1 files changed, 12 insertions, 1 deletions
diff --git a/spec/ruby/core/queue/initialize_spec.rb b/spec/ruby/core/queue/initialize_spec.rb
index 83c7e595fe..c45abcd29d 100644
--- a/spec/ruby/core/queue/initialize_spec.rb
+++ b/spec/ruby/core/queue/initialize_spec.rb
@@ -7,6 +7,10 @@ describe "Queue#initialize" do
     q.should.empty?
   end
 
+  it "is a private method" do
+    Queue.private_instance_methods.include?(:initialize).should == true
+  end
+
   ruby_version_is '3.1' do
     it "adds all elements of the passed Enumerable to self" do
       q = Queue.new([1, 2, 3])
@@ -30,9 +34,16 @@ describe "Queue#initialize" do
       q.should.empty?
     end
 
-    it "raises if the provided Enumerable does not respond to #to_a" do
+    it "raises TypeError if the provided Enumerable does not respond to #to_a" do
       enumerable = MockObject.new('mock-enumerable')
       -> { Queue.new(enumerable) }.should raise_error(TypeError, "can't convert MockObject into Array")
     end
+
+    it "raises TypeError if #to_a does not return Array" do
+      enumerable = MockObject.new('mock-enumerable')
+      enumerable.should_receive(:to_a).and_return("string")
+
+      -> { Queue.new(enumerable) }.should raise_error(TypeError, "can't convert MockObject to Array (MockObject#to_a gives String)")
+    end
   end
 end