Fix #2 - Add support for Windows

lib/guard/phpunit/runner.rb

@@ -1,3 +1,4 @@
+require 'rbconfig'
 require 'tmpdir'
 require 'fileutils'
 
@@ -46,7 +47,13 @@ def run(paths, options = {})
         # @return [Boolean] The status of phpunit
         #
         def phpunit_exists?
-          system('which phpunit > /dev/null 2>&1')
+          command = if RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/
+            'where phpunit > nul 2>&1'
+          else
+            'which phpunit > /dev/null 2>&1'
+          end
+
+          system(command)
         end
 
         # Executes the testing command on the tests

spec/guard/phpunit/runner_spec.rb

@@ -15,7 +15,7 @@
       subject.stub(:phpunit_exists?).and_return(true)
       notifier.stub(:notify_results)
 
-      system("`exit 0`") # prime the $? variable
+      system("exit 0") # prime the $? variable
     end
 
     context 'when passed an empty paths list' do
@@ -80,7 +80,7 @@
         end
 
         it 'notifies about the tests output even when they contain failures' do
-          system("`exit 1`") # prime the $? variable
+          system("exit 1") # prime the $? variable
           output = load_phpunit_output('failing')
           subject.stub(:execute_command).and_return(output)
           subject.should_receive(:notify_results).with(output, anything())
@@ -89,7 +89,7 @@
         end
 
         it 'notifies about the tests output even when they contain errors' do
-          system("`exit 2`") # prime the $? variable
+          system("exit 2") # prime the $? variable
           output = load_phpunit_output('errors')
           subject.stub(:execute_command).and_return(output)
           subject.should_receive(:notify_results).with(output, anything())
@@ -106,7 +106,7 @@
 
       context 'when PHPUnit fails to execute' do
         before do
-          system("`exit 255`") # prime the $? variable
+          system("exit 255") # prime the $? variable
           notifier.stub(:notify)
         end