Fix the specs for HttpStatusAgent

- Raplace hand-made mocking for web requests with Webmock

- Stop overriding internal methods of Agent like `interpolated`, because
  that made the specs not reflect actual behavior

spec/controllers/http_status_agent_spec.rb

@@ -1,53 +1,29 @@
 require 'rails_helper'
 
-class MockResponse < Struct.new(:status, :headers, :url)
-  alias_method :to_hash, :to_h
-end
-
 describe 'HttpStatusAgent' do
-
-  let(:agent) do
-    Agents::HttpStatusAgent.new(:name => SecureRandom.uuid, :options => valid_params).tap do |a|
-      a.service = services(:generic)
-      a.user = users(:jane)
-      a.options['url'] = 'http://google.com'
-      a.options['headers_to_save'] = 'Server'
-      a.save!
-
-      def a.interpolate_with(e, &block)
-        @the_event = e
-        block.call
-      end
-
-      def a.interpolated
-        @the_event.payload
-      end
-
-      def a.create_event event
-        @the_created_events ||= []
-        @the_created_events << event
-      end
-
-      def a.the_created_events
-        @the_created_events || []
-      end
-
-      def a.faraday
-        @faraday ||= Struct.new(:programmed_responses).new({}).tap do |f|
-                       def f.get url
-                         programmed_responses[url] || raise('invalid url')
-                       end
-
-                       def f.set url, response, time = nil
-                         sleep(time/1000) if time
-                         programmed_responses[url] = response
-                       end
-                     end
-      end
-    end
+  before do
+    stub_request(:get, 'http://google.com/')
   end
 
-  let(:valid_params) { {} }
+  let(:agent_options) do
+    {
+      url: 'http://google.com/',
+      headers_to_save: 'Server'
+    }
+  end
+
+  let(:agent) do
+    Agents::HttpStatusAgent.create!(
+      name: SecureRandom.uuid,
+      service: services(:generic),
+      user: users(:jane),
+      options: agent_options
+    )
+  end
+
+  def created_events
+    agent.events.reorder(id: :asc)
+  end
 
   describe "working" do
     it "should be working when the last status is 200" do
@@ -77,27 +53,21 @@ describe 'HttpStatusAgent' do
   end
 
   describe "check" do
+    let(:url) { "http://#{SecureRandom.uuid}/" }
 
-    before do
-
-      def agent.interpolated
-        @interpolated ||= { :url => SecureRandom.uuid, :headers_to_save => '' }
-      end
-
-      def agent.check_this_url url, local_headers
-        @url = url
-        @local_headers = local_headers
-      end
-
-      def agent.checked_url
-        @url
-      end
-
+    let(:agent_options) do
+      {
+        url: url,
+        headers_to_save: ''
+      }
     end
 
     it "should check the url" do
+      stub = stub_request(:get, url)
+
       agent.check
-      expect(agent.checked_url).to eq(agent.interpolated[:url])
+
+      expect(stub).to have_been_requested
     end
 
   end
@@ -106,15 +76,22 @@ describe 'HttpStatusAgent' do
 
     describe "with an event with a successful ping" do
 
-      let(:successful_url) { SecureRandom.uuid }
+      let(:successful_url) { "http://#{SecureRandom.uuid}/" }
 
       let(:status_code) { 200 }
       let(:header) { SecureRandom.uuid }
       let(:header_value) { SecureRandom.uuid }
 
+      before do
+        stub_request(:get, successful_url).to_return(status: status_code)
+      end
+
+      let(:agent_options) do
+        super().merge(url: successful_url)
+      end
+
       let(:event_with_a_successful_ping) do
-        agent.faraday.set(successful_url, MockResponse.new(status_code, {}, successful_url))
-        Event.new.tap { |e| e.payload = { url: successful_url, headers_to_save: "" } }
+        Event.new(payload: { url: successful_url, headers_to_save: "" })
       end
 
       let(:events) do
@@ -123,17 +100,17 @@ describe 'HttpStatusAgent' do
 
       it "should create one event" do
         agent.receive events
-        expect(agent.the_created_events.count).to eq(1)
+        expect(created_events.count).to eq(1)
       end
 
       it "should note that the successful response succeeded" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['response_received']).to eq(true)
+        expect(created_events.last[:payload]['response_received']).to eq(true)
       end
 
       it "should return the status code" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['status']).to eq('200')
+        expect(created_events.last[:payload]['status']).to eq('200')
       end
 
       it "should remember the status" do
@@ -143,51 +120,68 @@ describe 'HttpStatusAgent' do
 
       it "should record the time spent waiting for the reply" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['elapsed_time']).not_to be_nil
+        expect(created_events.last[:payload]['elapsed_time']).not_to be_nil
       end
 
       it "should not return a header" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['headers']).to be_nil
+        expect(created_events.last[:payload]['headers']).to be_nil
       end
 
       describe "but the last status code was 200" do
-        before { agent.memory['last_status'] = '200' }
+        before do
+          agent.memory['last_status'] = '200'
+          agent.save!
+        end
 
         describe "and no duplication settings have been set" do
           it "should create one event" do
             agent.receive events
-            expect(agent.the_created_events.count).to eq(1)
+            expect(created_events.count).to eq(1)
           end
         end
 
         describe "and change settings have been set to true" do
-          before { agent.options['changes_only'] = 'true' }
+          before do
+            agent.options[:changes_only] = 'true'
+            agent.save!
+          end
+
           it "should NOT create any events" do
             agent.receive events
-            expect(agent.the_created_events.count).to eq(0)
+            expect(created_events.count).to eq(0)
           end
 
           describe "but actually, the ping failed" do
 
-            let(:failing_url)    { SecureRandom.uuid }
-            let(:event_with_a_failing_ping)    { Event.new.tap { |e| e.payload = { url: failing_url, headers_to_save: "" } } }
+            let(:failing_url)    { "http://#{SecureRandom.uuid}/" }
+            let(:event_with_a_failing_ping) do
+              Event.new(payload: { url: failing_url, headers_to_save: "" })
+            end
             let(:events) do
               [event_with_a_successful_ping, event_with_a_failing_ping]
             end
 
+            before do
+              stub_request(:get, failing_url).to_return(status: 500)
+            end
+
             it "should create an event" do
               agent.receive events
-              expect(agent.the_created_events.count).to eq(1)
+              expect(created_events.count).to eq(1)
             end
           end
         end
 
         describe "and change settings have been set to false" do
-          before { agent.options['changes_only'] = 'false' }
+          before do
+            agent.options[:changes_only] = 'false'
+            agent.save!
+          end
+
           it "should create one event" do
             agent.receive events
-            expect(agent.the_created_events.count).to eq(1)
+            expect(created_events.count).to eq(1)
           end
         end
 
@@ -198,7 +192,7 @@ describe 'HttpStatusAgent' do
 
         it "should return the status code" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['status']).to eq('500')
+          expect(created_events.last[:payload]['status']).to eq('500')
         end
 
         it "should remember the status" do
@@ -209,39 +203,41 @@ describe 'HttpStatusAgent' do
 
       it "should return the original url" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['url']).to eq(successful_url)
+        expect(created_events.last[:payload]['url']).to eq(successful_url)
       end
 
       it "should return the final url" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['final_url']).to eq(successful_url)
+        expect(created_events.last[:payload]['final_url']).to eq(successful_url)
       end
 
       it "should return whether the url redirected" do
         agent.receive events
-        expect(agent.the_created_events[0][:payload]['redirected']).to eq(false)
+        expect(created_events.last[:payload]['redirected']).to eq(false)
       end
 
       describe "but the ping returns a status code of 0" do
+        before do
+          stub_request(:get, successful_url).to_return(status: 0)
+        end
 
         let(:event_with_a_successful_ping) do
-          agent.faraday.set(successful_url, MockResponse.new(0, {}, successful_url))
-          Event.new.tap { |e| e.payload = { url: successful_url, headers_to_save: "" } }
+          Event.new(payload: { url: successful_url, headers_to_save: "" })
         end
 
         it "should create one event" do
           agent.receive events
-          expect(agent.the_created_events.count).to eq(1)
+          expect(created_events.count).to eq(1)
         end
 
         it "should note that no response was received" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['response_received']).to eq(false)
+          expect(created_events.last[:payload]['response_received']).to eq(false)
         end
 
         it "should return the original url" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['url']).to eq(successful_url)
+          expect(created_events.last[:payload]['url']).to eq(successful_url)
         end
 
         it "should remember no status" do
@@ -253,77 +249,91 @@ describe 'HttpStatusAgent' do
       end
 
       describe "but the ping returns a status code of -1" do
+        before do
+          stub_request(:get, successful_url).to_return(status: -1)
+        end
 
         let(:event_with_a_successful_ping) do
-          agent.faraday.set(successful_url, MockResponse.new(-1, {}, successful_url))
-          Event.new.tap { |e| e.payload = { url: successful_url, headers_to_save: "" } }
+          Event.new(payload: { url: successful_url, headers_to_save: "" })
         end
 
         it "should create one event" do
           agent.receive events
-          expect(agent.the_created_events.count).to eq(1)
+          expect(created_events.count).to eq(1)
         end
 
         it "should note that no response was received" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['response_received']).to eq(false)
+          expect(created_events.last[:payload]['response_received']).to eq(false)
         end
 
         it "should return the original url" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['url']).to eq(successful_url)
+          expect(created_events.last[:payload]['url']).to eq(successful_url)
         end
 
       end
 
       describe "and with one event with a failing ping" do
 
-        let(:failing_url)    { SecureRandom.uuid }
-        let(:event_with_a_failing_ping)    { Event.new.tap { |e| e.payload = { url: failing_url, headers_to_save: "" } } }
-
+        let(:failing_url)    { "http://#{SecureRandom.uuid}/" }
+        let(:event_with_a_failing_ping) do
+          Event.new(payload: { url: failing_url, headers_to_save: "" })
+        end
         let(:events) do
           [event_with_a_successful_ping, event_with_a_failing_ping]
         end
 
+        before do
+          stub_request(:get, failing_url).to_raise(RuntimeError) #to_return(status: 500)
+        end
+
         it "should create two events" do
           agent.receive events
-          expect(agent.the_created_events.count).to eq(2)
+          expect(created_events.count).to eq(2)
         end
 
         it "should note that the failed response failed" do
           agent.receive events
-          expect(agent.the_created_events[1][:payload]['response_received']).to eq(false)
+          expect(created_events[1][:payload]['response_received']).to eq(false)
         end
 
         it "should note that the successful response succeeded" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['response_received']).to eq(true)
+          expect(created_events[0][:payload]['response_received']).to eq(true)
         end
 
         it "should return the original url on both events" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['url']).to eq(successful_url)
-          expect(agent.the_created_events[1][:payload]['url']).to eq(failing_url)
+          expect(created_events[0][:payload]['url']).to eq(successful_url)
+          expect(created_events[1][:payload]['url']).to eq(failing_url)
         end
 
         it "should record the time spent waiting for the reply" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['elapsed_time']).not_to be_nil
-          expect(agent.the_created_events[1][:payload]['elapsed_time']).not_to be_nil
+          expect(created_events[0][:payload]['elapsed_time']).not_to be_nil
+          expect(created_events[1][:payload]['elapsed_time']).not_to be_nil
         end
 
       end
 
       describe "with a header specified" do
+        before do
+          stub_request(:get, successful_url).to_return(
+            status: status_code,
+            headers: { header => header_value }
+          )
+        end
+
         let(:event_with_a_successful_ping) do
-          agent.faraday.set(successful_url, MockResponse.new(status_code, {header => header_value}, successful_url))
-          Event.new.tap { |e| e.payload = { url: successful_url, headers_to_save: header } }
+          Event.new(payload: { url: successful_url, headers_to_save: header })
         end
 
         it "should return the header value" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['headers']).not_to be_nil
-          expect(agent.the_created_events[0][:payload]['headers'][header]).to eq(header_value)
+          event = created_events.last
+          expect(event[:payload]['headers']).not_to be_nil
+          expect(event[:payload]['headers'][header]).to eq(header_value)
         end
 
       end
@@ -331,19 +341,28 @@ describe 'HttpStatusAgent' do
       describe "with existing and non-existing headers specified" do
         let(:nonexistant_header) { SecureRandom.uuid }
 
+        before do
+          stub_request(:get, successful_url).to_return(
+            status: status_code,
+            headers: { header => header_value }
+          )
+        end
+
         let(:event_with_a_successful_ping) do
-          agent.faraday.set(successful_url, MockResponse.new(status_code, {header => header_value}, successful_url))
-          Event.new.tap { |e| e.payload = { url: successful_url, headers_to_save: header + "," + nonexistant_header } }
+          Event.new(payload: {
+                      url: successful_url,
+                      headers_to_save: header + "," + nonexistant_header
+                    })
         end
 
         it "should return the existing header's value" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['headers'][header]).to eq(header_value)
+          expect(created_events.last[:payload]['headers'][header]).to eq(header_value)
         end
 
         it "should return nil for the nonexistant header" do
           agent.receive events
-          expect(agent.the_created_events[0][:payload]['headers'][nonexistant_header]).to be_nil
+          expect(created_events.last[:payload]['headers'][nonexistant_header]).to be_nil
         end
 
       end