diff --git a/core/build.gradle b/core/build.gradle
index c68b666d0..65dfa1a7b 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -79,6 +79,7 @@ dependencies {
     }
 
     testImplementation 'junit:junit:4.12'
+    testImplementation 'org.mockito:mockito-core:1.10.19'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test:rules:1.0.2'