextTimer)) {
-                    if (callback != null) {
-                        callback.onTransitionToIdle();
-                    }
-                    return true;
-                }
-            }
-
-            Choreographer.getInstance().postFrameCallback(this);
-            Log.i(LOG_TAG, "JS Timer is busy");
-            return false;
-        } catch (ReflectException e) {
-            Log.e(LOG_TAG, "Can't set up RN timer listener", e.getCause());
-        }
-
-        if (callback != null) {
-            callback.onTransitionToIdle();
-        }
-        return true;
-    }
-
-    @Override
-    public void registerIdleTransitionCallback(ResourceCallback callback) {
-        this.callback = callback;
-
-        Choreographer.getInstance().postFrameCallback(this);
-    }
-
-    @Override
-    public void doFrame(long frameTimeNanos) {
-        isIdleNow();
-    }
-
-    public void pause() {
-        paused.set(true);
-        if (callback != null) {
-            callback.onTransitionToIdle();
-        }
-    }
-    public void resume() {
-        paused.set(false);
-    }
-
-    private Object findNextTimer(PriorityQueue<?> timers) {
-        Object nextTimer = timers.peek();
-        if (nextTimer == null) {
-            return null;
-        }
-
-        final boolean isRepetitive = Reflect.on(nextTimer).field(TIMER_FIELD_REPETITIVE).get();
-        if (!isRepetitive) {
-            return nextTimer;
-        }
-
-        Object timer = null;
-        long targetTime = Long.MAX_VALUE;
-        for (Object aTimer : timers) {
-            final boolean timerIsRepetitive = Reflect.on(aTimer).field(TIMER_FIELD_REPETITIVE).get();
-            final long timerTargetTime = Reflect.on(aTimer).field(TIMER_FIELD_TARGET_TIME).get();
-            if (!timerIsRepetitive && timerTargetTime < targetTime) {
-                targetTime = timerTargetTime;
-                timer = aTimer;
-            }
-        }
-        return timer;
-    }
-
-    private boolean isTimerOutsideBusyWindow(Object nextTimer) {
-        final long currentTimeMS = System.nanoTime() / 1000000L;
-        final Reflect nextTimerReflected = Reflect.on(nextTimer);
-        final long targetTimeMS = nextTimerReflected.field(TIMER_FIELD_TARGET_TIME).get();
-        final int intervalMS = nextTimerReflected.field(TIMER_FIELD_INTERVAL).get();
-
-//        Log.i(LOG_TAG, "Next timer has duration of: " + intervalMS
-//                + "; due time is: " + targetTimeMS + ", current is: " + currentTimeMS);
-
-        // Core condition is for the timer interval (duration) to be set beyond our window.
-        // Note: we check the interval in an 'absolute' way rather than comparing to the 'current time'
-        //    since it always takes a while till we get dispatched (compared to when the timer was created),
-        //    and that could make a significant difference in timers set close to our window (up to ~ LOOK_AHEAD_MS+200ms).
-        if (intervalMS > LOOK_AHEAD_MS) {
-            return true;
-        }
-
-        // Edge case: timer has expired during this probing process and is yet to have left the queue.
-        if (targetTimeMS <= currentTimeMS) {
-            return true;
-        }
-
-        return false;
-    }
-}
diff --git a/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.kt b/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.kt
new file mode 100644
index 0000000000..a5988fc96c
--- /dev/null
+++ b/detox/android/detox/src/main/java/com/wix/detox/espresso/ReactNativeTimersIdlingResource.kt
@@ -0,0 +1,115 @@
+package com.wix.detox.espresso
+
+import android.support.test.espresso.IdlingResource
+import android.view.Choreographer
+import com.facebook.react.bridge.ReactContext
+import com.facebook.react.modules.core.Timing
+import org.joor.Reflect
+import java.util.*
+import java.util.concurrent.atomic.AtomicBoolean
+
+const val BUSY_WINDOW_THRESHOLD = 1500
+
+class TimerReflected(timer: Any) {
+    private var reflected = Reflect.on(timer)
+
+    val isRepeating: Boolean
+        get() = reflected.field("mRepeat").get()
+
+    val interval: Int
+        get() = reflected.field("mInterval").get()
+
+    val targetTime: Long
+        get() = reflected.field("mTargetTime").get()
+}
+
+class TimingModuleReflected(reactContext: ReactContext) {
+    private var nativeModule = reactContext.getNativeModule(Timing::class.java)
+
+    val timersQueue: PriorityQueue<Any>
+        get() = Reflect.on(nativeModule).field("mTimers").get()
+
+    val timersLock: Object
+        get() = Reflect.on(nativeModule).field("mTimerGuard").get()
+
+    operator fun component1() = timersQueue
+    operator fun component2() = timersLock
+}
+
+class ReactNativeTimersIdlingResource @JvmOverloads constructor(
+        private val reactContext: ReactContext,
+        private val getChoreographer: () -> Choreographer = { Choreographer.getInstance() }
+    ) : IdlingResource, Choreographer.FrameCallback {
+
+    private var callback: IdlingResource.ResourceCallback? = null
+    private var paused = AtomicBoolean(false)
+
+    override fun getName(): String = this.javaClass.name
+
+    override fun registerIdleTransitionCallback(callback: IdlingResource.ResourceCallback?) {
+        this.callback = callback
+        getChoreographer().postFrameCallback(this)
+    }
+
+    override fun isIdleNow(): Boolean {
+        if (paused.get()) {
+            return true
+        }
+
+        return checkIdle().apply {
+            val result = this
+            if (result) {
+                callback?.onTransitionToIdle()
+            } else {
+                getChoreographer().postFrameCallback(this@ReactNativeTimersIdlingResource)
+            }
+        }
+    }
+
+    override fun doFrame(frameTimeNanos: Long) {
+        callback?.let {
+            isIdleNow
+        }
+    }
+
+    public fun pause() {
+        paused.set(true)
+        callback?.onTransitionToIdle()
+    }
+
+    public fun resume() {
+        paused.set(false)
+    }
+
+    private fun checkIdle(): Boolean {
+        val now = System.nanoTime() / 1000000L
+        val (timersQueue, timersLock) = TimingModuleReflected(reactContext)
+
+        synchronized(timersLock) {
+            val nextTimer = timersQueue.peek()
+            nextTimer?.let {
+                return !isTimerInBusyWindow(it, now) && !hasBusyTimers(timersQueue, now)
+            }
+            return true
+        }
+    }
+
+    private fun isTimerInBusyWindow(timer: Any, now: Long): Boolean {
+        val timerReflected = TimerReflected(timer)
+        return when {
+            timerReflected.isRepeating -> false
+            timerReflected.targetTime < now -> false
+            timerReflected.interval > BUSY_WINDOW_THRESHOLD -> false
+            else -> true
+        }
+    }
+
+    private fun hasBusyTimers(timersQueue: PriorityQueue<Any>, now: Long): Boolean {
+        timersQueue.forEach {
+            if (isTimerInBusyWindow(it, now)) {
+                return true
+            }
+        }
+        return false
+    }
+}
diff --git a/detox/android/detox/src/test/java/com/wix/detox/espresso/ReactNativeTimersIdlingResourceTest.kt b/detox/android/detox/src/test/java/com/wix/detox/espresso/ReactNativeTimersIdlingResourceTest.kt
new file mode 100644
index 0000000000..23f895e561
--- /dev/null
+++ b/detox/android/detox/src/test/java/com/wix/detox/espresso/ReactNativeTimersIdlingResourceTest.kt
@@ -0,0 +1,254 @@
+package com.wix.detox.espresso
+
+import android.support.test.espresso.IdlingResource.ResourceCallback
+import android.view.Choreographer
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.modules.core.Timing
+import com.nhaarman.mockito_kotlin.*
+import org.assertj.core.api.Assertions.assertThat
+import org.joor.Reflect
+import org.junit.Before
+import org.junit.Test
+import org.mockito.ArgumentMatchers
+import java.util.*
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+
+const val BUSY_INTERVAL_MS = 1500
+const val MEANINGFUL_TIMER_INTERVAL = BUSY_INTERVAL_MS
+
+fun now() = System.nanoTime() / 1000000L
+
+fun aTimer(interval: Int, isRepeating: Boolean) = aTimer(now() + interval + 10, interval, isRepeating)
+
+fun aTimer(targetTime: Long, interval: Int, isRepeating: Boolean): Any {
+    val timerClass = Class.forName("com.facebook.react.modules.core.Timing\$Timer")
+    return Reflect.on(timerClass).create(-1, targetTime, interval, isRepeating).get()
+}
+
+fun aOneShotTimer(interval: Int) = aTimer(interval, false)
+fun aRepeatingTimer(interval: Int) = aTimer(interval, true)
+fun anOverdueTimer() = aTimer(now() - 100, 123, false)
+
+fun aIdlingResourceCallback() = mock<ResourceCallback>()
+
+class ReactNativeTimersIdlingResourceTest {
+
+    private lateinit var reactAppContext: ReactApplicationContext
+    private lateinit var timersLock: String
+    private lateinit var timersNativeModule: Timing
+    private lateinit var choreographer: Choreographer
+    private lateinit var pendingTimers: PriorityQueue<Any>
+
+    @Before fun setUp() {
+        pendingTimers = PriorityQueue(2) { _, _ -> 0}
+
+        timersNativeModule = mock()
+        timersLock = "Lock-Mock"
+        Reflect.on(timersNativeModule).set("mTimers", pendingTimers)
+        Reflect.on(timersNativeModule).set("mTimerGuard", timersLock)
+
+        choreographer = mock()
+
+        reactAppContext = mock {
+            on { hasNativeModule<Timing>(ArgumentMatchers.any()) }.doReturn(true)
+            on { getNativeModule<Timing>(ArgumentMatchers.any()) }.doReturn(timersNativeModule)
+        }
+    }
+
+    @Test fun `should be idle if there are no timers in queue`() {
+        assertThat(uut().isIdleNow).isTrue()
+    }
+
+    @Test fun `should transition to idle if found idle in query`() {
+        val callback = aIdlingResourceCallback()
+
+        with(uut()) {
+            registerIdleTransitionCallback(callback)
+            isIdleNow
+        }
+
+        verify(callback).onTransitionToIdle()
+    }
+
+    @Test fun `should NOT transition to idle if found busy in query`() {
+        val callback = aIdlingResourceCallback()
+
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        with(uut()) {
+            registerIdleTransitionCallback(callback)
+            isIdleNow
+        }
+
+        verify(callback, never()).onTransitionToIdle()
+    }
+
+    @Test fun `should be busy if there's a meaningful pending timer`() {
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+        assertThat(uut().isIdleNow).isFalse()
+    }
+
+    @Test fun `should be idle if pending timer is too far away (ie not meaningful)`() {
+        givenTimer(aOneShotTimer(BUSY_INTERVAL_MS + 1))
+        assertThat(uut().isIdleNow).isTrue()
+    }
+
+    @Test fun `should be idle if the only timer is a repeating one`() {
+        givenTimer(aRepeatingTimer(MEANINGFUL_TIMER_INTERVAL))
+        assertThat(uut().isIdleNow).isTrue()
+    }
+
+    @Test fun `should be busy if a meaningful pending timer lies beyond a repeating one`() {
+        givenTimer(aRepeatingTimer(BUSY_INTERVAL_MS / 10))
+        givenTimer(aOneShotTimer(BUSY_INTERVAL_MS))
+        assertThat(uut().isIdleNow).isFalse()
+    }
+
+    @Test fun `should be idle if the only timer is overdue (due in the past)`() {
+        givenTimer(anOverdueTimer())
+        assertThat(uut().isIdleNow).isTrue()
+    }
+
+    @Test fun `should be busy if has a meaningful pending timer set beyond an overdue timer`() {
+        givenTimer(anOverdueTimer())
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+        assertThat(uut().isIdleNow).isFalse()
+    }
+
+    @Test fun `should be idle if paused`() {
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        val uut = uut().apply {
+            pause()
+        }
+
+        assertThat(uut.isIdleNow).isTrue()
+    }
+
+    @Test fun `should be busy if paused and resumed`() {
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        val uut = uut().apply {
+            pause()
+            resume()
+        }
+
+        assertThat(uut.isIdleNow).isFalse()
+    }
+
+    @Test fun `should notify of transition to idle upon pausing`() {
+        val callback = aIdlingResourceCallback()
+
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        with(uut()) {
+            registerIdleTransitionCallback(callback)
+            pause()
+        }
+
+        verify(callback).onTransitionToIdle()
+    }
+
+    @Test fun `should enqueue an is-idle check using choreographer when a callback gets registered`() {
+        with(uut()) {
+            registerIdleTransitionCallback(mock())
+        }
+
+        verify(choreographer).postFrameCallback(any())
+    }
+
+    @Test fun `should transition to idle when preregistered choreographer is dispatched`() {
+        val callback = aIdlingResourceCallback()
+
+        uut().registerIdleTransitionCallback(callback)
+        invokeChoreographerCallback()
+
+        verify(callback).onTransitionToIdle()
+    }
+
+    @Test fun `should NOT transition to idle if not idle when preregistered choreographer is dispatched`() {
+        val callback = aIdlingResourceCallback()
+
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        uut().registerIdleTransitionCallback(callback)
+        invokeChoreographerCallback()
+
+        verify(callback, never()).onTransitionToIdle()
+    }
+
+    @Test fun `should re-register choreographer if found idle while preregistered choreographer is dispatched`() {
+        val callback = aIdlingResourceCallback()
+
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        val uut = uut()
+        uut.registerIdleTransitionCallback(callback)
+        invokeChoreographerCallback()
+
+        verify(choreographer, times(2)).postFrameCallback(any())
+    }
+
+    @Test fun `should adhere to pausing also when invoked via choreographer callback`() {
+        val callback = aIdlingResourceCallback()
+
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+
+        uut().apply {
+            pause()
+            registerIdleTransitionCallback(callback)
+        }
+        val runtimeChoreographerCallback = getChoreographerCallback()
+
+        reset(callback, choreographer)
+        runtimeChoreographerCallback.doFrame(0L)
+
+        verify(callback, never()).onTransitionToIdle()
+        verify(choreographer, never()).postFrameCallback(any())
+    }
+
+    @Test fun `should enqueue an additional idle check (using choreographer) if found busy`() {
+        givenTimer(aOneShotTimer(MEANINGFUL_TIMER_INTERVAL))
+        uut().isIdleNow
+        verify(choreographer).postFrameCallback(any())
+    }
+
+    @Test fun `should NOT enqueue an additional idle check (using choreographer) if found idle`() {
+        givenTimer(aOneShotTimer(BUSY_INTERVAL_MS + 1))
+        uut().isIdleNow
+        verify(choreographer, never()).postFrameCallback(any())
+    }
+
+    @Test fun `should yield to other threads using the timers module`() {
+        val executor = Executors.newSingleThreadExecutor()
+        var isIdle: Boolean? = null
+
+        synchronized(timersLock) {
+            executor.submit {
+                isIdle = uut().isIdleNow
+            }
+            executor.awaitTermination(100L, TimeUnit.MILLISECONDS)
+            assertThat(isIdle).isNull()
+        }
+        executor.awaitTermination(100L, TimeUnit.MILLISECONDS)
+        assertThat(isIdle).isNotNull()
+    }
+
+    private fun uut() = ReactNativeTimersIdlingResource(reactAppContext) { choreographer }
+
+    private fun givenTimer(timer: Any) {
+        pendingTimers.add(timer)
+    }
+
+    private fun invokeChoreographerCallback() {
+        getChoreographerCallback().doFrame(0L)
+    }
+
+    private fun getChoreographerCallback(): Choreographer.FrameCallback {
+        argumentCaptor<Choreographer.FrameCallback>().apply {
+            verify(choreographer).postFrameCallback(capture())
+            return firstValue
+        }
+    }
+}
diff --git a/detox/android/detox/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker b/detox/android/detox/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker
new file mode 100644
index 0000000000..1f0955d450
--- /dev/null
+++ b/detox/android/detox/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker
@@ -0,0 +1 @@
+mock-maker-inline
diff --git a/detox/test/android/build.gradle b/detox/test/android/build.gradle
index 4fc0a7a28b..f49d0b9c7a 100644
--- a/detox/test/android/build.gradle
+++ b/detox/test/android/build.gradle
@@ -1,12 +1,17 @@
 buildscript {
+    ext.kotlinVersion = '1.3.0'
+    ext.detoxKotlinVerion = ext.kotlinVersion
+
     repositories {
         google()
         mavenLocal()
         jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.4'
         classpath 'de.undercouch:gradle-download-task:3.4.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
     }
 }