output all syntax errors at once

spec/wpscan_spec.rb

@@ -27,10 +27,12 @@ describe 'wpscan main checks' do
   end
 
   it 'should check for valid syntax' do
+    result = ""
     Dir.glob("**/*.rb") do |file|
       res = %x{ruby -c #{ROOT_DIR}/#{file} 2>&1}.split("\n")
       ok = res.select {|msg| msg =~ /Syntax OK/}
-      fail("Syntax error in #{file}:\n" + res.join("\n")) if ok.size != 1
+      result << ("####################\nSyntax error in #{file}:\n#{res.join("\n").strip()}\n") if ok.size != 1
     end
+    fail(result) unless result.empty?
   end
 end