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-rw-r--r--spec/ruby/core/string/dup_spec.rb52
1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/core/string/dup_spec.rb b/spec/ruby/core/string/dup_spec.rb
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+++ b/spec/ruby/core/string/dup_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "String#dup" do
+ before :each do
+ ScratchPad.clear
+ @obj = StringSpecs::InitializeString.new "string"
+ 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 StringSpecs::StringModule
+ 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 not modify the original string when changing dupped string" do
+ orig = "string"[0..100]
+ dup = orig.dup
+ orig[0] = 'x'
+ orig.should == "xtring"
+ dup.should == "string"
+ end
+end