Unit test for repository added

app/build.gradle

@@ -42,8 +42,9 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
-    //mockito
+    //mockito and livedata testing
     testImplementation 'org.mockito:mockito-inline:2.13.0'
+    implementation 'android.arch.core:core-testing'
 
     //Retrofit and GSON
     implementation 'com.squareup.retrofit2:retrofit:2.6.0'

app/src/main/AndroidManifest.xml

@@ -13,7 +13,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".ui.MainActivity">
+        <activity android:name=".ui.main.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/com/example/h_mal/candyspace/data/api/ApiClass.kt

@@ -1,8 +1,7 @@
 package com.example.h_mal.candyspace.data.api
 
-import okhttp3.HttpUrl
+import com.example.h_mal.candyspace.data.api.model.ApiResponse
 import okhttp3.OkHttpClient
-import okhttp3.Request
 import retrofit2.Response
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
@@ -15,17 +14,21 @@ interface ApiClass {
     @GET("users?")
     suspend fun getUsersFromApi(@Query("inname") inname: String): Response<ApiResponse>
 
+    //invoke method creating an invocation of the api call
     companion object{
         operator fun invoke(
+            //injected @params
             networkConnectionInterceptor: NetworkConnectionInterceptor,
             queryParamsInterceptor: QueryParamsInterceptor
         ) : ApiClass{
 
+            //okHttpClient with interceptors
             val okkHttpclient = OkHttpClient.Builder()
                 .addNetworkInterceptor(networkConnectionInterceptor)
                 .addInterceptor(queryParamsInterceptor)
                 .build()
 
+            //retrofit to be used in @Repository
             return Retrofit.Builder()
                 .client(okkHttpclient)
                 .baseUrl("https://api.stackexchange.com/2.2/")

app/src/main/java/com/example/h_mal/candyspace/data/api/model/ApiResponse.kt

@@ -1,4 +1,6 @@
-package com.example.h_mal.candyspace.data.api
+package com.example.h_mal.candyspace.data.api.model
+
+import com.example.h_mal.candyspace.data.api.model.User
 
 data class ApiResponse(
     val items : List<User>?,

app/src/main/java/com/example/h_mal/candyspace/data/api/model/BadgeCounts.kt

@@ -1,4 +1,4 @@
-package com.example.h_mal.candyspace.data.api
+package com.example.h_mal.candyspace.data.api.model
 
 import com.google.gson.annotations.Expose
 import com.google.gson.annotations.SerializedName

app/src/main/java/com/example/h_mal/candyspace/data/api/model/User.kt

@@ -1,4 +1,4 @@
-package com.example.h_mal.candyspace.data.api
+package com.example.h_mal.candyspace.data.api.model
 
 import com.google.gson.annotations.Expose
 import com.google.gson.annotations.SerializedName

app/src/main/java/com/example/h_mal/candyspace/data/repositories/Repository.kt

@@ -1,15 +1,15 @@
 package com.example.h_mal.candyspace.data.repositories
 
-import androidx.lifecycle.LiveData
 import com.example.h_mal.candyspace.data.api.ApiClass
-import com.example.h_mal.candyspace.data.api.ApiResponse
+import com.example.h_mal.candyspace.data.api.model.ApiResponse
 import com.example.h_mal.candyspace.data.api.ResponseUnwrap
-import com.example.h_mal.candyspace.data.api.User
 
 class Repository(
     private val api: ApiClass
 ): ResponseUnwrap() {
 
+    //get api response from retrofit class
+    //then unwrap data object from retrofit response class
     suspend fun getUsers(username: String): ApiResponse {
         return responseUnwrap { api.getUsersFromApi(username) }
     }

app/src/main/java/com/example/h_mal/candyspace/ui/home/MainFragment.kt

@@ -1,26 +1,26 @@
-package com.example.h_mal.candyspace.ui.main
+package com.example.h_mal.candyspace.ui.home
 
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.AdapterView
 import androidx.databinding.DataBindingUtil
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.example.h_mal.candyspace.R
-import com.example.h_mal.candyspace.data.api.User
+import com.example.h_mal.candyspace.data.api.model.User
 import com.example.h_mal.candyspace.databinding.MainFragmentBinding
-import com.example.h_mal.candyspace.ui.MainActivity.Companion.viewModel
-import com.example.h_mal.candyspace.utils.displayToast
+import com.example.h_mal.candyspace.ui.main.MainActivity.Companion.viewModel
+import com.example.h_mal.candyspace.ui.user.ListItemViewModel
+import com.example.h_mal.candyspace.ui.user.UserProfileFragment
 import com.xwray.groupie.GroupAdapter
 import com.xwray.groupie.ViewHolder
 
 
-/*
-* UI for the first screen holding the list, search box
-*/
+/**
+ * UI for the first screen holding the list, search box
+ */
 class MainFragment : Fragment(){
 
     companion object {
@@ -41,26 +41,37 @@ class MainFragment : Fragment(){
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         super.onActivityCreated(savedInstanceState)
-
+        //observer the live data of what is retrieved from the API call
         viewModel.usersLiveData.observe(viewLifecycleOwner, Observer {
+            //create adapter for viewbinding into the recycler view
             val mAdapter = GroupAdapter<ViewHolder>().apply {
                 addAll(it.toUserViewModels())
             }
 
+            //setup the recyclerview
             binding.recyclerView.apply {
                 layoutManager = LinearLayoutManager(context)
                 setHasFixedSize(true)
                 adapter = mAdapter
             }
 
+            /*
+             * Item click listener for recyclerView
+             *
+             */
             mAdapter.setOnItemClickListener { item, _ ->
+                //get the position of the item clicked
                 val i = mAdapter.getAdapterPosition(item)
-
-
+                //set user in @MainViewModel
                 viewModel.setCurrentUser(it[i])
 
+                /**
+                 * display [UserProfileFragment]
+                 */
                 activity!!.supportFragmentManager.beginTransaction()
-                    .replace(R.id.container, UserProfileFragment())
+                    .replace(R.id.container,
+                        UserProfileFragment()
+                    )
                     .addToBackStack("user")
                     .commit()
             }

app/src/main/java/com/example/h_mal/candyspace/ui/main/CompletionListener.kt

@@ -1,5 +1,8 @@
 package com.example.h_mal.candyspace.ui.main
 
+/**
+ * completion listener for [MainViewModel] when handling async calls
+ */
 interface CompletionListener {
     fun onStarted()
     fun onSuccess()

app/src/main/java/com/example/h_mal/candyspace/ui/main/MainActivity.kt

@@ -1,24 +1,22 @@
-package com.example.h_mal.candyspace.ui
+package com.example.h_mal.candyspace.ui.main
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.view.MenuItem
-import android.widget.Toast
 import androidx.lifecycle.ViewModelProvider
 import com.example.h_mal.candyspace.R
-import com.example.h_mal.candyspace.ui.main.CompletionListener
-import com.example.h_mal.candyspace.ui.main.MainFragment
-import com.example.h_mal.candyspace.ui.main.MainViewModel
-import com.example.h_mal.candyspace.ui.main.MainViewModelFactory
+import com.example.h_mal.candyspace.ui.home.MainFragment
 import com.example.h_mal.candyspace.utils.displayToast
 import com.example.h_mal.candyspace.utils.hide
 import com.example.h_mal.candyspace.utils.show
 import kotlinx.android.synthetic.main.main_activity.*
-import org.kodein.di.Kodein
 import org.kodein.di.KodeinAware
 import org.kodein.di.android.kodein
 import org.kodein.di.generic.instance
 
+/**
+ *    [MainActivity] hosting the fragments and controlling a lot of the UI
+ */
 class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
 
     //retrieve the viewmodel factory from the kodein dependency injection
@@ -35,6 +33,7 @@ class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.main_activity)
 
+        //setup home button for back navigation
         supportActionBar?.setDisplayHomeAsUpEnabled(true);
         supportActionBar?.setDisplayShowHomeEnabled(true);
 
@@ -43,11 +42,15 @@ class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
         viewModel.completionListener = this
 
         if (savedInstanceState == null) {
+            //display first fragment
             supportFragmentManager.beginTransaction()
-                .replace(R.id.container, MainFragment())
+                .replace(R.id.container,
+                    MainFragment()
+                )
                 .commit()
         }
 
+        //fragment change listener to display title based on current fragment
         supportFragmentManager.addOnBackStackChangedListener {
             val name = when (supportFragmentManager.fragments[0]::class.java.simpleName) {
                 "UserProfileFragment" -> "User"
@@ -57,6 +60,11 @@ class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
         }
     }
 
+    /*
+    * Back button over override
+    *  - close app if home fragment
+    *  - return to previous fragment if User fragment
+     */
     override fun onBackPressed() {
         if(supportFragmentManager.backStackEntryCount > 0){
             supportFragmentManager.popBackStack()
@@ -66,6 +74,7 @@ class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
 
     }
 
+    //When home button in toolbar is pressed
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
             android.R.id.home -> onBackPressed()
@@ -73,15 +82,21 @@ class MainActivity : AppCompatActivity(), KodeinAware, CompletionListener {
         return super.onOptionsItemSelected(item)
     }
 
+    /*
+     * completion listener methods
+     */
     override fun onStarted() {
+        //show loading
         progress_circular.show()
     }
 
     override fun onSuccess() {
+        //loading completed - hide loading
         progress_circular.hide()
     }
 
     override fun onFailure(message: String) {
+        //loading failed - hide loading and display toast of error
         progress_circular.hide()
         displayToast(message)
     }

app/src/main/java/com/example/h_mal/candyspace/ui/main/MainViewModel.kt

@@ -3,15 +3,10 @@ package com.example.h_mal.candyspace.ui.main
 import android.content.Context
 import android.view.View
 import android.view.inputmethod.InputMethodManager
-import android.widget.ImageView
-import androidx.core.content.ContextCompat.getSystemService
-import androidx.databinding.BindingAdapter
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
-import com.example.h_mal.candyspace.R
-import com.example.h_mal.candyspace.data.api.User
+import com.example.h_mal.candyspace.data.api.model.User
 import com.example.h_mal.candyspace.data.repositories.Repository
-import com.squareup.picasso.Picasso
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -21,29 +16,39 @@ class MainViewModel(
     private val repository: Repository
 ) : ViewModel() {
 
+    // string binded to the edittext input in @R.layout.main_fragment
     var searchString: String? = null
 
     var completionListener: CompletionListener? = null
 
+    //data objects - live data and var
     val usersLiveData = MutableLiveData<List<User>>()
     var currentUserLiveData: User? = null
 
-    fun submit(view: View){
+    /**
+     * view binding of the submit button in @R.layout.main_fragment
+     */
+    fun submit(view: View?){
+        //close keyboard when clicked
         view.let { v ->
-            val imm = view.context.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
-            imm?.hideSoftInputFromWindow(v.windowToken, 0)
+            val imm = view?.context?.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
+            imm?.hideSoftInputFromWindow(v?.windowToken, 0)
         }
 
         completionListener?.onStarted()
+        //return if search string is empty
         if (searchString.isNullOrEmpty()){
             completionListener?.onFailure("Search box is empty")
             return
         }
 
+        //open a coroutine on the Main thread and update views upon load
         CoroutineScope(Dispatchers.Main).launch {
             try {
+                //retrieve response from API call
                 val apiResponse = repository.getUsers(searchString!!)
 
+                //unwrap list of user out of ApiResponse
                 apiResponse.items?.let {
                     if (it.isNotEmpty()){
                         //update live data

app/src/main/java/com/example/h_mal/candyspace/ui/main/MainViewModelFactory.kt

@@ -4,6 +4,10 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import com.example.h_mal.candyspace.data.repositories.Repository
 
+/**
+ * Viewmodel factory for [MainViewModel]
+ * @repository injected into MainViewModel
+ */
 @Suppress("UNCHECKED_CAST")
 class MainViewModelFactory(
     private val repository: Repository

app/src/main/java/com/example/h_mal/candyspace/ui/user/ListItemViewModel.kt

@@ -1,7 +1,7 @@
-package com.example.h_mal.candyspace.ui.main
+package com.example.h_mal.candyspace.ui.user
 
 import com.example.h_mal.candyspace.R
-import com.example.h_mal.candyspace.data.api.User
+import com.example.h_mal.candyspace.data.api.model.User
 import com.example.h_mal.candyspace.databinding.ListItemLayoutBinding
 import com.xwray.groupie.databinding.BindableItem
 

app/src/main/java/com/example/h_mal/candyspace/ui/user/UserProfileFragment.kt

@@ -1,15 +1,13 @@
-package com.example.h_mal.candyspace.ui.main
+package com.example.h_mal.candyspace.ui.user
 
 import android.os.Bundle
 import android.view.*
 import androidx.fragment.app.Fragment
 import androidx.databinding.DataBindingUtil
-import androidx.lifecycle.Observer
 
 import com.example.h_mal.candyspace.R
 import com.example.h_mal.candyspace.databinding.FragmentUserProfileBinding
-import com.example.h_mal.candyspace.ui.MainActivity
-import com.example.h_mal.candyspace.ui.MainActivity.Companion.viewModel
+import com.example.h_mal.candyspace.ui.main.MainActivity.Companion.viewModel
 import com.squareup.picasso.Picasso
 
 /**
@@ -20,7 +18,8 @@ import com.squareup.picasso.Picasso
 class UserProfileFragment : Fragment() {
 
     companion object {
-        fun newInstance() = UserProfileFragment()
+        fun newInstance() =
+            UserProfileFragment()
     }
 
     lateinit var binding: FragmentUserProfileBinding
@@ -29,13 +28,13 @@ class UserProfileFragment : Fragment() {
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        activity?.actionBar?.setHomeButtonEnabled(true)
-        // Inflate the layout for this fragment
+        // Inflate the layout for this fragment into data binding
         binding = DataBindingUtil.inflate(inflater, R.layout.fragment_user_profile, container, false)
 
         return binding.root
     }
 
+    //Update the data for viewbinding onResume as data would have changed when selecting a new user
     override fun onResume() {
         super.onResume()
         viewModel.currentUserLiveData?.let {

app/src/main/res/layout/fragment_user_profile.xml

@@ -2,14 +2,14 @@
 <layout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    tools:context=".ui.main.UserProfileFragment">
+    tools:context=".ui.user.UserProfileFragment">
 
     <data>
         <import type="com.example.h_mal.candyspace.R"/>
         <import type="com.example.h_mal.candyspace.utils.ConverterUtil"/>
         <variable
             name="user"
-            type="com.example.h_mal.candyspace.data.api.User" />
+            type="com.example.h_mal.candyspace.data.api.model.User" />
     </data>
 
     <androidx.constraintlayout.widget.ConstraintLayout

app/src/main/res/layout/list_item_layout.xml

@@ -6,7 +6,7 @@
     <data>
         <variable
             name="user"
-            type="com.example.h_mal.candyspace.data.api.User" />
+            type="com.example.h_mal.candyspace.data.api.model.User" />
     </data>
 
     <androidx.constraintlayout.widget.ConstraintLayout

app/src/main/res/layout/main_activity.xml

@@ -4,7 +4,7 @@
     android:id="@+id/container"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".ui.MainActivity" >
+    tools:context=".ui.main.MainActivity" >
 
     <ProgressBar
         android:id="@+id/progress_circular"

app/src/main/res/layout/main_fragment.xml

@@ -13,7 +13,7 @@
         android:id="@+id/main"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        tools:context=".ui.main.MainFragment">
+        tools:context=".ui.home.MainFragment">
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

app/src/test/java/com/example/h_mal/candyspace/data/repositories/RepositoryTest.kt

@@ -1,8 +1,7 @@
 package com.example.h_mal.candyspace.data.repositories
 
 import com.example.h_mal.candyspace.data.api.ApiClass
-import com.example.h_mal.candyspace.data.api.ApiResponse
-import com.example.h_mal.candyspace.data.api.User
+import com.example.h_mal.candyspace.data.api.model.ApiResponse
 import kotlinx.coroutines.runBlocking
 import okhttp3.MediaType
 import okhttp3.ResponseBody

app/src/test/java/com/example/h_mal/candyspace/ui/main/MainViewModelTest.kt

@@ -1,12 +1,58 @@
 package com.example.h_mal.candyspace.ui.main
 
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import com.example.h_mal.candyspace.data.api.ApiClass
+import com.example.h_mal.candyspace.data.api.model.ApiResponse
+import com.example.h_mal.candyspace.data.api.model.User
+import com.example.h_mal.candyspace.data.repositories.Repository
+import kotlinx.coroutines.runBlocking
 import org.junit.Before
 
 import org.junit.Assert.*
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TestRule
+import org.mockito.Mock
+import org.mockito.Mockito
+import org.mockito.Mockito.mock
+import org.mockito.MockitoAnnotations
+import retrofit2.Response
+import java.io.IOException
 
 class MainViewModelTest {
 
+    @get:Rule
+    var rule: TestRule = InstantTaskExecutorRule()
+
+    lateinit var viewModel: MainViewModel
+
+    @Mock
+    lateinit var repository: Repository
+
     @Before
     fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        viewModel = MainViewModel(repository)
+    }
+
+    @Test
+    fun getApiFromRepository_SuccessfulReturn() = runBlocking{
+        val user = mock(User::class.java)
+        val mockApiResponse = ApiResponse(listOf(user),null,null,null)
+
+        Mockito.`when`(repository.getUsers("12345")).thenReturn(mockApiResponse)
+
+        viewModel.submit(null)
+
+        assertEquals(mockApiResponse.items, viewModel.usersLiveData.value)
+    }
+
+    @Test
+    fun getApiFromRepository_unsuccessfulReturn() = runBlocking{
+        Mockito.`when`(repository.getUsers("12345")).thenAnswer{ throw IOException() }
+
+        viewModel.submit(null)
+
+        assertEquals(null, viewModel.usersLiveData.value)
     }
 }