GenerateDefaultInstall tests, for KSP-CKAN#127.

Seriously folks, write more tests, they're awesome.

ModuleInstaller.cs

@@ -448,7 +448,7 @@ private string Sha1Sum(string path)
         /// Returns a default install stanza for the module provided. This finds the topmost
         /// directory which matches the module identifier, and installs that into GameData.
         /// </summary>
-        internal ModuleInstallDescriptor GenerateDefaultInstall(CkanModule module, ZipFile zipfile)
+        internal static ModuleInstallDescriptor GenerateDefaultInstall(string identifier, ZipFile zipfile)
         {
             var stanza = new ModuleInstallDescriptor();
             stanza.description = "Default install (autogenerated)";
@@ -462,15 +462,15 @@ internal ModuleInstallDescriptor GenerateDefaultInstall(CkanModule module, ZipFi
             // don't include entries for directories, but still include entries
             // for the files they contain.
 
-            string ident_filter = @"(^|/|\\)" + Regex.Escape(module.identifier) + @"$";
+            string ident_filter = @"(^|/|\\)" + Regex.Escape(identifier) + @"$";
 
             // Let's find that directory
             foreach (ZipEntry entry in zipfile)
             {
                 string directory = Path.GetDirectoryName(entry.Name);
 
                 // If this looks like what we're after, remember it.
-                if (Regex.IsMatch(directory, ident_filter))
+                if (Regex.IsMatch(directory, ident_filter, RegexOptions.IgnoreCase ))
                 {
                     candidate_set.Add(directory);
                 }

Properties/AssemblyInfo.cs

@@ -24,4 +24,7 @@
 //[assembly: AssemblyDelaySign(false)]
 //[assembly: AssemblyKeyFile("")]
 
+// Tests can see our internals.
+[assembly: InternalsVisibleTo("Tests")]
+
 // NB: The CKAN build/release process appends an AssemblyInformationalVersion to this file.