Spec that struct-class duping produces identical method tables.

This could be expanded into a full set of dup/clone specs, or the Class#dup/clone specs could be expanded to also test other types of "weird" classes like structs and prepends. For #3686
jruby · Apr 28, 2016 · a4323b3 · a4323b3
1 parent 74d5312
commit a4323b3
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/spec/ruby/core/struct/dup_spec.rb b/spec/ruby/core/struct/dup_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Struct-based class#dup" do
+
+  # From https://github.com/jruby/jruby/issues/3686
+  it "retains an included module in the ancestor chain for the struct's singleton class" do
+    klass = Struct.new(:foo)
+    mod = Module.new do
+      def hello
+        "hello"
+      end
+    end
+
+    klass.extend(mod)
+    klass_dup = klass.dup
+    klass_dup.hello.should == "hello"
+  end
+
+end