Fix build fail for 'make test' with no mrbgems

2 files changed, 6 insertions, 0 deletions

diff --git a/tasks/mrbgems_test.rake b/tasks/mrbgems_test.rake
index 4c27686f2..b29a57f3d 100644
--- a/tasks/mrbgems_test.rake
+++ b/tasks/mrbgems_test.rake
@@ -111,6 +111,10 @@ MRuby.each_target do
   no_mrb_open_test_rbfiles = no_mrb_open_test_gem.reduce([]) { |res, v|
     res += v.test_rbfiles
   }
+  if no_mrb_open_test_rbfiles.empty?
+    no_mrb_open_test_rbfiles << "#{MRUBY_ROOT}/test/no_mrb_open_test_dummy.rb"
+  end
+  
   file "#{no_mrb_open_test}.o" => "#{no_mrb_open_test}.c"
   file "#{no_mrb_open_test}.c" => no_mrb_open_test_rbfiles do |t|
     open(t.name, 'w') do |f|
diff --git a/test/no_mrb_open_test_dummy.rb b/test/no_mrb_open_test_dummy.rb
new file mode 100644
index 000000000..5181c0a45
--- /dev/null
+++ b/test/no_mrb_open_test_dummy.rb
@@ -0,0 +1,2 @@
+#dummy
+