Updates the Rakefile

- simplify the test suite namespace
- fix bug in test suite setup where wrappper tests were run twice
- removes unnecessary descs
- add bunder's gem tasks for release and installation

src/ruby/Rakefile

@@ -2,14 +2,17 @@
 require 'rake/extensiontask'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
+require 'bundler/gem_tasks'
 
-desc 'Run Rubocop to check for style violations'
+# Add rubocop style checking tasks
 RuboCop::RakeTask.new
 
+# Add the extension compiler task
 Rake::ExtensionTask.new 'grpc' do |ext|
   ext.lib_dir = File.join('lib', 'grpc')
 end
 
+# Define the test suites
 SPEC_SUITES = [
   { id: :wrapper, title: 'wrapper layer', files: %w(spec/*.rb) },
   { id: :idiomatic, title: 'idiomatic layer', dir: %w(spec/generic),
@@ -19,19 +22,18 @@ SPEC_SUITES = [
   { id: :server, title: 'rpc server thread tests', dir: %w(spec/generic),
     tag: 'server' }
 ]
-
-desc 'Run all RSpec tests'
-namespace :spec do
 namespace :suite do
   SPEC_SUITES.each do |suite|
-      desc "Run all specs in #{suite[:title]} spec suite"
+    desc "Run all specs in the #{suite[:title]} spec suite"
     RSpec::Core::RakeTask.new(suite[:id]) do |t|
       spec_files = []
       suite[:files].each { |f| spec_files += Dir[f] } if suite[:files]
 
-        if suite[:dirs]
-          suite[:dirs].each { |f| spec_files += Dir["#{f}/**/*_spec.rb"] }
+      if suite[:dir]
+        suite[:dir].each { |f| spec_files += Dir["#{f}/**/*_spec.rb"] }
       end
+      helper = 'spec/spec_helper.rb'
+      spec_files << helper unless spec_files.include?(helper)
 
       t.pattern = spec_files
       t.rspec_opts = "--tag #{suite[:tag]}" if suite[:tag]
@@ -41,14 +43,13 @@ namespace :spec do
     end
   end
 end
-end
 
-desc 'Compiles the extension then runs all the tests'
-task :all
+# Define dependencies between the suites.
+task 'suite:wrapper' => [:compile, :rubocop]
+task 'suite:idiomatic' => 'suite:wrapper'
+task 'suite:bidi' => 'suite:wrapper'
+task 'suite:server' => 'suite:wrapper'
 
+desc 'Compiles the gRPC extension then runs all the tests'
+task all: ['suite:idiomatic', 'suite:bidi', 'suite:server']
 task default: :all
-task 'spec:suite:wrapper' => [:compile, :rubocop]
-task 'spec:suite:idiomatic' => 'spec:suite:wrapper'
-task 'spec:suite:bidi' => 'spec:suite:wrapper'
-task 'spec:suite:server' => 'spec:suite:wrapper'
-task all: ['spec:suite:idiomatic', 'spec:suite:bidi', 'spec:suite:server']