update mockito to 2.2.5

build.gradle

@@ -246,7 +246,7 @@ dependencies {
 
     // dependencies for local unit tests
     testImplementation 'junit:junit:4.12'
-    testImplementation 'org.mockito:mockito-core:1.10.19'
+    testImplementation 'org.mockito:mockito-core:2.2.5'
     // dependencies for instrumented tests
     // JUnit4 Rules
     androidTestImplementation 'com.android.support.test:rules:1.0.2'