Fix lint errors, other cleanups

- ensure that lint check gets run when prior to running unittests
- fixes a description of the default rake command
- adds a dependency on Faraday, a HTTP/REST client

src/ruby/Rakefile

@@ -35,18 +35,20 @@ namespace :spec do
 
         t.pattern = spec_files
         t.rspec_opts = "--tag #{suite[:tag]}" if suite[:tag]
-        t.rspec_opts = suite[:tags].map{ |t| "--tag #{t}" }.join(' ') if suite[:tags]
+        if suite[:tags]
+          t.rspec_opts = suite[:tags].map { |x| "--tag #{x}" }.join(' ')
+        end
       end
     end
   end
 end
 
-desc 'Run compiles the extension, runs all the tests'
+desc 'Compiles the extension then runs all the tests'
 task :all
 
 task default: :all
-task 'spec:suite:wrapper' => :compile
+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']
+task all: ['spec:suite:idiomatic', 'spec:suite:bidi', 'spec:suite:server']

src/ruby/bin/interop/interop_client.rb

@@ -79,7 +79,6 @@ end
 
 RX_CERT = /-----BEGIN CERTIFICATE-----\n.*?-----END CERTIFICATE-----\n/m
 
-
 # creates a Credentials from the production certificates.
 def prod_creds
   cert_text = load_prod_cert

src/ruby/grpc.gemspec

@@ -20,6 +20,7 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.platform      = Gem::Platform::RUBY
 
+  s.add_dependency 'faraday', '~> 0.9'
   s.add_dependency 'google-protobuf', '~> 3.0.0alpha.1.1'
   s.add_dependency 'logging', '~> 1.8'
   s.add_dependency 'minitest', '~> 5.4'  # reqd for interop tests

src/ruby/spec/channel_spec.rb

@@ -29,8 +29,6 @@
 
 require 'grpc'
 
-FAKE_HOST='localhost:0'
-
 def load_test_certs
   test_root = File.join(File.dirname(__FILE__), 'testdata')
   files = ['ca.pem', 'server1.key', 'server1.pem']
@@ -38,6 +36,8 @@ def load_test_certs
 end
 
 describe GRPC::Core::Channel do
+  FAKE_HOST = 'localhost:0'
+
   def create_test_cert
     GRPC::Core::Credentials.new(load_test_certs[0])
   end