Change this test yet again to not rely on ps, and make it allow up to a second for the executable to be called.

.gitignore

@@ -1 +1,2 @@
 /Gemfile.lock
+/spec/support/custom_phantomjs_called

spec/integration/driver_spec.rb

@@ -12,11 +12,23 @@ describe Capybara::Poltergeist::Driver do
   it_should_behave_like "driver with cookies support"
 
   it 'should support a custom phantomjs path' do
-    path = File.expand_path('../../support/custom_phantomjs', __FILE__)
+    file = File.expand_path('../../support/custom_phantomjs_called', __FILE__)
+    path = File.expand_path('../../support/custom_phantomjs',        __FILE__)
+
+    FileUtils.rm_f file
 
     driver  = Capybara::Poltergeist::Driver.new(nil, :phantomjs => path)
     driver.browser
 
-    `ps -o command=`.should include(path)
+    # If the correct custom path is called, it will touch the file. We allow at
+    # least 1 sec for this to happen before failing.
+
+    tries = 0
+    until File.exist?(file) || tries == 10
+      sleep 0.1
+      tries += 1
+    end
+
+    File.exist?(file).should == true
   end
 end

spec/support/custom_phantomjs

@@ -1,2 +1,3 @@
 #!/bin/bash
+touch `dirname "$0"`/custom_phantomjs_called
 phantomjs "$@"