Resolve WES-187 "Unit tests account and system"

Assets/Common/Tests/PlayMode/BackButtonTests.cs

@@ -0,0 +1,39 @@
+using NUnit.Framework;
+using System.Collections;
+using System.IO;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+public class BackButtonTests
+{
+
+    [UnitySetUp]
+    public IEnumerator SetupFunction()
+    {
+        string path = $"{Application.persistentDataPath}/wesign_unit_test.json";
+        string oneUser = $"{{\"version\":{PersistentDataController.VERSION},\"users\":[{{\"entries\":[],\"username\":\"TEST\",\"avatarIndex\":0,\"playtime\":0.0,\"minigames\":[],\"courses\":[]}}],\"currentUser\":0,\"currentMinigame\":0,\"currentCourse\":0,\"currentTheme\":0}}";
+
+        File.WriteAllText(path, oneUser);
+        PersistentDataController.PATH = path;
+        PersistentDataController.GetInstance().Load();
+        AssetDatabase.LoadAssetAtPath<UserAvatarList>("Assets/Accounts/ScriptableObjects/UserAvatarList.asset").Awake();
+        SystemController.GetInstance().LoadNextScene("Common/Scenes/MainMenuScreen");
+        yield return new WaitForSeconds(0.2f);
+        SystemController.GetInstance().LoadNextScene("Common/Scenes/ListMinigamesScreen");
+        yield return new WaitForSeconds(0.2f);
+    }
+
+    [UnityTest]
+    public IEnumerator BackTest()
+    {
+
+        var backButton = (BackButton)GameObject.FindObjectOfType(typeof(BackButton));
+        backButton.Back();
+        yield return new WaitForSeconds(0.2f);
+
+        var mainMenuScreen = (MainMenuScreen)GameObject.FindObjectOfType(typeof(MainMenuScreen));
+        Assert.IsNotNull(mainMenuScreen);
+    }
+}
+