Lowercase proxy type for W3C payload

rb/lib/selenium/webdriver/remote/w3c/capabilities.rb

@@ -253,7 +253,10 @@ def as_json(*)
               when :platform
                 hash['platform'] = value.to_s.upcase
               when :proxy
-                hash['proxy'] = value.as_json if value
+                if value
+                  hash['proxy'] = value.as_json
+                  hash['proxy']['proxyType'] &&= hash['proxy']['proxyType'].downcase
+                end
               when String, :firefox_binary
                 hash[key.to_s] = value
               when Symbol

rb/spec/unit/selenium/webdriver/remote/w3c/capabilities_spec.rb

@@ -0,0 +1,36 @@
+# encoding: utf-8
+#
+# Licensed to the Software Freedom Conservancy (SFC) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The SFC licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+require File.expand_path('../../../spec_helper', __FILE__)
+
+module Selenium
+  module WebDriver
+    module Remote
+      module W3C
+        describe Capabilities do
+          it 'lower cases proxy' do
+            proxy = Selenium::WebDriver::Proxy.new(http: 'proxy_url')
+            caps = described_class.new(proxy: proxy)
+            expect(caps.as_json['proxy']['proxyType']).to eq('manual')
+          end
+        end
+      end # W3C
+    end # Remote
+  end # WebDriver
+end # Selenium