Merge pull request #75 from Richard-Degenne/fix/ruby-3.1-freeze

Fix Ruby 3.1 #freeze

lib/recursive_open_struct.rb

@@ -137,6 +137,14 @@ def method_missing(mid, *args)
     end
   end
 
+  def freeze
+    @table.each_key do |key|
+      new_ostruct_member!(key)
+    end
+
+    super
+  end
+
   # TODO: Rename to new_ostruct_member! once we care less about Rubies before
   # 2.4.0.
   def new_ostruct_member(name)

spec/recursive_open_struct/open_struct_behavior_spec.rb

@@ -108,5 +108,41 @@
         it { expect(subject.methods.map(&:to_sym)).to_not include :asdf= }
       end # describe #methods
     end # describe handling of arbitrary attributes
+
+    describe "handling of freezing" do
+      let(:hash) { { :asdf => 'John Smith' } }
+
+      before do
+        ros.freeze
+      end
+
+      it "can read existing keys" do
+        expect(ros.asdf).to eq 'John Smith'
+      end
+
+      it "cannot write new keys" do
+        expect { ros.new_key = 'new_value' }.to raise_error FrozenError
+      end
+
+      it "cannot write existing keys" do
+        expect { ros.asdf = 'new_value' }.to raise_error FrozenError
+      end
+
+      context "with recursive structure" do
+        let(:hash) { { :key => { :subkey => 42 } } }
+
+        it "can read existing sub-elements" do
+          expect(ros.key.subkey).to eq 42
+        end
+
+        it "can write new sub-elements" do
+          expect { ros.key.new_subkey = 43 }.not_to raise_error
+        end
+
+        it "can write existing sub-elements" do
+          expect { ros.key.subkey = 43 }.not_to raise_error
+        end
+      end
+    end
   end # describe behavior it inherits from OpenStruct
 end