get the tests work with latest jruby-maven-plugins SNAPSHOT

Gemfile

@@ -1,2 +1,7 @@
 source :rubygems
 gemspec
+
+group :test do
+  gem 'minitest', '~> 2.10.0'
+  gem 'cucumber', '~> 1.1.9'
+end

Mavenfile

@@ -18,6 +18,7 @@ jar 'org.apache.maven.wagon:wagon-http-lightweight', wagon_version
 JRUBY_VERSIONS = ['1.5.6','1.6.5.1','1.6.7'].join(',')
 plugin(:minitest) do |m|
   m.gem(:minitest, '2.10.0')
+  m.gem(:bundler, '1.1.3')
   m.execute_goal(:spec)
   m.with :use18and19 => true, :versions => JRUBY_VERSIONS
 end
@@ -29,4 +30,7 @@ plugin(:cucumber) do |m|
   m.with :use18and19 => true, :versions => JRUBY_VERSIONS
 end
 
+# hack until test profile deps are normal deps with scope 'test'
+profile(:test).activation.by_default
+
 # vim: syntax=Ruby

lib/jbundler.rb

@@ -9,7 +9,7 @@
 classpath_file = JBundler::ClasspathFile.new('.jbundler/classpath.rb')
 gemfile_lock = JBundler::GemfileLock.new(mavenfile, config.gemfile + '.lock')
 
-if classpath_file.needs_update?(mavenfile, gemfile_lock)
+if mavenfile.exists? && classpath_file.needs_update?(mavenfile, gemfile_lock)
   aether = JBundler::AetherRuby.new(config)
 
   mavenfile.populate_unlocked(aether)