Tests: output commands if $DEBUG is set

tests/test.d/simple_test.rb

@@ -249,6 +249,7 @@ class SimpleTest
       command  << " >#{temp_file.path} 2>&1 "
     end
 
+    puts "COMMAND #{command}" if ENV['DEBUG']
     self.error "system command failed: #{command} (#{$? >> 8})" if !system(command) && (options[:exit_code] != ($? >> 8))
 
     return IO.readlines(temp_file.path) if temp_file

tests/test.d/test.rb

@@ -64,6 +64,7 @@ class Test
     @debug_commands << command
     command         << " >/dev/null 2>/dev/null " unless (/>/.match(command))
 
+    puts "COMMAND #{command}" if ENV['DEBUG']
     error "system command failed: #{command} (" + ($? >> 8).to_s + ")" if !system(command) && ((arg.size == 0) || ((arg[0] << 8) != $?))
   end