yeah, it's working

Gemfile

@@ -2,3 +2,6 @@ source "http://rubygems.org"
 
 # Specify your gem's dependencies in guard-jasmine-headless-webkit.gemspec
 gemspec
+gem 'guard'
+gem 'rspec'
+gem 'mocha'

Guardfile

@@ -0,0 +1,17 @@
+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+guard 'rspec', :version => 2 do
+  watch(%r{^spec/.+_spec\.rb})
+  watch(%r{^lib/(.+)\.rb})     { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb') { "spec" }
+
+  # Rails example
+  watch('spec/spec_helper.rb')                       { "spec" }
+  watch('config/routes.rb')                          { "spec/routing" }
+  watch('app/controllers/application_controller.rb') { "spec/controllers" }
+  watch(%r{^spec/.+_spec\.rb})
+  watch(%r{^app/(.+)\.rb})                           { |m| "spec/#{m[1]}_spec.rb" }
+  watch(%r{^lib/(.+)\.rb})                           { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch(%r{^app/controllers/(.+)_(controller)\.rb})  { |m| ["spec/routing/#{m[1]}_routing_spec.rb", "spec/#{m[2]}s/#{m[1]}_#{m[2]}_spec.rb", "spec/acceptance/#{m[1]}_spec.rb"] }
+end

guard-jasmine-headless-webkit.gemspec

@@ -4,7 +4,7 @@ require "guard/jasmine-headless-webkit/version"
 
 Gem::Specification.new do |s|
   s.name        = "guard-jasmine-headless-webkit"
-  s.version     = Guard::JasmineHeadlessWebkit::VERSION
+  s.version     = Guard::JasmineHeadlessWebkitVersion::VERSION
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["John Bintz"]
   s.email       = ["john@coswellproductions.com"]

lib/guard/jasmine-headless-webkit.rb

@@ -1,5 +1,6 @@
 require 'guard'
 require 'guard/guard'
+require 'guard/jasmine-headless-webkit/runner'
 
 module Guard
   class JasmineHeadlessWebkit < Guard
@@ -16,13 +17,11 @@ module Guard
     end
 
     def run_all
-      system %{jasmine-headless-webkit}
+      JasmineHeadlessWebkitRunner.run
     end
 
     def run_on_change(paths)
-      system %{jasmine-headless-webkit #{paths.join(" ")}}
-
-      run_all if $?.exitstatus != 1
+      run_all if JasmineHeadlessWebkitRunner.run(paths) != 1
     end
   end
 

lib/guard/jasmine-headless-webkit/runner.rb

@@ -0,0 +1,11 @@
+module Guard
+  class JasmineHeadlessWebkitRunner
+    class << self
+      def run(paths = [])
+        system %{jasmine-headless-webkit #{paths.join(" ")}}
+        $?.exitstatus
+      end
+    end
+  end
+end
+

lib/guard/jasmine-headless-webkit/templates/Guardfile

@@ -0,0 +1,9 @@
+# Run JS and CoffeeScript files in a typical Rails 3.1 fashion, placing Underscore templates in app/views/*.jst
+
+guard 'jasmine-headless-webkit' do
+  watch(%r{^app/views/.*\.jst})
+  watch(%r{^public/javascripts/(.*)\.js}) { |m| newest_js_file("spec/javascripts/#{m[1]}") }
+  watch(%r{^app/assets/javascripts/(.*)\.(js|coffee)}) { |m| newest_js_file("spec/javascripts/#{m[1]}") }
+  watch(%r{^spec/javascripts/(.*)_spec\..*}) { |m| newest_js_file("spec/javascripts/#{m[1]}") }
+end
+

lib/guard/jasmine-headless-webkit/version.rb

@@ -1,5 +1,5 @@
 module Guard
-  module JasmineHeadlessWebkit
+  module JasmineHeadlessWebkitVersion
     VERSION = "0.0.1"
   end
 end

spec/lib/guard/jasmine-headless-webkit_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+require 'guard/jasmine-headless-webkit'
+
+describe Guard::JasmineHeadlessWebkit do
+  let(:guard) { Guard::JasmineHeadlessWebkit.new([], options) }
+
+  let(:options) { {} }
+
+  describe "#start" do
+    context 'no all on start' do
+      let(:options) { { :all_on_start => false } }
+
+      it "should not run all" do
+        guard.expects(:run_all).never
+        guard.start
+      end
+    end
+
+    context 'all on start' do
+      let(:options) { { :all_on_start => true } }
+
+      it "should not run all" do
+        guard.expects(:run_all).once
+        guard.start
+      end
+    end
+  end
+
+  describe '#run_on_change' do
+    context 'jhw call fails' do
+      it "should not run all" do
+        Guard::JasmineHeadlessWebkitRunner.expects(:run).returns(1)
+        guard.expects(:run_all).never
+
+        guard.run_on_change(%w{test})
+      end
+    end
+
+    context 'succeed, run all' do
+      it "should run all" do
+        Guard::JasmineHeadlessWebkitRunner.expects(:run).returns(0)
+        guard.expects(:run_all).once
+
+        guard.run_on_change(%w{test})
+      end
+    end
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1,16 @@
+require 'mocha'
+require 'guard'
+
+RSpec.configure do |config|
+  config.mock_with :mocha
+end
+
+module Guard
+  module UI
+    class << self
+      def info(*args)
+      end
+    end
+  end
+end
+