Merge pull request #21 from trotzig/rspec

Rspec

.travis.yml

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+language: ruby
+rvm:
+  - "2.2.1"
+
+script: bash headless_rspec.sh
+install: gem install rspec headless; bundle install;
+before_install:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"

Gemfile

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+source 'https://rubygems.org'
+gemspec

headless_rspec.sh

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+ruby <<RUBY
+  require 'headless'
+  exit(Headless.ly { system('rspec') ? 0 : 1 })
+RUBY

spec/likadan_spec.rb

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+require 'yaml'
+require 'tmpdir'
+
+describe 'likadan' do
+  let(:config) do
+    {
+      'source_files' => ['examples.js']
+    }
+  end
+
+  let(:example_config) { '{}' }
+
+  let(:examples_js) { <<-EOS }
+    likadan.define('foo', function() {
+      var elem = document.createElement('div');
+      elem.innerHTML = 'Foo';
+      document.body.appendChild(elem);
+      return elem;
+    }, #{example_config})
+  EOS
+
+  before do
+    @tmp_dir = Dir.mktmpdir
+
+    File.open(File.join(@tmp_dir, '.likadan.yaml'), 'w') do |f|
+      f.write(config.to_yaml)
+    end
+
+    File.open(File.join(@tmp_dir, 'examples.js'), 'w') do |f|
+      f.write(examples_js)
+    end
+  end
+
+  after do
+    FileUtils.remove_entry_secure @tmp_dir
+  end
+
+  def run_likadan
+    pwd = Dir.pwd
+    Dir.chdir @tmp_dir do
+      system("ruby -I#{pwd}/lib #{pwd}/bin/likadan")
+    end
+  end
+
+  describe 'with no previous run' do
+    it 'generates a baseline' do
+      run_likadan
+      expect(
+        File.exist?(
+          File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'baseline.png')
+        )
+      ).to be(true)
+    end
+
+    it 'does not generate a diff' do
+      run_likadan
+      expect(
+        File.exist?(
+          File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'diff.png')
+        )
+      ).to be(false)
+    end
+
+    it 'does not create a candidate file' do
+      run_likadan
+      expect(
+        File.exist?(
+          File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'candidate.png')
+        )
+      ).to be(false)
+    end
+  end
+
+  describe 'with a previous run' do
+    context 'and no diff' do
+      before do
+        run_likadan
+      end
+
+      it 'keeps the baseline' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'baseline.png')
+          )
+        ).to be(true)
+      end
+
+      it 'does not generate a diff' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'diff.png')
+          )
+        ).to be(false)
+      end
+
+      it 'does not create a candidate file' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'candidate.png')
+          )
+        ).to be(false)
+      end
+    end
+
+    context 'and there is a diff' do
+      before do
+        run_likadan
+
+        File.open(File.join(@tmp_dir, 'examples.js'), 'w') do |f|
+          f.write(<<-EOS)
+            likadan.define('foo', function() {
+              var elem = document.createElement('div');
+              elem.innerHTML = 'Football';
+              document.body.appendChild(elem);
+              return elem;
+            }, #{example_config})
+          EOS
+        end
+      end
+
+      it 'keeps the baseline' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'baseline.png')
+          )
+        ).to be(true)
+      end
+
+      it 'generates a diff' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'diff.png')
+          )
+        ).to be(true)
+      end
+
+      it 'generates a candidate file' do
+        run_likadan
+        expect(
+          File.exist?(
+            File.join(@tmp_dir, 'snapshots', 'foo', '@large', 'candidate.png')
+          )
+        ).to be(true)
+      end
+    end
+  end
+end