Travis grooming

.travis.yml

@@ -1,4 +1,6 @@
-os: osx
+os: 
+  - osx
+  - linux
 language: ruby
 install: true
 
@@ -11,7 +13,14 @@ gemfile:
   - gemfiles/Gemfile.xcodeproj-edge
 rvm:
   - 2.5.0
-  - ruby-2.0.0-p648
+  - 2.6.0
+  - 2.7.0
+
+matrix:
+  include:
+  - rvm: 2.7.0
+    os: linux
+    env: XCAKE_CI_TASKS=LINT
 
 before_script:
   - gem install bundler -v "~> 1.17"

spec/integration_spec.rb

@@ -1,6 +1,7 @@
 require 'spec_helper'
 require 'yaml'
 require 'simplecov'
+require 'os'
 
 SimpleCov.command_name 'test:integration'
 
@@ -61,13 +62,17 @@ def self.list_files(directory)
             expect(Dir['temp/*.xcodeproj']).to eq(%w(temp/Project.xcodeproj))
           end
         end
-        it 'Should build fixture with xcodebuild with no errors' do
-          Dir.chdir(fixture) do
-            Xcake.make_helper
-            Dir.chdir('temp') do
-              expect('xcodebuild clean build -sdk iphonesimulator &> xcode_output.txt').to succeed
+
+        # this cannot be tested on any OS other than macOS
+        if OS.mac?
+          it 'Should build fixture with xcodebuild with no errors' do
+            Dir.chdir(fixture) do
+              Xcake.make_helper
+              Dir.chdir('temp') do
+                expect('xcodebuild clean build -sdk iphonesimulator &> xcode_output.txt').to succeed
+              end
+              expect(Xcake.list_files('temp')).to include(*Xcake.list_files('output'))
             end
-            expect(Xcake.list_files('temp')).to include(*Xcake.list_files('output'))
           end
         end
       end

xcake.gemspec

@@ -31,12 +31,14 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
   spec.add_dependency 'activesupport', '< 5'
 
   spec.add_development_dependency 'bundler', '>= 1.10'
+  spec.add_development_dependency 'os', '~> 1.0'
   spec.add_development_dependency 'pry', '~> 0.10'
   spec.add_development_dependency 'pry-rescue'
   spec.add_development_dependency 'pry-stack_explorer'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rb-readline', '~> 0.5.4'
   spec.add_development_dependency 'rspec', '~> 3.4.0'
+  spec.add_development_dependency 'rubocop', '~> 0.64.0'
   spec.add_development_dependency 'rubocop-git', '~> 0.1.1'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'yard', '~> 0.9'