Update CI

.travis.yml

@@ -2,6 +2,7 @@ os: osx
 osx_image: xcode10.1
 language: ruby
 before_install:
+  - brew update
   - brew tap simple2d/tap
   - brew install simple2d mruby
 script:

README.md

@@ -1,6 +1,6 @@
 # Welcome to Ruby 2D!
 
-[![Gem](https://img.shields.io/gem/v/ruby2d.svg)](https://rubygems.org/gems/ruby2d) [![Build Status](https://travis-ci.org/ruby2d/ruby2d.svg?branch=master)](https://travis-ci.org/ruby2d/ruby2d) [![Gitter](https://badges.gitter.im/ruby2d/ruby2d.svg)](https://gitter.im/ruby2d/ruby2d)
+[![Gem](https://img.shields.io/gem/v/ruby2d.svg)](https://rubygems.org/gems/ruby2d) [![Build Status](https://travis-ci.com/ruby2d/ruby2d.svg?branch=master)](https://travis-ci.com/ruby2d/ruby2d) [![Gitter](https://badges.gitter.im/ruby2d/ruby2d.svg)](https://gitter.im/ruby2d/ruby2d)
 
 This is the [Ruby 2D gem](https://rubygems.org/gems/ruby2d). Check out the [Ruby 2D website](http://www.ruby2d.com) to learn how to get started building 2D apps in Ruby.
 

test/music_spec.rb

@@ -2,15 +2,18 @@
 
 RSpec.describe Ruby2D::Music do
 
-  # On AppVeyor:
-  #   Error: (Mix_OpenAudio) WASAPI can't find requested audio endpoint: Element not found.
+  # Audio cannot be opened on CI
+  # On macOS:
+  #   Mix_GetError: CoreAudio error (AudioDeviceGetProperty (kAudioDevicePropertyDeviceIsAlive)): 560947818
+  # On Windows:
+  #   Mix_GetError: WASAPI can't find requested audio endpoint: Element not found.
 
   describe "#new" do
     it "raises exception if audio file doesn't exist" do
       expect { Music.new('no_music_here.mp3') }.to raise_error(Ruby2D::Error)
     end
 
-    unless ENV['APPVEYOR']
+    unless ENV['CI']
       it "creates music with options" do
         mus = Music.new('test/media/music.mp3', loop: true)
         expect(mus.path).to eq('test/media/music.mp3')
@@ -20,7 +23,7 @@
   end
 
   describe "attributes" do
-    unless ENV['APPVEYOR']
+    unless ENV['CI']
       it "can be set and read" do
         mus = Music.new('test/media/music.mp3')
         expect(mus.loop).to be false
@@ -31,7 +34,7 @@
   end
 
   describe "#volume" do
-    unless ENV['APPVEYOR']
+    unless ENV['CI']
       it "sets the volume on music instances" do
         mus = Music.new('test/media/music.mp3')
         expect(mus.volume).to eq(100)

test/sound_spec.rb

@@ -7,7 +7,7 @@
       expect { Sound.new("no_sound_here.wav") }.to raise_error(Ruby2D::Error)
     end
 
-    unless ENV['APPVEYOR']
+    unless ENV['CI']  # audio cannot be opened on CI; see `music_spec.rb`
       it "creates sound" do
         snd = Sound.new('test/media/sound.wav')
         expect(snd.path).to eq('test/media/sound.wav')