1 files changed, 29 insertions, 11 deletions
diff --git a/spec/ruby/optional/capi/gc_spec.rb b/spec/ruby/optional/capi/gc_spec.rb
index d9661328ab..8b70ea4758 100644
--- a/spec/ruby/optional/capi/gc_spec.rb
+++ b/spec/ruby/optional/capi/gc_spec.rb
@@ -7,12 +7,30 @@ describe "CApiGCSpecs" do
     @f = CApiGCSpecs.new
   end
 
+  describe "RB_GC_GUARD" do
+    it "forces an object to on stack so it cannot be GC'd early" do
+      @f.RB_GC_GUARD_keep_alive([%w[ab cd ef].join]).should == "abc"
+    end
+
+    it "can be used with any Ruby object" do
+      @f.RB_GC_GUARD(true).should == true
+      @f.RB_GC_GUARD(42).should == 42
+      @f.RB_GC_GUARD(self).should == self
+    end
+
+    it "tolerates being passed invalid pointers" do
+      (0...256).each do |address|
+        @f.RB_GC_GUARD_raw(address).should == nil
+      end
+    end
+  end
+
   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_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)
+      @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
@@ -67,22 +85,22 @@ describe "CApiGCSpecs" do
 
     it "enables GC when disabled" do
       GC.disable
-      @f.rb_gc_enable.should be_true
+      @f.rb_gc_enable.should == true
     end
 
     it "GC stays enabled when enabled" do
       GC.enable
-      @f.rb_gc_enable.should be_false
+      @f.rb_gc_enable.should == false
     end
 
     it "disables GC when enabled" do
       GC.enable
-      @f.rb_gc_disable.should be_false
+      @f.rb_gc_disable.should == false
     end
 
     it "GC stays disabled when disabled" do
       GC.disable
-      @f.rb_gc_disable.should be_true
+      @f.rb_gc_disable.should == true
     end
   end
 
@@ -100,13 +118,13 @@ describe "CApiGCSpecs" do
       -> {
         @f.rb_gc_adjust_memory_usage(8)
         @f.rb_gc_adjust_memory_usage(-8)
-      }.should_not raise_error
+      }.should_not.raise
     end
   end
 
   describe "rb_gc_register_mark_object" do
     it "can be called with an object" do
-      @f.rb_gc_register_mark_object(Object.new).should be_nil
+      @f.rb_gc_register_mark_object(Object.new).should == nil
     end
 
     it "keeps the value alive even if the value is not referenced by any Ruby object" do
@@ -116,11 +134,11 @@ describe "CApiGCSpecs" do
 
   describe "rb_gc_latest_gc_info" do
     it "raises a TypeError when hash or symbol not given" do
-      -> { @f.rb_gc_latest_gc_info("foo") }.should raise_error(TypeError)
+      -> { @f.rb_gc_latest_gc_info("foo") }.should.raise(TypeError)
     end
 
     it "raises an ArgumentError when unknown symbol given" do
-      -> { @f.rb_gc_latest_gc_info(:unknown) }.should raise_error(ArgumentError)
+      -> { @f.rb_gc_latest_gc_info(:unknown) }.should.raise(ArgumentError)
     end
 
     it "returns the populated hash when a hash is given" do
@@ -130,7 +148,7 @@ describe "CApiGCSpecs" do
     end
 
     it "returns a value when symbol is given" do
-      @f.rb_gc_latest_gc_info(:state).should be_kind_of(Symbol)
+      @f.rb_gc_latest_gc_info(:state).should.is_a?(Symbol)
     end
   end
 end