reduce mrb_open calls in mrbgem test

mrbgems/mruby-random/test/random.rb

@@ -73,4 +73,4 @@ assert('Array#shuffle!(random)') do
   ary2.shuffle! Random.new 345
   
   ary1 != [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] and 10.times { |x| ary1.include? x } and ary1 == ary2
-end
\ No newline at end of file
+end

tasks/mrbgem_spec.rake

@@ -43,6 +43,10 @@ module MRuby
         MRuby::Gem.current = self
       end
 
+      def run_test_in_other_mrb_state?
+        not test_preload.nil? or not test_objs.empty?
+      end
+
       def cxx_abi_enabled?
         @cxx_abi_enabled
       end

tasks/mrbgems_test.rake

 MRuby.each_target do
+  no_mrb_open_test_gem = []
+
   gems.each do |g|
+    unless g.run_test_in_other_mrb_state?
+      no_mrb_open_test_gem << g
+      next
+    end
+
     test_rbobj = g.test_rbireps.ext(exts.object)
 
     file test_rbobj => g.test_rbireps
@@ -100,4 +107,37 @@ MRuby.each_target do
     end
 
   end
+
+  no_mrb_open_test = "#{build_dir}/test/no_mrb_open_test"
+  no_mrb_open_test_rbfiles = no_mrb_open_test_gem.reduce([]) { |res, v|
+    res += v.test_rbfiles
+  }
+  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|
+      f.puts %Q[/*]
+      f.puts %Q[ * This file contains a test code for following gems:]
+      no_mrb_open_test_gem.each { |g| f.puts %Q[ *   #{g.name}] }
+      f.puts %Q[ *]
+      f.puts %Q[ * IMPORTANT:]
+      f.puts %Q[ *   This file was generated!]
+      f.puts %Q[ *   All manual changes will get lost.]
+      f.puts %Q[ */]
+
+      f.puts %Q[]
+
+      f.puts %Q[\#include "mruby.h"]
+      f.puts %Q[\#include "mruby/irep.h"]
+
+      f.puts %Q[]
+
+      mrbc.run f, no_mrb_open_test_rbfiles, "no_mrb_open_gem_test_irep"
+
+      f.puts %Q[]
+
+      f.puts %Q[void no_mrb_open_mrbgem_test(mrb_state *mrb) {]
+      f.puts %Q[  mrb_load_irep(mrb, no_mrb_open_gem_test_irep);]
+      f.puts %Q[}]
+    end
+  end
 end

test/mrbtest.rake

@@ -12,9 +12,11 @@ MRuby.each_target do
   ass_lib = ass_c.ext(exts.object)
 
   mrbtest_lib = libfile("#{current_build_dir}/mrbtest")
-  file mrbtest_lib => [mlib, ass_lib, gems.map(&:test_objs), gems.map { |g| g.test_rbireps.ext(exts.object) }].flatten do |t|
+  gem_test_files = gems.select { |g| g.run_test_in_other_mrb_state? }.map { |g| g.test_rbireps.ext(exts.object) }
+  file mrbtest_lib => [mlib, ass_lib, gems.map(&:test_objs), gem_test_files].flatten do |t|
     archiver.run t.name, t.prerequisites
   end
+  file mrbtest_lib => "#{build_dir}/test/no_mrb_open_test.o"
 
   unless build_mrbtest_lib_only?
     driver_obj = objfile("#{current_build_dir}/driver")
@@ -53,12 +55,16 @@ MRuby.each_target do
       f.puts IO.read(init)
       mrbc.run f, mrbs, 'mrbtest_irep'
       gems.each do |g|
+        next unless g.run_test_in_other_mrb_state?
         f.puts %Q[void GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb_state *mrb);]
       end
+      f.puts %Q[void no_mrb_open_mrbgem_test(mrb_state *mrb);]
       f.puts %Q[void mrbgemtest_init(mrb_state* mrb) {]
       gems.each do |g|
+        next unless g.run_test_in_other_mrb_state?
         f.puts %Q[    GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb);]
       end
+      f.puts %Q[    no_mrb_open_mrbgem_test(mrb);]
       f.puts %Q[}]
     end
   end