Easier removal of temporary files for test classes. Added a new exception for handling inside the test classes themselves so that they do not have to use RuntimeError which is used extensively by the Test class itself.

tests/run.rb

@@ -1,5 +1,8 @@
 #!/usr/bin/ruby
 
+class SubtestError < RuntimeError
+end
+
 class Test
   attr_reader :commands
   attr_reader :debug_commands
@@ -18,14 +21,18 @@ class Test
     return error("Trying to run the base class")
   end
 
-  def run_test
-    begin
-      return run
-    rescue RuntimeError => ex
+  def unlink_tmp_files
     n = "mkvtoolnix-auto-test-" + $$.to_s + "-"
     Dir.entries("/tmp").each do |e|
       File.unlink("/tmp/#{e}") if (e =~ /^#{n}/)
     end
+  end
+
+  def run_test
+    begin
+      return run
+    rescue RuntimeError => ex
+      unlink_tmp_files
       puts(ex.to_s)
       return nil
     end