Unit tested the UserAgendaRepo for Droidcon-Boston#138.

Droidcon-Boston/app/build.gradle

@@ -18,6 +18,7 @@ android {
         versionCode 17
         versionName "2.0.9"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        multiDexEnabled true
 
         vectorDrawables {
             useSupportLibrary = true
@@ -97,8 +98,10 @@ dependencies {
     final flexibleAdapter = '5.0.1'
     final flexibleAdapterUi = '1.0.0-b3'
     final glide = '3.7.0'
+    final threeTen = '1.3.3'
     final threeTenAbp = '1.0.5'
     final recyclerRefreshLayout = '2.0.5'
+    final mockitoCore = '2.23.4'
     //endregion
 
     //region Dependencies
@@ -107,7 +110,8 @@ dependencies {
 
     // TESTING
     testImplementation "junit:junit:$junit"
-    testImplementation "org.threeten:threetenbp:1.3.3"
+    testImplementation "org.threeten:threetenbp:$threeTen"
+    testImplementation "org.mockito:mockito-core:$mockitoCore"
 
     // Support
     implementation "androidx.appcompat:appcompat:$appCompat"

Droidcon-Boston/app/src/test/java/com/mentalmachines/droidcon_boston/data/UserAgendaRepoTest.kt

@@ -0,0 +1,37 @@
+package com.mentalmachines.droidcon_boston.data
+
+import android.content.Context
+import android.content.SharedPreferences
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.mockito.ArgumentMatchers.*
+import org.mockito.Mockito.`when`
+import org.mockito.Mockito.mock
+
+class UserAgendaRepoTest {
+    private val mockSharedPrefs = mock(SharedPreferences::class.java)
+    private val mockEditor = mock(SharedPreferences.Editor::class.java)
+    private val mockContext = mock(Context::class.java)
+    private lateinit var userAgendaRepo: UserAgendaRepo
+
+    @Before
+    fun setup() {
+        `when`(mockContext.getSharedPreferences(anyString(), anyInt())).thenReturn(mockSharedPrefs)
+        `when`(mockSharedPrefs.edit()).thenReturn(mockEditor)
+        `when`(mockEditor.putStringSet(anyString(), any())).thenReturn(mockEditor)
+        userAgendaRepo = UserAgendaRepo.getInstance(mockContext)
+    }
+
+    @Test
+    fun testBookmarkAndRemove() {
+        val sessionId = "Session ID"
+        assertFalse(userAgendaRepo.isSessionBookmarked(sessionId))
+
+        userAgendaRepo.bookmarkSession(sessionId, true)
+        assertTrue(userAgendaRepo.isSessionBookmarked(sessionId))
+
+        userAgendaRepo.bookmarkSession(sessionId, false)
+        assertFalse(userAgendaRepo.isSessionBookmarked(sessionId))
+    }
+}