diff --git a/Corona-Warn-App/src/device/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt b/Corona-Warn-App/src/device/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt
new file mode 100644
index 00000000000..e808fc11762
--- /dev/null
+++ b/Corona-Warn-App/src/device/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt
@@ -0,0 +1,11 @@
+package de.rki.coronawarnapp.nearby
+
+import com.google.android.gms.nearby.Nearby
+import com.google.android.gms.nearby.exposurenotification.ExposureNotificationClient
+import de.rki.coronawarnapp.CoronaWarnApplication
+
+object ExposureNotificationClientFactory {
+    fun createClient(): ExposureNotificationClient {
+        return Nearby.getExposureNotificationClient(CoronaWarnApplication.getAppContext())
+    }
+}
diff --git a/Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt b/Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt
new file mode 100644
index 00000000000..97efd3979d2
--- /dev/null
+++ b/Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/nearby/ExposureNotificationClientFactory.kt
@@ -0,0 +1,93 @@
+package de.rki.coronawarnapp.nearby
+
+import android.util.Log
+import com.google.android.gms.common.api.Api
+import com.google.android.gms.common.api.internal.ApiKey
+import com.google.android.gms.nearby.exposurenotification.ExposureConfiguration
+import com.google.android.gms.nearby.exposurenotification.ExposureInformation
+import com.google.android.gms.nearby.exposurenotification.ExposureNotificationClient
+import com.google.android.gms.nearby.exposurenotification.ExposureSummary
+import com.google.android.gms.nearby.exposurenotification.TemporaryExposureKey
+import com.google.android.gms.tasks.Task
+import com.google.android.gms.tasks.Tasks
+import java.io.File
+
+object ExposureNotificationClientFactory {
+    fun createClient(): ExposureNotificationClient {
+        return MockExposureNotificationClient()
+    }
+}
+
+private class MockExposureNotificationClient : ExposureNotificationClient {
+    companion object {
+        private const val TAG = "MockExposureNotificationClient"
+    }
+
+    private var enabled: Boolean = false
+
+    override fun isEnabled(): Task<Boolean> {
+        Log.w(TAG, "isEnabled()")
+
+        return Tasks.forResult(enabled)
+    }
+
+    override fun provideDiagnosisKeys(
+        p0: MutableList<File>?,
+        p1: ExposureConfiguration?,
+        p2: String?
+    ): Task<Void> {
+        Log.w(TAG, "provideDiagnosisKeys()")
+
+        return Tasks.forResult(null)
+    }
+
+    override fun getExposureSummary(p0: String?): Task<ExposureSummary> {
+        Log.w(TAG, "getExposureSummary()")
+
+        val builder = ExposureSummary.ExposureSummaryBuilder()
+
+        builder.setAttenuationDurations(intArrayOf(
+            50,
+            10,
+            5
+        ))
+        builder.setDaysSinceLastExposure(1)
+        builder.setMatchedKeyCount(1)
+        builder.setMaximumRiskScore(50)
+        builder.setSummationRiskScore(70)
+
+        return Tasks.forResult(builder.build())
+    }
+
+    override fun start(): Task<Void> {
+        Log.w(TAG, "start()")
+
+        enabled = true
+
+        return Tasks.forResult(null)
+    }
+
+    override fun stop(): Task<Void> {
+        Log.w(TAG, "stop()")
+
+        enabled = false
+
+        return Tasks.forResult(null)
+    }
+
+    override fun getExposureInformation(p0: String?): Task<MutableList<ExposureInformation>> {
+        Log.w(TAG, "getExposureInformation()")
+
+        return Tasks.forResult(null)
+    }
+
+    override fun getApiKey(): ApiKey<Api.ApiOptions.NoOptions> {
+        throw NotImplementedError()
+    }
+
+    override fun getTemporaryExposureKeyHistory(): Task<MutableList<TemporaryExposureKey>> {
+        Log.w(TAG, "getTemporaryExposureKeyHistory()")
+
+        return Tasks.forResult(mutableListOf())
+    }
+}
diff --git a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/nearby/InternalExposureNotificationClient.kt b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/nearby/InternalExposureNotificationClient.kt
index efa21ac8785..58e3098d275 100644
--- a/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/nearby/InternalExposureNotificationClient.kt
+++ b/Corona-Warn-App/src/main/java/de/rki/coronawarnapp/nearby/InternalExposureNotificationClient.kt
@@ -1,6 +1,5 @@
 package de.rki.coronawarnapp.nearby
 
-import com.google.android.gms.nearby.Nearby
 import com.google.android.gms.nearby.exposurenotification.ExposureConfiguration
 import com.google.android.gms.nearby.exposurenotification.ExposureConfiguration.ExposureConfigurationBuilder
 import com.google.android.gms.nearby.exposurenotification.ExposureSummary
@@ -24,7 +23,7 @@ object InternalExposureNotificationClient {
 
     // reference to the client from the Google framework with the given application context
     private val exposureNotificationClient by lazy {
-        Nearby.getExposureNotificationClient(CoronaWarnApplication.getAppContext())
+        ExposureNotificationClientFactory.createClient()
     }
 
     /****************************************************