Feature/screeenshot tests

app/build.gradle

@@ -2,6 +2,9 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
+
+apply plugin: 'shot'
+
 apply from: rootProject.file('dependencies.gradle')
 apply from: rootProject.file('versions.gradle')
 apply from: rootProject.file('jacoco.gradle')
@@ -15,13 +18,16 @@ android {
         targetSdkVersion versions.targetSdk
         versionCode versions.code
         versionName versions.name
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+
+        testInstrumentationRunner "com.dvinc.notepad.ScreenshotTestRunner"
+
         vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
         debug {
             minifyEnabled false
-            applicationIdSuffix '.debug'
+            // This line may produce Shot error when he tries download screenshots
+            //applicationIdSuffix '.debug'
             versionNameSuffix '-DEBUG'
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
@@ -53,4 +59,11 @@ dependencies {
     kapt(librariesAnnotaionProcessors)
 
     implementation(appDependencies)
+
+    // Fix for: Generated not found *javax.annotation.processing.Generated*
+    compileOnly 'javax.annotation:jsr250-api:1.0'
+}
+
+shot {
+    appId = 'com.dvinc.notepad'
 }

app/src/androidTest/AndroidManifest.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.dvinc.notepad"
+    android:sharedUserId="com.dvinc.notepad.uid">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+</manifest>

app/src/androidTest/java/com/dvinc/notepad/MainScreenTest.kt

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2020 by Denis Verentsov (decsent@yandex.ru)
+ * All rights reserved.
+ */
+
+package com.dvinc.notepad
+
+import android.content.Context
+import android.util.DisplayMetrics
+import android.view.ContextThemeWrapper
+import android.view.LayoutInflater
+import android.view.View
+import android.view.WindowManager
+import androidx.test.platform.app.InstrumentationRegistry.getInstrumentation
+import androidx.test.rule.ActivityTestRule
+import com.dvinc.notepad.presentation.ui.main.MainActivity
+import com.facebook.testing.screenshot.Screenshot
+import com.facebook.testing.screenshot.ViewHelpers
+import org.junit.Rule
+import org.junit.Test
+
+class MainScreenTest {
+
+    @get:Rule
+    var activityTestRule = ActivityTestRule<MainActivity>(MainActivity::class.java, false, false)
+
+    private val context = getInstrumentation().targetContext
+
+    private val contextWrapper = ContextThemeWrapper(context, R.style.AppTheme)
+
+    private val inflater = LayoutInflater.from(contextWrapper)
+
+    @Test
+    fun testEmptyNotepadList() {
+        val activity = activityTestRule.launchActivity(null)
+
+        Screenshot
+            .snapActivity(activity)
+            .record()
+    }
+
+    @Test
+    fun testEmptyNoteFragment() {
+        val noteFragment = inflater.inflate(R.layout.fragment_note, null, false)
+
+        compareScreenshot(noteFragment)
+    }
+
+    private fun compareScreenshot(view: View) {
+        val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
+        val metrics = DisplayMetrics()
+        windowManager.defaultDisplay.getMetrics(metrics)
+        ViewHelpers.setupView(view)
+            .setExactHeightPx(metrics.heightPixels)
+            .setExactWidthPx(metrics.widthPixels)
+            .layout()
+
+        Screenshot
+            .snap(view)
+            .record()
+    }
+}

app/src/androidTest/java/com/dvinc/notepad/ScreenshotTestRunner.kt

@@ -0,0 +1,18 @@
+package com.dvinc.notepad
+
+import android.os.Bundle
+import androidx.test.runner.AndroidJUnitRunner
+import com.facebook.testing.screenshot.ScreenshotRunner
+
+class ScreenshotTestRunner : AndroidJUnitRunner() {
+
+    override fun onCreate(arguments: Bundle) {
+        ScreenshotRunner.onCreate(this, arguments)
+        super.onCreate(arguments)
+    }
+
+    override fun finish(resultCode: Int, results: Bundle) {
+        ScreenshotRunner.onDestroy()
+        super.finish(resultCode, results)
+    }
+}

app/src/main/AndroidManifest.xml

@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="com.dvinc.notepad">
+    package="com.dvinc.notepad"
+    android:sharedUserId="com.dvinc.notepad.uid">
+<!--    The line above is important for Shot plugin - it must be the same as in Manifest at androidTest folder. -->
 
     <application
         android:name=".NotepadApplication"

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

@@ -64,6 +64,7 @@
             android:layout_marginStart="8dp"
             android:layout_marginEnd="8dp"
             android:layout_marginBottom="8dp"
+            android:background="@color/black"
             android:textColor="@android:color/white"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"

build.gradle

@@ -3,6 +3,7 @@ buildscript {
     ext.kotlin_version = '1.3.60'
     ext.detekt_version = '1.0.0-RC14'
     ext.spotless_version = '3.27.1'
+    ext.shot_version = '3.1.0'
 
     repositories {
         google()
@@ -16,6 +17,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "io.gitlab.arturbosch.detekt:detekt-gradle-plugin:$detekt_version"
         classpath "com.diffplug.spotless:spotless-plugin-gradle:$spotless_version"
+        classpath "com.karumi:shot:$shot_version"
     }
 }
 

dependencies.gradle

@@ -13,6 +13,7 @@ def junit_version = '4.12'
 def mockito_core_version = '2.18.0'
 def kotlin_mockito_version = '2.1.0'
 def android_arch_core_testing_version = '2.0.1'
+def test_rules_version = '1.2.0'
 
 def stetho_version = '1.5.0'
 def timber_version = '4.7.1'
@@ -73,6 +74,10 @@ ext{
     androidTestDependencies = [
             test_runner =  "com.android.support.test:runner:$test_runner_version",
 
-            espresso_core =  "com.android.support.test.espresso:espresso-core:$espresso_core_version"
+            espresso_core =  "com.android.support.test.espresso:espresso-core:$espresso_core_version",
+
+            test_rules =  "androidx.test:rules:$test_rules_version",
+
+            kotlin_mockito = "com.nhaarman.mockitokotlin2:mockito-kotlin:$kotlin_mockito_version"
     ]
 }