ci: add rspec-retry (#132)

Integration tests are flaky.. make sure they are retried a few times
before returning an error.

Author: dkarter

Gemfile

@@ -7,5 +7,6 @@ group :test do
   gem 'pry-byebug'
   gem 'rake', '~> 12.3.3'
   gem 'rspec'
+  gem 'rspec-retry'
   gem 'vimrunner'
 end

Gemfile.lock

@@ -24,6 +24,8 @@ GEM
     rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
+    rspec-retry (0.6.2)
+      rspec-core (> 3.3)
     rspec-support (3.8.0)
     vimrunner (0.3.4)
 
@@ -35,6 +37,7 @@ DEPENDENCIES
   pry-byebug
   rake (~> 12.3.3)
   rspec
+  rspec-retry
   vimrunner
 
 BUNDLED WITH

spec/spec_helper.rb

@@ -3,6 +3,7 @@
 require 'vimrunner'
 require 'vimrunner/rspec'
 require 'securerandom'
+require 'rspec/retry'
 
 Vimrunner::RSpec.configure do |config|
   # Use a single Vim instance for the test suite. Set to false to use an
@@ -27,6 +28,21 @@
 end
 
 RSpec.configure do |config|
+
+  # RSpec Retry
+  # ===========
+  # show retry status in spec process
+  config.verbose_retry = true
+
+  # show exception that triggers a retry if verbose_retry is set to true
+  config.display_try_failure_messages = true
+
+  # retry each spec 3 times
+  config.around :each do |ex|
+    ex.run_with_retry retry: 3
+  end
+  # ============
+
   config.around do |example|
     Dir.mktmpdir do |dir|
       Dir.chdir(dir) do