Add comprehensive test suite, fix minor issues, rename function and file names to match approved verbs (#708)

Tests/TestData/JsonFileLoading/Config.Invalid.json

@@ -0,0 +1,4 @@
+{
+  "Version": "1.0",
+  "Name":
+}

Tests/TestData/JsonFileLoading/Config.Valid.json

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+{
+  "Version": "1.0",
+  "Name": "Example configuration"
+}

Tests/TestData/JsonFileLoading/Config.VersionMismatch.json

@@ -0,0 +1,4 @@
+{
+  "Version": "2.0",
+  "Name": "Incompatible configuration"
+}

Tests/TestData/JsonFileLoading/DefaultSettings.MissingSettings.json

@@ -0,0 +1,3 @@
+{
+  "Version": "1.0"
+}

Tests/TestData/JsonFileLoading/DefaultSettings.Valid.json

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+{
+  "Version": "1.0",
+  "Settings": [
+    { "Name": "Supported", "Value": "configured" },
+    { "Name": "Supported", "Value": false },
+    { "Name": "Unknown", "Value": true },
+    { "Name": "TooNew", "Value": true },
+    { "Name": "DisableModernStandbyNetworking", "Value": true }
+  ]
+}

Tests/TestData/JsonFileLoading/ExportedConfig.WithSettings.json

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+{
+  "Version": "1.0",
+  "Deployment": [
+    { "Name": "UserSelectionIndex", "Value": 0 },
+    { "Name": "AppRemovalScopeIndex", "Value": 0 },
+    { "Name": "CreateRestorePoint", "Value": true },
+    { "Name": "RestartExplorer", "Value": false }
+  ],
+  "Tweaks": [
+    { "Name": "DisableSettings365Ads", "Value": true },
+    { "Name": "DisableSnapAssist", "Value": true },
+    { "Name": "EnableDarkMode", "Value": true },
+    { "Name": "ShowSearchBoxTb", "Value": true },
+    { "Name": "DisableTelemetry", "Value": true },
+    { "Name": "DisableWidgets", "Value": true },
+    { "Name": "DisableLockscreenTips", "Value": true },
+    { "Name": "DisableSnapLayouts", "Value": true },
+    { "Name": "DisableAISvcAutoStart", "Value": true },
+    { "Name": "DisableMouseAcceleration", "Value": true },
+    { "Name": "DisableCopilot", "Value": true },
+    { "Name": "DisableRecall", "Value": true }
+  ]
+}

Tests/TestData/JsonFileLoading/LastUsedSettings.Invalid.json

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+{
+  "Version": "1.0",
+  "Settings": [
+    { "Name": "Supported", "Value": true }
+
+}

Tests/TestData/JsonFileLoading/LastUsedSettings.Valid.json

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+{
+  "Version": "1.0",
+  "Settings": [
+    { "Name": "Supported", "Value": true }
+  ]
+}

Tests/TestData/JsonFileLoading/RegistryBackup.Invalid.json

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+{
+  "Version": "1.0",
+  "BackupType":
+}

Tests/TestData/JsonFileLoading/RegistryBackup.RealStructure.json

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+{
+  "RegistryKeys": [
+    {
+      "SubKeys": [],
+      "Path": "HKEY_CURRENT_USER\\Control Panel\\Accessibility\\StickyKeys",
+      "Values": [
+        {
+          "Kind": "String",
+          "Name": "Flags",
+          "Data": "510",
+          "Exists": true
+        }
+      ],
+      "Exists": true
+    },
+    {
+      "SubKeys": [],
+      "Path": "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
+      "Values": [
+        {
+          "Kind": "DWord",
+          "Name": "EnableTransparency",
+          "Data": 0,
+          "Exists": true
+        }
+      ],
+      "Exists": true
+    }
+  ],
+  "ComputerName": "TEST-COMPUTER",
+  "BackupType": "RegistryState",
+  "SelectedUndoFeatures": [
+    "DisableTransparency"
+  ],
+  "CreatedBy": "Win11Debloat",
+  "Version": "1.0",
+  "Target": "CurrentUser:fixture-user",
+  "SelectedFeatures": [
+    "RemoveApps",
+    "DisableStickyKeys"
+  ],
+  "CreatedAt": "2026-07-11T20:00:33.9825666+02:00"
+}

Tests/TestData/JsonFileLoading/RegistryBackup.Valid.json

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+{
+  "Version": "1.0",
+  "BackupType": "RegistryState",
+  "Target": "DefaultUserProfile",
+  "SelectedFeatures": [],
+  "RegistryKeys": []
+}