Moved tests over to Kotlin. (commons-app#1428)

Author: psh

app/build.gradle

@@ -18,11 +18,12 @@ dependencies {
     implementation 'com.google.code.gson:gson:2.8.1'
     implementation 'com.jakewharton.timber:timber:4.5.1'
     implementation 'info.debatty:java-string-similarity:0.24'
+    implementation 'com.borjabravo:readmoretextview:2.1.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     implementation ('com.mapbox.mapboxsdk:mapbox-android-sdk:5.4.1@aar'){
         transitive=true
     }
 
-
     implementation "com.android.support:support-v4:$SUPPORT_LIB_VERSION"
     implementation "com.android.support:appcompat-v7:$SUPPORT_LIB_VERSION"
     implementation "com.android.support:design:$SUPPORT_LIB_VERSION"
@@ -41,8 +42,6 @@ dependencies {
     // explicitly depend on RxJava's latest version for bug fixes and new features.
     implementation 'com.android.support:multidex:1.0.3'
 
-    testImplementation "org.robolectric:multidex:3.4.2"
-
     implementation 'io.reactivex.rxjava2:rxjava:2.1.2'
     implementation 'com.jakewharton.rxbinding2:rxbinding:2.0.0'
     implementation 'com.jakewharton.rxbinding2:rxbinding-support-v4:2.0.0'
@@ -54,33 +53,25 @@ dependencies {
 
     implementation "com.google.dagger:dagger:$DAGGER_VERSION"
     implementation "com.google.dagger:dagger-android-support:$DAGGER_VERSION"
-
     kapt "com.google.dagger:dagger-android-processor:$DAGGER_VERSION"
     kapt "com.google.dagger:dagger-compiler:$DAGGER_VERSION"
 
+    testImplementation "org.robolectric:multidex:3.4.2"
     testImplementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
-    androidTestImplementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
-
+    testImplementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.robolectric:robolectric:3.7.1'
-    testImplementation 'org.mockito:mockito-all:1.10.19'
-
+    testImplementation 'com.nhaarman:mockito-kotlin:1.5.0'
     testImplementation 'com.squareup.okhttp3:mockwebserver:3.8.1'
+
+    androidTestImplementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
     androidTestImplementation 'com.squareup.okhttp3:mockwebserver:3.8.1'
     androidTestImplementation "com.android.support:support-annotations:$SUPPORT_LIB_VERSION"
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2-alpha1'
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:$LEAK_CANARY"
     releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$LEAK_CANARY"
     testImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$LEAK_CANARY"
-
-    implementation "com.google.dagger:dagger:$DAGGER_VERSION"
-    implementation "com.google.dagger:dagger-android-support:$DAGGER_VERSION"
-    kapt "com.google.dagger:dagger-compiler:$DAGGER_VERSION"
-    kapt "com.google.dagger:dagger-android-processor:$DAGGER_VERSION"
-
-    implementation 'com.borjabravo:readmoretextview:2.1.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
 }
 
 android {

app/src/main/java/fr/free/nrw/commons/category/CategoryDao.java

@@ -105,6 +105,7 @@ List<String> recentCategories(int limit) {
         return items;
     }
 
+    @NonNull
     Category fromCursor(Cursor cursor) {
         // Hardcoding column positions!
         return new Category(