bin/calabash-android-build.rb in calabash-android-0.3.0.pre5 vs bin/calabash-android-build.rb in calabash-android-0.3.0.pre6

@@ -8,20 +8,26 @@
   Dir.mktmpdir do |workspace_dir|
     Dir.chdir(workspace_dir) do
       FileUtils.cp(unsigned_test_apk, "TestServer.apk")
       FileUtils.cp(File.join(File.dirname(__FILE__), '..', 'test-server/AndroidManifest.xml'), "AndroidManifest.xml")
 
-      system  %Q{ruby -pi.bak -e "gsub(/#targetPackage#/, '#{package_name(app)}')" AndroidManifest.xml}
+      unless system  %Q{ruby -pi.bak -e "gsub(/#targetPackage#/, '#{package_name(app)}')" AndroidManifest.xml}
+        raise "Could not replace package name in manifest"
+      end 
       
-      system("#{ENV["ANDROID_HOME"]}/platform-tools/aapt package -M AndroidManifest.xml  -I #{android_platform}/android.jar -F dummy.apk")
-
+      unless system("#{ENV["ANDROID_HOME"]}/platform-tools/aapt package -M AndroidManifest.xml  -I #{android_platform}/android.jar -F dummy.apk")
+        raise "Could not create dummy.apk"
+      end 
+      
       Zip::ZipFile.new("dummy.apk").extract("AndroidManifest.xml","customAndroidManifest.xml")
       Zip::ZipFile.open("TestServer.apk") do |zip_file|
         zip_file.add("AndroidManifest.xml", "customAndroidManifest.xml")  
       end
     end
     cmd = "jarsigner -sigalg MD5withRSA -digestalg SHA1 -signedjar #{test_server_file_name} -storepass #{keystore["keystore_password"]} -keystore \"#{File.expand_path keystore["keystore_location"]}\" #{workspace_dir}/TestServer.apk #{keystore["keystore_alias"]}"
-    system(cmd)
+    unless system(cmd)
+      raise "Could not sign test server"
+    end
   end
   puts "Done signing the test server. Moved it to #{test_server_file_name}"
 end
 
 
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