Tests: added more expected Ruby features.

test/ruby/multipart/config.ru

@@ -0,0 +1,7 @@
+app = Proc.new do |env|
+    [200, {
+        'x-multipart-buffer' => env['rack.multipart.buffer_size'].to_s
+    }, []]
+end
+
+run app

test/ruby/session/config.ru

@@ -0,0 +1,6 @@
+app = Proc.new do |env|
+    env['rack.session'].clear
+    [200, {}, []]
+end
+
+run app

test/test_ruby_application.py

@@ -315,6 +315,20 @@ def test_ruby_application_header_rack():
     assert client.get()['status'] == 500, 'header rack'
 
 
+@pytest.mark.skip('not yet')
+def test_ruby_application_session():
+    client.load('session')
+
+    assert client.get()['status'] == 200
+
+
+@pytest.mark.skip('not yet')
+def test_ruby_application_multipart():
+    client.load('multipart')
+
+    assert client.get()['status'] == 200
+
+
 def test_ruby_application_body_empty():
     client.load('body_empty')