chore: set env var using IO.popen argument

.travis.yml

@@ -8,7 +8,6 @@ script:
   - bundle install
   - bundle exec rake spec
   - bundle exec rake package
-  - script/kill-leftover-processes-on-travis.sh
 deploy:
 - provider: releases
   api_key:

spec/integration_spec.rb

@@ -74,7 +74,6 @@
 
 
   after(:all) do
-    puts "bethtest killing #{@pipe.pid}"
     Process.kill 'KILL', @pipe.pid
   end
 end

spec/integration_with_custom_header_spec.rb

@@ -1,8 +1,6 @@
 describe "pact-provider-verifier with basic auth" do
   before(:all) do
-    ENV['USE_BASIC_AUTH'] = 'true'
-    @pipe = IO.popen("bundle exec rackup -p 4570 spec/support/config.ru")
-    ENV.delete('USE_BASIC_AUTH')
+    @pipe = IO.popen({'USE_BASIC_AUTH' => 'true'}, %w{bundle exec rackup -p 4570 spec/support/config.ru})
     sleep 2
   end
 
@@ -21,7 +19,6 @@
   end
 
   after(:all) do
-    puts "bethtest killing #{@pipe.pid}"
     Process.kill 'KILL', @pipe.pid
   end
 end

spec/support/config.ru

@@ -1,6 +1,7 @@
 require_relative 'provider'
 
 if ENV['USE_BASIC_AUTH'] == 'true'
+  puts "Starting server with basic auth"
   use Rack::Auth::Basic, "Restricted Area" do |username, password|
     username == 'pact' and password == 'pact'
   end