Тесты красной зоны

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/ElementExistsException.cs

@@ -0,0 +1,13 @@
+
+namespace SmallSoftwareContracts.Exceptions;
+public class ElementExistsException : Exception
+{
+    public string ParamName { get; private set; }
+    public string ParamValue { get; private set; }
+    public ElementExistsException(string paramName, string paramValue) :
+    base($"There is already an element with value{paramValue} of parameter { paramName}")
+    {
+        ParamName = paramName;
+        ParamValue = paramValue;
+    }
+}