1 files changed, 61 insertions, 0 deletions
diff --git a/spec/ruby/core/exception/dup_spec.rb b/spec/ruby/core/exception/dup_spec.rb
new file mode 100644
index 0000000000..f5a067ed2f
--- /dev/null
+++ b/spec/ruby/core/exception/dup_spec.rb
@@ -0,0 +1,61 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/common'
+
+describe "Exception#dup" do
+  before :each do
+    @obj = ExceptionSpecs::InitializeException.new("my exception")
+  end
+
+  it "calls #initialize_copy on the new instance" do
+    dup = @obj.dup
+    ScratchPad.recorded.should_not == @obj.object_id
+    ScratchPad.recorded.should == dup.object_id
+  end
+
+  it "copies instance variables" do
+    dup = @obj.dup
+    dup.ivar.should == 1
+  end
+
+  it "does not copy singleton methods" do
+    def @obj.special() :the_one end
+    dup = @obj.dup
+    lambda { dup.special }.should raise_error(NameError)
+  end
+
+  it "does not copy modules included in the singleton class" do
+    class << @obj
+      include ExceptionSpecs::ExceptionModule
+    end
+
+    dup = @obj.dup
+    lambda { dup.repr }.should raise_error(NameError)
+  end
+
+  it "does not copy constants defined in the singleton class" do
+    class << @obj
+      CLONE = :clone
+    end
+
+    dup = @obj.dup
+    lambda { class << dup; CLONE; end }.should raise_error(NameError)
+  end
+
+  it "does copy the message" do
+    @obj.dup.message.should == @obj.message
+  end
+
+  it "does copy the backtrace" do
+    begin
+      # Explicitly raise so a backtrace is associated with the exception.
+      # It's tempting to call `set_backtrace` instead, but that complicates
+      # the test because it might affect other state (e.g., instance variables)
+      # on some implementations.
+      raise ExceptionSpecs::InitializeException.new("my exception")
+    rescue => e
+      @obj = e
+    end
+
+    @obj.dup.backtrace.should == @obj.backtrace
+  end
+end
+\ No newline at end of file