add ci file and script to run tests

.travis.yml

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+osx_image: xcode7.2
+language: objective-c
+
+env:
+  global:
+    - LANG=en_US.UTF-8
+
+cache:
+  - bundler
+
+before_install:
+  - brew update
+  - brew install carthage
+  - carthage bootstrap
+
+script:
+  - rake test
+
+# after_success:
+#   - bash <(curl -s https://codecov.io/bash)

Gemfile

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+source "https://rubygems.org"
+
+gem "rake"
+gem "xcpretty"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    rake (10.4.2)
+    rouge (1.10.1)
+    xcpretty (0.2.2)
+      rouge (~> 1.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rake
+  xcpretty
+
+BUNDLED WITH
+   1.11.2

Rakefile

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+def type
+  :project # set `:project` for xcodeproj and `:workspace` for xcworkspace
+end
+
+def project_name
+  "Charts/Charts.xcodeproj"
+end
+
+def configuration
+  "Debug"
+end
+
+def test_targets
+  [
+    :ios,
+    # :tvos #no tvOS fbsnapshot
+  ]
+end
+
+def schemes
+  {
+    ios: 'Charts-iOS',
+    tvos: 'Charts-TV'
+  }
+end
+
+def sdks
+  {
+    ios: 'iphonesimulator',
+    osx: 'macosx',
+    tvos: 'appletvsimulator'
+  }
+end
+
+def devices
+  {
+    ios: "name='iPhone 6s'",
+    osx: "arch='x86_64'",
+    tvos: "name='Apple TV 1080p'"
+  }
+end
+
+def xcodebuild(type, name, scheme, configuration, sdk, destination, tasks, xcprety_args: '')
+
+  # set either workspace or project flag for xcodebuild
+  case type
+  when :project
+    project_type = "-project"
+  when :workspace
+    project_type = "-workspace"
+  else
+    abort "Invalid project type, use `:project` for xcodeproj and `:workspace` for xcworkspace."
+  end
+
+  sh "set -o pipefail && xcodebuild #{project_type} '#{name}' -scheme '#{scheme}' -configuration '#{configuration}' -sdk #{sdk} -destination #{destination} #{tasks} | xcpretty -c #{xcprety_args}"
+
+end
+
+def execute(tasks, platform, xcprety_args)
+
+  # platform specific settings
+  sdk = sdks[platform]
+  scheme = schemes[platform]
+  destination = devices[platform]
+
+  # check if xcodebuild needs to be run on multiple devices
+  if destination.respond_to?('map')
+    destination.map do |destination|
+      xcodebuild type, project_name, scheme, configuration, sdk, destination, tasks, xcprety_args
+    end
+  else
+    xcodebuild type, project_name, scheme, configuration, sdk, destination, tasks, xcprety_args
+  end
+
+end
+
+desc 'Build, then run tests.'
+task :test do
+
+  test_targets.map do |platform|
+    execute 'build test', platform, xcprety_args: '--test'
+  end
+
+  sh "killall Simulator"
+
+end