1 files changed, 27 insertions, 0 deletions
diff --git a/spec/rubyspec/optional/capi/range_spec.rb b/spec/rubyspec/optional/capi/range_spec.rb
index b145079f39..aa16f9773e 100644
--- a/spec/rubyspec/optional/capi/range_spec.rb
+++ b/spec/rubyspec/optional/capi/range_spec.rb
@@ -65,4 +65,31 @@ describe "C-API Range function" do
       excl.should be_false
     end
   end
+
+  describe "rb_range_beg_len" do
+    it "returns correct begin, length and result" do
+      r = 2..5
+      begp, lenp, result = @s.rb_range_beg_len(r, 0, 0, 10, 0)
+      result.should be_true
+      begp.should == 2
+      lenp.should == 4
+    end
+
+    it "returns nil when not in range" do
+      r = 2..5
+      begp, lenp, result = @s.rb_range_beg_len(r, 0, 0, 1, 0)
+      result.should be_nil
+    end
+
+    it "raises a RangeError when not in range and err is 1" do
+      r = -5..-1
+      lambda { @s.rb_range_beg_len(r, 0, 0, 1, 1) }.should raise_error(RangeError)
+    end
+
+    it "returns nil when not in range and err is 0" do
+      r = -5..-1
+      begp, lenp, result =  @s.rb_range_beg_len(r, 0, 0, 1, 0)
+      result.should be_nil
+    end
+  end
 end