1 files changed, 51 insertions, 6 deletions
diff --git a/spec/ruby/optional/capi/gc_spec.rb b/spec/ruby/optional/capi/gc_spec.rb
index 23e2b7c9ab..aaced56483 100644
--- a/spec/ruby/optional/capi/gc_spec.rb
+++ b/spec/ruby/optional/capi/gc_spec.rb
@@ -7,15 +7,60 @@ describe "CApiGCSpecs" do
     @f = CApiGCSpecs.new
   end
 
-  it "correctly gets the value from a registered address" do
-    @f.registered_tagged_address.should == 10
-    @f.registered_tagged_address.should equal(@f.registered_tagged_address)
-    @f.registered_reference_address.should == "Globally registered data"
-    @f.registered_reference_address.should equal(@f.registered_reference_address)
+  describe "rb_gc_register_address" do
+    it "correctly gets the value from a registered address" do
+      @f.registered_tagged_address.should == 10
+      @f.registered_tagged_address.should equal(@f.registered_tagged_address)
+      @f.registered_reference_address.should == "Globally registered data"
+      @f.registered_reference_address.should equal(@f.registered_reference_address)
+    end
+
+    it "keeps the value alive even if the value is assigned after rb_gc_register_address() is called" do
+      GC.start
+      @f.registered_before_rb_gc_register_address.should == "registered before rb_gc_register_address()"
+    end
+
+    it "can be called outside Init_" do
+      @f.rb_gc_register_address.should == "rb_gc_register_address() outside Init_"
+      @f.rb_gc_unregister_address
+    end
   end
 
-  describe "rb_gc_enable" do
+  describe "rb_global_variable" do
+    before :all do
+      GC.start
+    end
+
+    describe "keeps the value alive even if the value is assigned after rb_global_variable() is called" do
+      it "for a string" do
+        @f.registered_before_rb_global_variable_string.should == "registered before rb_global_variable()"
+      end
+
+      it "for a bignum" do
+        @f.registered_before_rb_global_variable_bignum.should == 2**63 - 1
+      end
 
+      it "for a Float" do
+        @f.registered_before_rb_global_variable_float.should == 3.14
+      end
+    end
+
+    describe "keeps the value alive when the value is assigned before rb_global_variable() is called" do
+      it "for a string" do
+        @f.registered_after_rb_global_variable_string.should == "registered after rb_global_variable()"
+      end
+
+      it "for a bignum" do
+        @f.registered_after_rb_global_variable_bignum.should == 2**63 - 1
+      end
+
+      it "for a Float" do
+        @f.registered_after_rb_global_variable_float.should == 6.28
+      end
+    end
+  end
+
+  describe "rb_gc_enable" do
     after do
       GC.enable
     end