Add clear_process_configuration method

Added a `clear_process_configuration` method to BusinessProcess, which
can allow someone to clear the steps, transitions, start, and
subscriptions of a BusinessProcess.

Additionally:
- Added an `attr_accessor` for `find_case_callback` so that a user of
BusinessProcess can change it if needed
- Added debug logging around subscribing and unsubscribing, which can
make local development (or other debugging) easier

Author: MichaelCrawfordNava

template/{{app_name}}/engines/flex/app/models/flex/business_process.rb

@@ -2,7 +2,7 @@ module Flex
   class BusinessProcess
     include Step
 
-    attr_accessor :name, :description, :steps, :start, :transitions
+    attr_accessor :name, :description, :steps, :start, :transitions, :find_case_callback
 
     def initialize(name:, find_case_callback:, description: "", steps: {}, start: "", transitions: {})
       @subscriptions = {}
@@ -33,6 +33,15 @@ def define_transitions(transitions)
       start_listening_for_events
     end
 
+    # @description This method will clear subscriptions and set steps, transitions, and start to their default values.
+    #     Only use this method if you are finished with the instance or plan to manually reset these values.
+    def clear_process_configuration
+      stop_listening_for_events
+      @steps = {}
+      @transitions = {}
+      @start = ""
+    end
+
     private
 
     def handle_event(event)
@@ -54,12 +63,14 @@ def get_event_names_from_transitions
 
     def start_listening_for_events
       get_event_names_from_transitions.each do |event_name|
+        Rails.logger.debug "Flex::BusinessProcess with name #{name} subscribing to event: #{event_name}"
         @subscriptions[event_name] = EventManager.subscribe(event_name, method(:handle_event))
       end
     end
 
     def stop_listening_for_events
       @subscriptions.each do |event_name, subscription|
+        Rails.logger.debug "Flex::BusinessProcess with name #{name} unsubscribing from event: #{event_name}"
         EventManager.unsubscribe(subscription)
       end
       @subscriptions.clear

template/{{app_name}}/engines/flex/spec/models/flex/business_process_spec.rb

@@ -17,7 +17,7 @@
     stub_const("Flex::EventManager", mock_event_manager)
   end
 
-  describe 'executing a business process' do
+  describe '#execute' do
     before do
       business_process.define_steps(mock_steps)
       allow(mock_steps["user_task"]).to receive(:execute)
@@ -43,7 +43,7 @@
     end
   end
 
-  describe 'when defining transitions' do
+  describe '#define_transitions' do
     before do
       allow(mock_event_manager).to receive(:subscribe)
       allow(mock_event_manager).to receive(:unsubscribe)
@@ -74,4 +74,31 @@
       expect(mock_event_manager).to have_received(:subscribe).with("event4", anything)
     end
   end
+
+  describe '#clear_process_configuration' do
+    before do
+      allow(mock_event_manager).to receive(:unsubscribe)
+      allow(mock_event_manager).to receive(:subscribe)
+      business_process.define_steps(mock_steps)
+      business_process.define_start("event1")
+      business_process.define_transitions({
+        "step1" => { "event1" => "step2" },
+        "step2" => { "event2" => "end" }
+      })
+    end
+
+    it 'clears all steps, transitions, and the start step' do
+      business_process.clear_process_configuration
+
+      expect(business_process.steps).to eq({})
+      expect(business_process.transitions).to eq({})
+      expect(business_process.start).to eq("")
+    end
+
+    it 'stops listening for events' do
+      business_process.clear_process_configuration
+
+      expect(mock_event_manager).to have_received(:unsubscribe).exactly(2).times
+    end
+  end
 end