gems: include rubocop-rspec and fix linting

.rubocop.yml

@@ -1,5 +1,6 @@
 require:
 - rubocop-rake
+- rubocop-rspec
 
 AllCops:
   TargetRubyVersion: '2.5'
@@ -89,3 +90,13 @@ Style/Semicolon:
 
 Style/SymbolArray:
   Enabled: false
+
+RSpec/ExampleLength:
+  Max: 10
+
+RSpec/FilePath:
+  CustomTransform:
+    OpenVPNStatusWeb: openvpn-status-web
+
+RSpec/MultipleExpectations:
+  Max: 5

openvpn-status-web.gemspec

@@ -39,5 +39,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rubocop', '~> 1.6.1'
   s.add_development_dependency 'rubocop-rake', '~> 0.5.1'
+  s.add_development_dependency 'rubocop-rspec', '~> 2.1.0'
   s.add_development_dependency 'solargraph', ' ~> 0.40.0'
 end

spec/openvpn-status-web/parser/modern_stateless_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative '../spec_helper'
+require_relative '../../spec_helper'
 
 describe OpenVPNStatusWeb::Parser::ModernStateless do
   {
@@ -8,7 +8,7 @@ describe OpenVPNStatusWeb::Parser::ModernStateless do
     3 => status_v3
   }.each do |version, status|
     context "for status-version #{version}" do
-      context 'for client list' do
+      context 'with client list' do
         it 'parses common names' do
           expect(status.client_list.map { |client| client[0] }).to eq(%w[foo bar])
         end
@@ -34,7 +34,7 @@ describe OpenVPNStatusWeb::Parser::ModernStateless do
         end
       end
 
-      context 'for routing table' do
+      context 'with routing table' do
         it 'parses virtual addresses' do
           expect(status.routing_table.map { |route| route[0] }).to eq(['192.168.0.0/24', '192.168.66.2', '192.168.66.3', '2001:db8:0:0::1000'])
         end

spec/openvpn-status-web/parser/v1_spec.rb

@@ -1,13 +1,13 @@
 # frozen_string_literal: true
 
-require_relative '../spec_helper'
+require_relative '../../spec_helper'
 
 describe OpenVPNStatusWeb::Parser::V1 do
   def status
     status_v1
   end
 
-  context 'for client list' do
+  context 'with client list' do
     it 'parses common names' do
       expect(status.client_list.map { |client| client[0] }).to eq(%w[foo bar])
     end
@@ -33,7 +33,7 @@ describe OpenVPNStatusWeb::Parser::V1 do
     end
   end
 
-  context 'for routing table' do
+  context 'with routing table' do
     it 'parses virtual addresses' do
       expect(status.routing_table.map { |route| route[0] }).to eq(['192.168.0.0/24', '192.168.66.2', '192.168.66.3', '2001:db8:0:0::1000'])
     end