Add guard to automatically run tests

This adds guard to automatically run relevant tests on file save. It can
be run with `bundle exec guard`.

Gemfile

@@ -411,6 +411,7 @@ group :test do
   gem 'concurrent-ruby', '~> 1.1'
   gem 'test-prof', '~> 0.10.0'
   gem 'rspec_junit_formatter'
+  gem 'guard-rspec'
 end
 
 gem 'octokit', '~> 4.9'

Gemfile.lock

@@ -446,6 +446,20 @@ GEM
       googleapis-common-protos-types (~> 1.0)
     gssapi (1.2.0)
       ffi (>= 1.0.1)
+    guard (2.15.1)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.9.12)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-compat (1.2.1)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
     haml (5.0.4)
       temple (>= 0.8.0)
       tilt
@@ -561,6 +575,10 @@ GEM
       xml-simple
     licensee (8.9.2)
       rugged (~> 0.24)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
     locale (2.1.2)
     lograge (0.10.0)
       actionpack (>= 4)
@@ -570,6 +588,7 @@ GEM
     loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
+    lumberjack (1.0.13)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     mail_room (0.9.1)
@@ -598,6 +617,7 @@ GEM
       mustermann (~> 1.0.0)
     nakayoshi_fork (0.0.4)
     nap (1.1.0)
+    nenv (0.3.0)
     net-ldap (0.16.0)
     net-ntp (2.1.3)
     net-ssh (5.2.0)
@@ -608,6 +628,9 @@ GEM
       mini_portile2 (~> 2.4.0)
     nokogumbo (1.5.0)
       nokogiri
+    notiffany (0.1.3)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
     numerizer (0.1.1)
     oauth (0.5.4)
     oauth2 (1.4.1)
@@ -898,6 +921,7 @@ GEM
     ruby-progressbar (1.10.1)
     ruby-saml (1.7.2)
       nokogiri (>= 1.5.10)
+    ruby_dep (1.5.0)
     ruby_parser (3.13.1)
       sexp_processor (~> 4.9)
     rubyntlm (0.6.2)
@@ -939,6 +963,7 @@ GEM
       faraday (>= 0.7.6, < 1.0)
     settingslogic (2.0.9)
     sexp_processor (4.12.0)
+    shellany (0.0.1)
     shoulda-matchers (4.0.1)
       activesupport (>= 4.2.0)
     sidekiq (5.2.7)
@@ -1193,6 +1218,7 @@ DEPENDENCIES
   graphql-docs (~> 1.6.0)
   grpc (~> 1.24.0)
   gssapi
+  guard-rspec
   haml_lint (~> 0.31.0)
   hamlit (~> 2.8.8)
   hangouts-chat (~> 0.0.5)

Guardfile

+# frozen_string_literal: true
+
+# More info at https://github.com/guard/guard#readme
+
+# If using spring, change command to "spring rspec"
+guard :rspec, cmd: "bundle exec rspec" do
+  require "guard/rspec/dsl"
+  dsl = Guard::RSpec::Dsl.new(self)
+
+  directories %w(app ee lib spec)
+
+  # RSpec files
+  rspec = dsl.rspec
+  watch(rspec.spec_helper) { rspec.spec_dir }
+  watch(rspec.spec_support) { rspec.spec_dir }
+  watch(rspec.spec_files)
+
+  # Ruby files
+  ruby = dsl.ruby
+  dsl.watch_spec_files_for(ruby.lib_files)
+
+  # Rails files
+  rails = dsl.rails(view_extensions: %w(erb haml slim))
+  dsl.watch_spec_files_for(rails.app_files)
+  dsl.watch_spec_files_for(rails.views)
+
+  watch(rails.controllers) do |m|
+    [
+      rspec.spec.call("routing/#{m[1]}_routing"),
+      rspec.spec.call("controllers/#{m[1]}_controller")
+    ]
+  end
+
+  # Rails config changes
+  watch(rails.spec_helper)     { rspec.spec_dir }
+  watch(rails.routes)          { "#{rspec.spec_dir}/routing" }
+  watch(rails.app_controller)  { "#{rspec.spec_dir}/controllers" }
+
+  # Capybara features specs
+  watch(rails.view_dirs)     { |m| rspec.spec.call("features/#{m[1]}") }
+  watch(rails.layouts)       { |m| rspec.spec.call("features/#{m[1]}") }
+end

doc/development/testing_guide/best_practices.md

@@ -44,6 +44,20 @@ bundle exec rspec
 bundle exec rspec spec/[path]/[to]/[spec].rb
 ```
 
+Use [guard](https://github.com/guard/guard) to continuously monitor for changes and only run matching tests:
+
+```sh
+bundle exec guard
+```
+
+When using spring and guard together, consider adjusting Guardfile:
+
+```ruby
+guard :rspec, cmd: "spring rspec" do
+  # ...
+end
+```
+
 ### General guidelines
 
 - Use a single, top-level `describe ClassName` block.