Add specs for Queue#freeze and SizedQueue#freeze

core/queue/freeze_spec.rb

@@ -0,0 +1,6 @@
+require_relative '../../spec_helper'
+require_relative '../../shared/queue/freeze'
+
+describe "Queue#freeze" do
+  it_behaves_like :queue_freeze, :freeze, -> { Queue.new }
+end

core/sizedqueue/freeze_spec.rb

@@ -0,0 +1,6 @@
+require_relative '../../spec_helper'
+require_relative '../../shared/queue/freeze'
+
+describe "SizedQueue#freeze" do
+  it_behaves_like :queue_freeze, :freeze, -> { SizedQueue.new(1) }
+end

shared/queue/freeze.rb

@@ -0,0 +1,18 @@
+describe :queue_freeze, shared: true do
+  ruby_version_is ""..."3.3" do
+    it "can be frozen" do
+      queue = @object.call
+      queue.freeze
+      queue.should.frozen?
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "raises an exception when freezing" do
+      queue = @object.call
+      -> {
+        queue.freeze
+      }.should raise_error(TypeError, "cannot freeze #{queue}")
+    end
+  end
+end