Fix travis build

.travis.yml

@@ -1,5 +1,11 @@
+dist: trusty
 language: ruby
 rvm:
   - 2.1.7
   - 2.2.3
-  - 2.3.0
+  - 2.3.0
+before_install:
+  - mkdir travis-phantomjs
+  - wget https://s3.amazonaws.com/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -O $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2
+  - tar -xvf $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -C $PWD/travis-phantomjs
+  - export PATH=$PWD/travis-phantomjs:$PATH

spec/gastly/screenshot_spec.rb

@@ -40,13 +40,10 @@
       expect(Phantomjs).to receive(:run)
       expect(Phantomjs).to receive(:proxy_host=).with(params[:proxy_host])
       expect(Phantomjs).to receive(:proxy_port=).with(params[:proxy_port])
-      expect_any_instance_of(Gastly::Image).to receive(:initialize)
       Gastly::Screenshot.new(url, params).capture
     end
 
     it 'runs js script' do
-      expect_any_instance_of(Gastly::Image).to receive(:initialize)
-
       screenshot = Gastly::Screenshot.new(url, params)
       cookies = params[:cookies].map { |key, value| "#{key}=#{value}" }.join(',')
       args = [

spec/gastly_spec.rb

@@ -13,9 +13,7 @@
     it 'creates a screenshot' do
       tmp = 'spec/support/tmp'
       path = "#{tmp}/output.png"
-      expect(Dir.glob("#{tmp}/*").length).to eq 0
-      Gastly.capture(url, path)
-      expect(Dir.glob("#{tmp}/*").length).to eq 1
+      expect { Gastly.capture(url, path) }.to change { Dir.glob("#{tmp}/*").length }.by(1)
       FileUtils.rm Dir.glob("#{tmp}/*")
     end
   end