Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/XmlAdapter.cs
===================================================================
diff -u -r5397 -r5426
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/XmlAdapter.cs	(.../XmlAdapter.cs)	(revision 5397)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/XmlAdapter.cs	(.../XmlAdapter.cs)	(revision 5426)
@@ -21,30 +21,36 @@
 
 using System.Linq;
 using System.Text.RegularExpressions;
+using Deltares.DamEngine.Io.XmlInput;
 
 namespace Deltares.DamEngine.TestHelpers;
 
 /// <summary>
 /// Helper class for adapting xml in tests
 /// </summary>
-public class XmlAdapter
+public static class XmlAdapter
 {
     /// <summary>
     /// Changes in an XML the value of all elements with the specified key to the specified value.
     /// </summary>
     /// <param name="input">The input.</param>
     /// <param name="key">The key.</param>
     /// <param name="value">The value.</param>
-    /// <returns></returns>
+    /// <returns>The modified input</returns>
     public static string ChangeValueInXml(string input, string key, string value)
     {
-        string result = input;
         string searchString = key + "=" + "\"([^\"]*)\""; // This means match any pattern which matches <key>="<StringWithAnyCharacterExceptQuote>"
         string replacement = key + "=\"" + value + "\""; // Replace with <key>="<value>"
-        result = Regex.Replace(input, searchString, replacement, RegexOptions.IgnorePatternWhitespace);
+        string result = Regex.Replace(input, searchString, replacement, RegexOptions.IgnorePatternWhitespace);
         return result;
     }
-
+    
+    /// <summary>
+    /// Selects locations from an XML based on the location names by removing the other locations.
+    /// </summary>
+    /// <param name="input">The input.</param>
+    /// <param name="locationNames">The names of the locations that need to be selected.</param>
+    /// <returns>The modified input</returns>
     public static string SelectLocations(string input, string[] locationNames)
     {
         string result = input;
@@ -61,4 +67,58 @@
         return result;
     }
 
+    /// <summary>
+    /// Changes the stability input model.
+    /// </summary>
+    /// <param name="input">The input.</param>
+    /// <param name="stabilityModelType">The stability input model</param>
+    /// <returns>The modified input</returns>
+    public static string ChangeStabilityInputModel(string input, InputStabilityModelType stabilityModelType)
+    {
+        const string pattern = "StabilityModelType=\"[a-zA-Z]+\"";
+        string replacement = stabilityModelType switch
+        {
+            InputStabilityModelType.Bishop => "StabilityModelType=\"Bishop\"",
+            InputStabilityModelType.UpliftVan => "StabilityModelType=\"UpliftVan\"",
+            InputStabilityModelType.BishopUpliftVan => "StabilityModelType=\"BishopUpliftVan\"",
+            _ => pattern
+        };
+        string result = Regex.Replace(input, pattern, replacement);
+        return result;
+    }
+    
+    /// <summary>
+    /// Changes the piping input model.
+    /// </summary>
+    /// <param name="input">The input.</param>
+    /// <param name="pipingModelType">The piping input model</param>
+    /// <returns>The modified input</returns>
+    public static string ChangePipingInputModel(string input, InputPipingModelType pipingModelType)
+    {
+        const string pattern = "PipingModelType=\"[a-zA-Z]+\"";
+        string replacement = pipingModelType switch
+        {
+            InputPipingModelType.Bligh => "PipingModelType=\"Bligh\"",
+            InputPipingModelType.WtiSellmeijerRevised => "PipingModelType=\"WtiSellmeijerRevised\"",
+            InputPipingModelType.Sellmeijer4Forces => "PipingModelType=\"Sellmeijer4Forces\"",
+            InputPipingModelType.SellmeijerVnk => "PipingModelType=\"SellmeijerVnk\"",
+            _ => pattern
+        };
+        string result = Regex.Replace(input, pattern, replacement);
+        return result;
+    }
+
+    /// <summary>
+    /// Changes the stability model type to piping model type.
+    /// </summary>
+    /// <param name="input">The input.</param>
+    /// <returns>The modified input</returns>
+    public static string ChangeStabilityToPiping(string input)
+    {
+        const string pattern = "StabilityModelType=";
+        const string replacement = "PipingModelType=";
+        string result = Regex.Replace(input, pattern, replacement);
+        return result;
+    }
+    
 }
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