Tests: added Ruby threading tests.

test/ruby/threads/config.ru

@@ -0,0 +1,13 @@
+app = Proc.new do |env|
+    delay = env['HTTP_X_DELAY'].to_f
+
+    sleep(delay)
+
+    ['200', {
+        'Content-Length' => 0.to_s,
+        'Rack-Multithread' => env['rack.multithread'].to_s,
+        'X-Thread' => Thread.current.object_id.to_s
+    }, []]
+end
+
+run app

test/test_ruby_application.py

@@ -351,3 +351,44 @@ class TestRubyApplication(TestApplicationRuby):
         assert len(headers['X-Release-Date']) > 0, 'RUBY_RELEASE_DATE'
         assert len(headers['X-Revision']) > 0, 'RUBY_REVISION'
         assert len(headers['X-Version']) > 0, 'RUBY_VERSION'
+
+    def test_ruby_application_threads(self):
+        self.load('threads')
+
+        assert 'success' in self.conf(
+            '4', 'applications/threads/threads'
+        ), 'configure 4 threads'
+
+        socks = []
+
+        for i in range(4):
+            (_, sock) = self.get(
+                headers={
+                    'Host': 'localhost',
+                    'X-Delay': '2',
+                    'Connection': 'close',
+                },
+                no_recv=True,
+                start=True,
+            )
+
+            socks.append(sock)
+
+        threads = set()
+
+        for sock in socks:
+            resp = self.recvall(sock).decode('utf-8')
+
+            self.log_in(resp)
+
+            resp = self._resp_to_dict(resp)
+
+            assert resp['status'] == 200, 'status'
+
+            threads.add(resp['headers']['X-Thread'])
+
+            assert resp['headers']['Rack-Multithread'] == 'true', 'multithread'
+
+            sock.close()
+
+        assert len(socks) == len(threads), 'threads differs'