[aws|iam] raise correct ValidationError when an empty cert or key is used

lib/fog/aws/iam.rb

@@ -6,6 +6,7 @@ module Fog
       class KeyPairMismatch < Fog::AWS::IAM::Error; end
       class LimitExceeded < Fog::AWS::IAM::Error; end
       class MalformedCertificate < Fog::AWS::IAM::Error; end
+      class ValidationError < Fog::AWS::IAM::Error; end
 
       requires :aws_access_key_id, :aws_secret_access_key
       recognizes :host, :path, :port, :scheme, :persistent
@@ -163,6 +164,8 @@ module Fog
                 raise Fog::AWS::IAM::LimitExceeded.slurp(error, match[2])
               when 'MalformedCertificate'
                 raise Fog::AWS::IAM::MalformedCertificate.slurp(error, match[2])
+              when 'ValidationError'
+                raise Fog::AWS::IAM::ValidationError.slurp(error, match[2])
               else
                 raise Fog::AWS::IAM::Error.slurp(error, "#{match[1]} => #{match[2]}") if match[1]
                 raise

lib/fog/aws/requests/iam/upload_server_certificate.rb

@@ -44,6 +44,9 @@ module Fog
 
       class Mock
         def upload_server_certificate(certificate, private_key, name, options = {})
+          if certificate.nil? || certificate.empty? || private_key.nil? || private_key.empty?
+            raise Fog::AWS::IAM::ValidationError.new
+          end
           response = Excon::Response.new
 
           if self.data[:server_certificates][name]

tests/aws/requests/iam/server_certificate_tests.rb

@@ -13,11 +13,22 @@ Shindo.tests('AWS::IAM | server certificate requests', ['aws']) do
     'RequestId' => String
   }
 
-  tests('#upload_server_certificate').formats(@upload_format) do
+  tests('#upload_server_certificate') do
     public_key  = AWS::IAM::SERVER_CERT_PUBLIC_KEY
     private_key = AWS::IAM::SERVER_CERT_PRIVATE_KEY
+
+    tests('empty public key').raises(Fog::AWS::IAM::ValidationError) do
+      AWS[:iam].upload_server_certificate('', private_key, @key_name).body
+    end
+
+    tests('empty private key').raises(Fog::AWS::IAM::ValidationError) do
+      AWS[:iam].upload_server_certificate(public_key, '', @key_name).body
+    end
+
+    tests('format').formats(@upload_format) do
       AWS[:iam].upload_server_certificate(public_key, private_key, @key_name).body
     end
+  end
 
   tests('#get_server_certificate').formats(@upload_format) do
     tests('raises NotFound').raises(Fog::AWS::IAM::NotFound) do