chore: print diff after approvals failure

spec/spec_helper.rb

@@ -12,18 +12,13 @@
 require 'sucker_punch/testing/inline'
 require 'webmock/rspec'
 require 'pact_broker/policies'
-require 'approvals/rspec'
 
 Dir.glob("./spec/support/**/*.rb") { |file| require file  }
 
 WebMock.disable_net_connect!(allow_localhost: true)
 
 I18n.config.enforce_available_locales = false
 
-Approvals.configure do |c|
-  c.approvals_path = 'spec/fixtures/approvals/'
-end
-
 RSpec.configure do | config |
   config.before :each do
     PactBroker.reset_configuration
@@ -53,6 +48,19 @@
   config.example_status_persistence_file_path = "./spec/examples.txt"
   config.filter_run_excluding skip: true
 
+  config.after(:each) do | example, something |
+    if example.exception.is_a?(Approvals::ApprovalError)
+      require "pact/support"
+      parts = example.exception.message.split('"')
+      received_file = parts[1]
+      approved_file = parts[3]
+      received_hash = JSON.parse(File.read(received_file))
+      approved_hash = JSON.parse(File.read(approved_file))
+      diff = Pact::Matchers.diff(approved_hash, received_hash)
+      puts Pact::Matchers::UnixDiffFormatter.call(diff)
+    end
+  end
+
   def app
     PactBroker::API
   end

spec/support/approvals.rb

@@ -0,0 +1,24 @@
+require 'approvals/rspec'
+require 'pact/support'
+
+Approvals.configure do |c|
+  c.approvals_path = 'spec/fixtures/approvals/'
+end
+
+def print_diff(exception)
+  parts = exception.message.split('"')
+  received_file = parts[1]
+  approved_file = parts[3]
+  received_hash = JSON.parse(File.read(received_file))
+  approved_hash = JSON.parse(File.read(approved_file))
+  diff = Pact::Matchers.diff(approved_hash, received_hash)
+  puts Pact::Matchers::UnixDiffFormatter.call(diff)
+end
+
+RSpec.configure do | config |
+  config.after(:each) do | example |
+    if example.exception.is_a?(Approvals::ApprovalError)
+      print_diff(example.exception)
+    end
+  end
+end