Add Edge::Options for insiders Edge builds

It allows to configure the following options:

* ms:inPrivate which controls InPrivate browsing mode
* ms:extensionPaths which loads extensions on start
* ms:startPage which specifies default page

Refer to https://docs.microsoft.com/en-us/microsoft-edge/webdriver for
details.

rb/lib/selenium/webdriver/edge.rb

@@ -19,6 +19,7 @@
 
 require 'selenium/webdriver/edge/bridge'
 require 'selenium/webdriver/edge/driver'
+require 'selenium/webdriver/edge/options'
 require 'selenium/webdriver/edge/service'
 
 module Selenium

rb/lib/selenium/webdriver/edge/options.rb

@@ -0,0 +1,77 @@
+# 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.
+
+module Selenium
+  module WebDriver
+    module Edge
+      class Options
+        attr_accessor :in_private, :start_page
+        attr_reader :extension_paths
+
+        #
+        # Create a new Options instance for Edge.
+        #
+        # @example
+        #   options = Selenium::WebDriver::Edge::Options.new(in_private: true)
+        #   driver = Selenium::WebDriver.for :edge, options: options
+        #
+        # @param [Hash] opts the pre-defined options to create the Edge::Options with
+        # @option opts [Boolean] :in_private Start in private mode. Default is false
+        # @option opts [Array<String>] :extension_paths A list of full paths to extensions to install on startup
+        # @option opts [String] :start_page Default page to start with
+        #
+        # @see https://docs.microsoft.com/en-us/microsoft-edge/webdriver
+        #
+
+        def initialize(**opts)
+          @in_private = opts.delete(:in_private) || false
+          @extension_paths = opts.delete(:extension_paths) || []
+          @start_page = opts.delete(:start_page)
+        end
+
+        #
+        # Add an extension by local path.
+        #
+        # @example
+        #   options = Selenium::WebDriver::Edge::Options.new
+        #   options.add_extension_path('C:\path\to\extension')
+        #
+        # @param [String] path The local path to the extension folder
+        #
+
+        def add_extension_path(path)
+          raise Error::WebDriverError, "could not find extension at #{path.inspect}" unless File.directory?(path)
+          @extension_paths << path
+        end
+
+        #
+        # @api private
+        #
+
+        def as_json(*)
+          opts = {}
+
+          opts['ms:inPrivate'] = true if @in_private
+          opts['ms:extensionPaths'] = @extension_paths if @extension_paths.any?
+          opts['ms:startPage'] = @start_page if @start_page
+
+          opts
+        end
+      end # Options
+    end # Edge
+  end # WebDriver
+end # Selenium

rb/spec/unit/selenium/webdriver/edge/options_spec.rb

@@ -0,0 +1,49 @@
+# 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 Edge
+      describe Options do
+        describe '#add_extension path' do
+          it 'adds extension path to the list' do
+            subject.add_extension_path(__dir__)
+            expect(subject.extension_paths).to eq([__dir__])
+          end
+
+          it 'raises error if path is not a directory' do
+            expect { subject.add_extension_path(__FILE__) }.to raise_error(Error::WebDriverError)
+          end
+        end
+
+        describe '#as_json' do
+          it 'returns JSON hash' do
+            options = Options.new(in_private: true, start_page: 'http://seleniumhq.org')
+            options.add_extension_path(__dir__)
+            expect(options.as_json).to eq({
+              'ms:inPrivate' => true,
+              'ms:extensionPaths' => [__dir__],
+              'ms:startPage' => 'http://seleniumhq.org'
+            })
+          end
+        end
+      end # Options
+    end # Edge
+  end # WebDriver
+end # Selenium