add ruby httpx echo api tests (#16729)

samples/client/echo_api/ruby-httpx/spec/configuration_spec.rb

@@ -0,0 +1,75 @@
+=begin
+#Echo Server API
+
+#Echo Server API
+
+The version of the OpenAPI document: 0.1.0
+Contact: team@openapitools.org
+Generated by: https://openapi-generator.tech
+OpenAPI Generator version: 7.1.0-SNAPSHOT
+
+=end
+
+require 'spec_helper'
+
+describe OpenapiClient::Configuration do
+  let(:config) { OpenapiClient::Configuration.default }
+
+  before(:each) do
+    # uncomment below to setup host and base_path
+    # require 'URI'
+    # uri = URI.parse("http://localhost:3000")
+    # OpenapiClient.configure do |c|
+    #   c.host = uri.host
+    #   c.base_path = uri.path
+    # end
+  end
+
+  describe '#base_url' do
+    it 'should have the default value' do
+      # uncomment below to test default value of the base path
+      # expect(config.base_url).to eq("http://localhost:3000")
+    end
+
+    it 'should remove trailing slashes' do
+      [nil, '', '/', '//'].each do |base_path|
+        config.base_path = base_path
+        # uncomment below to test trailing slashes
+        # expect(config.base_url).to eq("http://localhost:3000")
+      end
+    end
+  end
+
+  describe '#configure' do
+    let(:session) { HTTPX::Session.new }
+
+    before do
+      module CustomPlugin
+        module InstanceMethods; end
+      end
+      module AnotherCustomPlugin
+        module InstanceMethods; end
+      end
+
+      config.configure_session do |session|
+        session.plugin(CustomPlugin)
+      end
+    end
+
+    it 'adds a block that will be used to configure the connection' do
+      sess = config.configure(session)
+
+      expect(sess.class.ancestors).to include(CustomPlugin::InstanceMethods)
+    end
+
+    it 'supports multiple configuration blocks' do
+      config.configure_session do |session|
+        session.plugin(AnotherCustomPlugin)
+      end
+      sess = config.configure(session)
+
+      expect(sess.class.ancestors).to include(CustomPlugin::InstanceMethods)
+      expect(sess.class.ancestors).to include(AnotherCustomPlugin::InstanceMethods)
+    end
+  end
+end