1 files changed, 147 insertions, 0 deletions
diff --git a/spec/ruby/shared/queue/deque.rb b/spec/ruby/shared/queue/deque.rb
new file mode 100644
index 0000000000..616e56ec8a
--- /dev/null
+++ b/spec/ruby/shared/queue/deque.rb
@@ -0,0 +1,147 @@
+describe :queue_deq, shared: true do
+  it "removes an item from the queue" do
+    q = @object.call
+    q << Object.new
+    q.size.should == 1
+    q.send @method
+    q.size.should == 0
+  end
+
+  it "returns items in the order they were added" do
+    q = @object.call
+    q << 1
+    q << 2
+    q.send(@method).should == 1
+    q.send(@method).should == 2
+  end
+
+  it "blocks the thread until there are items in the queue" do
+    q = @object.call
+    v = 0
+
+    th = Thread.new do
+      q.send(@method)
+      v = 1
+    end
+
+    v.should == 0
+    q << Object.new
+    th.join
+    v.should == 1
+  end
+
+  it "removes an item from a closed queue" do
+    q = @object.call
+    q << 1
+    q.close
+    q.send(@method).should == 1
+  end
+
+  it "returns nil for a closed empty queue" do
+    q = @object.call
+    q.close
+    q.send(@method).should == nil
+  end
+
+  it "returns nil for an empty queue that becomes closed" do
+    q = @object.call
+
+    t = Thread.new {
+      q.send(@method).should == nil
+    }
+
+    Thread.pass until t.status == "sleep" && q.num_waiting == 1
+    q.close
+    t.join
+  end
+
+  describe "with a timeout" do
+    ruby_version_is "3.2" do
+      it "returns an item if one is available in time" do
+        q = @object.call
+
+        t = Thread.new {
+          q.send(@method, timeout: 1).should == 1
+        }
+        Thread.pass until t.status == "sleep" && q.num_waiting == 1
+        q << 1
+        t.join
+      end
+
+      it "returns nil if no item is available in time" do
+        q = @object.call
+
+        t = Thread.new {
+          q.send(@method, timeout: 0.1).should == nil
+        }
+        t.join
+      end
+
+      it "does nothing if the timeout is nil" do
+        q = @object.call
+        t = Thread.new {
+          q.send(@method, timeout: nil).should == 1
+        }
+        t.join(0.2).should == nil
+        q << 1
+        t.join
+      end
+
+      it "immediately returns nil if no item is available and the timeout is 0" do
+        q = @object.call
+        q << 1
+        q.send(@method, timeout: 0).should == 1
+        q.send(@method, timeout: 0).should == nil
+      end
+
+      it "raise TypeError if timeout is not a valid numeric" do
+        q = @object.call
+        -> { q.send(@method, timeout: "1") }.should raise_error(
+          TypeError,
+          "no implicit conversion to float from string",
+        )
+
+        -> { q.send(@method, timeout: false) }.should raise_error(
+          TypeError,
+          "no implicit conversion to float from false",
+        )
+      end
+
+      it "raise ArgumentError if non_block = true is passed too" do
+        q = @object.call
+        -> { q.send(@method, true, timeout: 1) }.should raise_error(
+          ArgumentError,
+          "can't set a timeout if non_block is enabled",
+        )
+      end
+    end
+  end
+
+  describe "in non-blocking mode" do
+    it "removes an item from the queue" do
+      q = @object.call
+      q << Object.new
+      q.size.should == 1
+      q.send(@method, true)
+      q.size.should == 0
+    end
+
+    it "raises a ThreadError if the queue is empty" do
+      q = @object.call
+      -> { q.send(@method, true) }.should raise_error(ThreadError)
+    end
+
+    it "removes an item from a closed queue" do
+      q = @object.call
+      q << 1
+      q.close
+      q.send(@method, true).should == 1
+    end
+
+    it "raises a ThreadError for a closed empty queue" do
+      q = @object.call
+      q.close
+      -> { q.send(@method, true) }.should raise_error(ThreadError)
+    end
+  end
+end