Added a helper class for mocking firebase data for Droidcon-Boston#138.

Droidcon-Boston/app/build.gradle

@@ -102,6 +102,7 @@ dependencies {
     final threeTenAbp = '1.0.5'
     final recyclerRefreshLayout = '2.0.5'
     final mockitoCore = '2.23.4'
+    final archCore = '2.0.0'
     //endregion
 
     //region Dependencies
@@ -112,6 +113,7 @@ dependencies {
     testImplementation "junit:junit:$junit"
     testImplementation "org.threeten:threetenbp:$threeTen"
     testImplementation "org.mockito:mockito-core:$mockitoCore"
+    testImplementation "androidx.arch.core:core-testing:$archCore"
 
     // Support
     implementation "androidx.appcompat:appcompat:$appCompat"

Droidcon-Boston/app/src/main/java/com/mentalmachines/droidcon_boston/data/Schedule.kt

@@ -31,13 +31,13 @@ class Schedule {
         fun getSpeakerString(): String? = speakerNames.joinToString(", ")
     }
 
-    class ScheduleDetail(val listRow: ScheduleRow) {
-
-        var speakerBio: String = ""
-        var twitter: String = ""
-        var linkedIn: String = ""
+    data class ScheduleDetail(
+        val listRow: ScheduleRow,
+        var speakerBio: String = "",
+        var twitter: String = "",
+        var linkedIn: String = "",
         var facebook: String = ""
-
+    ) {
         val id: String get() = listRow.id
     }
 

Droidcon-Boston/app/src/main/java/com/mentalmachines/droidcon_boston/firebase/FirebaseHelper.kt

@@ -7,25 +7,22 @@ import com.google.firebase.database.FirebaseDatabase
 open class FirebaseHelper private constructor() {
 
     private val database: FirebaseDatabase = FirebaseDatabase.getInstance()
-    private val mainDatabase: DatabaseReference
-    val eventDatabase: DatabaseReference
-    val speakerDatabase: DatabaseReference
-    val aboutDatabase: DatabaseReference
-    val faqDatabase: DatabaseReference
-    val cocDatabase: DatabaseReference
-    val volunteerDatabase: DatabaseReference
+    private val mainDatabase: DatabaseReference = database.reference
 
-    init {
+    open val eventDatabase: DatabaseReference =
+        mainDatabase.child("conferenceData").child("events")
+
+    open val speakerDatabase: DatabaseReference =
+        mainDatabase.child("conferenceData").child("speakers")
 
+    open val aboutDatabase: DatabaseReference = mainDatabase.child("about")
+    open val faqDatabase: DatabaseReference = mainDatabase.child("faq")
+    open val cocDatabase: DatabaseReference = mainDatabase.child("conductCode")
+    open val volunteerDatabase: DatabaseReference = mainDatabase.child("volunteers")
+
+    init {
         // Enable disk persistence, https://firebase.google.com/docs/database/android/offline-capabilities
         this.database.setPersistenceEnabled(true)
-        this.mainDatabase = database.reference
-        this.eventDatabase = mainDatabase.child("conferenceData").child("events")
-        this.speakerDatabase = mainDatabase.child("conferenceData").child("speakers")
-        this.volunteerDatabase = mainDatabase.child("volunteers")
-        this.aboutDatabase = mainDatabase.child("about")
-        this.faqDatabase = mainDatabase.child("faq")
-        this.cocDatabase = mainDatabase.child("conductCode")
     }
 
     private object Holder {

Droidcon-Boston/app/src/test/java/com/mentalmachines/droidcon_boston/firebase/FirebaseHelperRobot.kt

@@ -0,0 +1,43 @@
+package com.mentalmachines.droidcon_boston.firebase
+
+import com.google.firebase.database.DataSnapshot
+import com.google.firebase.database.DatabaseReference
+import com.google.firebase.database.ValueEventListener
+import com.mentalmachines.droidcon_boston.data.FirebaseDatabase
+import org.mockito.ArgumentMatchers.anyString
+import org.mockito.Mockito.*
+
+/**
+ * A robot class that can be used to extract out firebase functionality from the tests.
+ *
+ * Mainly we can use this to extract mocking.
+ */
+class FirebaseHelperRobot(mockFirebaseHelper: FirebaseHelper) {
+    private val mockSpeakerReference = mock(DatabaseReference::class.java)
+
+    init {
+        `when`(mockFirebaseHelper.speakerDatabase).thenReturn(mockSpeakerReference)
+        `when`(mockSpeakerReference.orderByChild(anyString())).thenReturn(mockSpeakerReference)
+    }
+
+    fun mockSpeakers(speakers: List<FirebaseDatabase.EventSpeaker>): FirebaseHelperRobot {
+        val speakerSnapshots = speakers.map { speaker ->
+            val mockSnapshot = mock(DataSnapshot::class.java)
+            `when`(mockSnapshot.getValue(FirebaseDatabase.EventSpeaker::class.java)).thenReturn(
+                speaker
+            )
+            return@map mockSnapshot
+        }
+
+        val mockSnapshot = mock(DataSnapshot::class.java)
+        `when`(mockSnapshot.children).thenReturn(speakerSnapshots)
+
+        doAnswer {
+            val valueEventListener = it.arguments.first() as ValueEventListener
+            valueEventListener.onDataChange(mockSnapshot)
+            return@doAnswer null
+        }.`when`(mockSpeakerReference).addValueEventListener(any(ValueEventListener::class.java))
+
+        return this
+    }
+}

Droidcon-Boston/app/src/test/java/com/mentalmachines/droidcon_boston/views/detail/AgendaDetailViewModelTest.kt

@@ -1,12 +1,20 @@
 package com.mentalmachines.droidcon_boston.views.detail
 
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import com.google.firebase.database.DataSnapshot
+import com.google.firebase.database.DatabaseReference
+import com.google.firebase.database.ValueEventListener
+import com.mentalmachines.droidcon_boston.data.FirebaseDatabase
 import com.mentalmachines.droidcon_boston.data.Schedule
 import com.mentalmachines.droidcon_boston.data.UserAgendaRepo
 import com.mentalmachines.droidcon_boston.firebase.FirebaseHelper
+import com.mentalmachines.droidcon_boston.firebase.FirebaseHelperRobot
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
+import org.junit.Rule
 import org.junit.Test
-import org.mockito.Mockito.mock
+import org.mockito.ArgumentMatchers.anyString
+import org.mockito.Mockito.*
 
 class AgendaDetailViewModelTest {
     private val mockAgendaRepo = mock(UserAgendaRepo::class.java)
@@ -16,19 +24,26 @@ class AgendaDetailViewModelTest {
     private val startTime = "2018-03-26T15:00:00.000Z"
     private val endTime = "2018-03-26T15:45:00.000Z"
     private val scheduleId = "Schedule ID"
-    private val speakerNames = listOf("John", "Bob")
+    private val primarySpeakerName = "John"
+    private val secondarySpeakerName = "Bob"
+    private val speakerNames = listOf(primarySpeakerName, secondarySpeakerName)
 
     private val scheduleRow = Schedule.ScheduleRow(
         talkTitle = talkTitle,
         room = talkRoom,
         startTime = startTime,
         endTime = endTime,
         id = scheduleId,
-        speakerNames = speakerNames
+        speakerNames = speakerNames,
+        primarySpeakerName = primarySpeakerName
     )
 
     private val viewModel = AgendaDetailViewModel(scheduleRow, mockAgendaRepo, mockFirebaseHelper)
 
+    @JvmField
+    @Rule
+    val instantTaskExecutor = InstantTaskExecutorRule()
+
     @Test
     fun getTalkTitle() {
         assertEquals(talkTitle, viewModel.talkTitle)
@@ -63,4 +78,15 @@ class AgendaDetailViewModelTest {
     fun bookmarkedWithoutSession() {
         assertFalse(viewModel.isBookmarked)
     }
+
+    @Test
+    fun loadData() {
+        val eventSpeaker = FirebaseDatabase.EventSpeaker(name = primarySpeakerName)
+        FirebaseHelperRobot(mockFirebaseHelper).mockSpeakers(listOf(eventSpeaker))
+
+        viewModel.loadData()
+
+        val scheduleDetail = eventSpeaker.toScheduleDetail(scheduleRow)
+        assertEquals(scheduleDetail, viewModel.scheduleDetail.value)
+    }
 }