Tests: Add the ServiceDescriptorAssert class.

The class provides basic logic for analyzing parameters

src/Test/winswTests/Util/ServiceDescriptorAssert.cs

@@ -0,0 +1,67 @@
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+using winsw;
+using winsw.Configuration;
+
+namespace winswTests.Util
+{
+    public static class ServiceDescriptorAssert
+    {
+        // TODO: convert to Extension attributes once the .NET dependency is upgraded
+        // BTW there is a way to get them working in .NET2, but KISS
+
+        public static void AssertPropertyIsDefault(ServiceDescriptor d, string property) 
+        {
+            PropertyInfo actualProperty = typeof(ServiceDescriptor).GetProperty(property);
+            Assert.IsNotNull(actualProperty, "Cannot find property " + property + " in the service descriptor" + d);
+            PropertyInfo defaultProperty = typeof(DefaultWinSWSettings).GetProperty(property);
+            Assert.IsNotNull(defaultProperty, "Cannot find property " + property + " in the default settings");
+
+            Assert.AreEqual(defaultProperty.GetValue(ServiceDescriptor.Defaults, null), actualProperty.GetValue(d, null),
+                "Value of property " + property + " does not equal to the default one");
+        }
+
+        public static void AssertPropertyIsDefault(ServiceDescriptor d, List<string> properties)
+        {
+            foreach (var prop in properties)
+            {
+                AssertPropertyIsDefault(d, prop);
+            }
+        }
+
+        public static void AssertAllOptionalPropertiesAreDefault(ServiceDescriptor d)
+        {
+            AssertPropertyIsDefault(d, AllOptionalProperties);
+        }
+
+        private static List<string> AllProperties {
+            get {
+                var res = new List<string>();
+                var properties = typeof(IWinSWConfiguration).GetProperties();
+                foreach (var prop in properties)
+                {
+                    res.Add(prop.Name);
+                }
+                return res;
+            }
+        }
+
+        private static List<string> AllOptionalProperties
+        {
+            get
+            {
+                var properties = AllProperties;
+                properties.Remove("Id");
+                properties.Remove("Caption");
+                properties.Remove("Description");
+                properties.Remove("Executable");
+                return properties;
+            }
+        }
+    }
+
+    
+}

src/Test/winswTests/winswTests.csproj

@@ -62,6 +62,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ServiceDescriptorTests.cs" />
     <Compile Include="Util\CLITestHelper.cs" />
+    <Compile Include="Util\ServiceDescriptorAssert.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Core\ServiceWrapper\winsw.csproj">