Add unit tests for incorrect settings json files (#7644)

* added some test config files

* Added tests for each powertoy to ensure that they don't crash even when there is a corrupt json

* Revert "Added tests for each powertoy to ensure that they don't crash even when there is a corrupt json"

This reverts commit fe3ed40.

* Revert "added some test config files"

This reverts commit d089284.

* add a settings utils to test that a default item is returned when the json file is corrupt

src/core/Microsoft.PowerToys.Settings.UI.UnitTests/ModelsTests/SettingsUtilsTests.cs

@@ -7,7 +7,9 @@
 using System.Linq;
 using System.Text.Json;
 using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.Library.Interfaces;
 using Microsoft.PowerToys.Settings.UI.Library.Utilities;
+using Microsoft.PowerToys.Settings.UI.UnitTests.BackwardsCompatibility;
 using Microsoft.PowerToys.Settings.UI.UnitTests.Mocks;
 using Microsoft.PowerToys.Settings.UnitTest;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
@@ -19,7 +21,6 @@ namespace CommonLibTest
     public class SettingsUtilsTests
     {
 
-
         [TestMethod]
         public void SaveSettingsSaveSettingsToFileWhenFilePathExists()
         {
@@ -79,6 +80,21 @@ public void SettingsFolderExistsShouldReturnFalseWhenFilePathIsNotFound()
             Assert.IsTrue(pathFound);
         }
 
+        [TestMethod]
+        public void SettingsUtilsMustReturnDefaultItemWhenFileIsCorrupt()
+        {
+            // Arrange
+            var mockIOProvider = BackCompatTestProperties.GetModuleIOProvider("CorruptJson", string.Empty, "settings.json");
+            var mockSettingsUtils = new SettingsUtils(mockIOProvider.Object);
+
+            // Act
+            TestClass settings = mockSettingsUtils.GetSettings<TestClass>(string.Empty);
+
+            // Assert
+            Assert.AreEqual(settings.TestInt, 100);
+            Assert.AreEqual(settings.TestString, "test");
+        }
+
         public static string RandomString()
         {
             Random random = new Random();
@@ -88,5 +104,26 @@ public static string RandomString()
             return new string(Enumerable.Repeat(chars, length)
               .Select(s => s[random.Next(s.Length)]).ToArray());
         }
+
+        partial class TestClass : ISettingsConfig
+        {
+            public int TestInt { get; set; } = 100;
+            public string TestString { get; set; } = "test";
+
+            public string GetModuleName()
+            {
+                throw new NotImplementedException();
+            }
+
+            public string ToJsonString()
+            {
+                return JsonSerializer.Serialize(this);
+            }
+
+            public bool UpgradeSettingsConfiguration()
+            {
+                throw new NotImplementedException();
+            }
+        }
     }
 }