1 files changed, 40 insertions, 0 deletions
diff --git a/spec/ruby/library/openstruct/frozen_spec.rb b/spec/ruby/library/openstruct/frozen_spec.rb
new file mode 100644
index 0000000000..c37fd18c8c
--- /dev/null
+++ b/spec/ruby/library/openstruct/frozen_spec.rb
@@ -0,0 +1,40 @@
+require_relative '../../spec_helper'
+require 'ostruct'
+
+describe "OpenStruct.new when frozen" do
+  before :each do
+    @os = OpenStruct.new(name: "John Smith", age: 70, pension: 300).freeze
+  end
+  #
+  # method_missing case handled in method_missing_spec.rb
+  #
+  it "is still readable" do
+    @os.age.should.eql?(70)
+    @os.pension.should.eql?(300)
+    @os.name.should == "John Smith"
+  end
+
+  it "is not writable" do
+    ->{ @os.age = 42 }.should.raise( RuntimeError )
+  end
+
+  it "cannot create new fields" do
+    ->{ @os.state = :new }.should.raise( RuntimeError )
+  end
+
+  it "creates a frozen clone" do
+    f = @os.clone
+    f.frozen?.should == true
+    f.age.should == 70
+    ->{ f.age = 0 }.should.raise( RuntimeError )
+    ->{ f.state = :newer }.should.raise( RuntimeError )
+  end
+
+  it "creates an unfrozen dup" do
+    d = @os.dup
+    d.frozen?.should == false
+    d.age.should == 70
+    d.age = 42
+    d.age.should == 42
+  end
+end