Fix message queue shutdown to raise valid error

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Fixed
 * Fix defining object finalizer in Ruby 3.1 to reference a UUID string
   by Vadim Kononov(@vkononov)
+* Fix message queue shutdown to raise valid error
 
 ## [v0.14.0] - 2020-09-12
 

lib/finite_machine/message_queue.rb

@@ -119,16 +119,18 @@ def join(timeout = nil)
       timeout.nil? ? @thread.join : @thread.join(timeout)
     end
 
-    # Shut down this event queue and clean it up
+    # Shut down this message queue and clean it up
     #
     # @example
-    #   event_queue.shutdown
+    #   message_queue.shutdown
+    #
+    # @raise [FiniteMachine::MessageQueueDeadError]
     #
     # @return [Boolean]
     #
     # @api public
     def shutdown
-      raise EventQueueDeadError, "event queue already dead" if @dead
+      raise MessageQueueDeadError, "message queue already dead" if @dead
 
       queue = []
       @mutex.synchronize do

spec/unit/message_queue_spec.rb

@@ -59,4 +59,15 @@
     expect(event_queue.running?).to be(false)
     event_queue.join(0.001)
   end
+
+  it "raises an error when the message queue is already shut down" do
+    message_queue = described_class.new
+    message_queue.start
+    message_queue.shutdown
+
+    expect {
+      message_queue.shutdown
+    }.to raise_error(FiniteMachine::MessageQueueDeadError,
+                     "message queue already dead")
+  end
 end