Fix rake failure since `mrbtest_objs` isn't flattened.

Append generated test object to `@test_objs` of mrbgem spec.
Add method `custom_test_init?` to check whether mrbgem has custom test init function.

1 files changed, 5 insertions, 0 deletions

diff --git a/tasks/mrbgem_spec.rake b/tasks/mrbgem_spec.rake
index 9e461d42b..745b2f29d 100644
--- a/tasks/mrbgem_spec.rake
+++ b/tasks/mrbgem_spec.rake
@@ -62,6 +62,7 @@ module MRuby
         @test_objs = Dir.glob("#{dir}/test/*.{c,cpp,cxx,cc,m,asm,s,S}").map do |f|
           objfile(f.relative_path_from(dir).to_s.pathmap("#{build_dir}/%X"))
         end
+        @custom_test_init = !@test_objs.empty?
         @test_preload = nil # 'test/assert.rb'
         @test_args = {}
 
@@ -189,6 +190,10 @@ module MRuby
         [@name]
       end
 
+      def custom_test_init?
+        @custom_test_init
+      end
+
       def version_ok?(req_versions)
         req_versions.map do |req|
           cmp, ver = req.split