diff --git a/django/core/servers/basehttp.py b/django/core/servers/basehttp.py
index 090a694c3e..8b03e9bb4d 100644
--- a/django/core/servers/basehttp.py
+++ b/django/core/servers/basehttp.py
@@ -9,10 +9,8 @@ been reviewed for security issues. DON'T USE IT FOR PRODUCTION USE!
 
 from __future__ import unicode_literals
 
-from io import BytesIO
 import socket
 import sys
-import traceback
 from wsgiref import simple_server
 from wsgiref.util import FileWrapper   # NOQA: for backwards compatibility
 
@@ -23,13 +21,7 @@ from django.utils import six
 from django.utils.module_loading import import_string
 from django.utils.six.moves import socketserver
 
-__all__ = ('WSGIServer', 'WSGIRequestHandler', 'MAX_SOCKET_CHUNK_SIZE')
-
-
-# If data is too large, socket will choke, so write chunks no larger than 32MB
-# at a time. The rationale behind the 32MB can be found on Django's Trac:
-# https://code.djangoproject.com/ticket/5596#comment:4
-MAX_SOCKET_CHUNK_SIZE = 32 * 1024 * 1024  # 32 MB
+__all__ = ('WSGIServer', 'WSGIRequestHandler')
 
 
 def get_internal_wsgi_application():
@@ -66,46 +58,6 @@ def get_internal_wsgi_application():
                     sys.exc_info()[2])
 
 
-class ServerHandler(simple_server.ServerHandler, object):
-    error_status = str("500 INTERNAL SERVER ERROR")
-
-    def write(self, data):
-        """'write()' callable as specified by PEP 3333"""
-
-        assert isinstance(data, bytes), "write() argument must be bytestring"
-
-        if not self.status:
-            raise AssertionError("write() before start_response()")
-
-        elif not self.headers_sent:
-            # Before the first output, send the stored headers
-            self.bytes_sent = len(data)    # make sure we know content-length
-            self.send_headers()
-        else:
-            self.bytes_sent += len(data)
-
-        # XXX check Content-Length and truncate if too many bytes written?
-        data = BytesIO(data)
-        for chunk in iter(lambda: data.read(MAX_SOCKET_CHUNK_SIZE), b''):
-            self._write(chunk)
-            self._flush()
-
-    def error_output(self, environ, start_response):
-        super(ServerHandler, self).error_output(environ, start_response)
-        return ['\n'.join(traceback.format_exception(*sys.exc_info()))]
-
-    # Backport of http://hg.python.org/cpython/rev/d5af1b235dab. See #16241.
-    # This can be removed when support for Python <= 2.7.3 is deprecated.
-    def finish_response(self):
-        try:
-            if not self.result_is_file() or not self.sendfile():
-                for data in self.result:
-                    self.write(data)
-                self.finish_content()
-        finally:
-            self.close()
-
-
 class WSGIServer(simple_server.WSGIServer, object):
     """BaseHTTPServer that implements the Python WSGI protocol"""
 
diff --git a/tests/builtin_server/tests.py b/tests/builtin_server/tests.py
index ef215ccf97..2bfdfac66b 100644
--- a/tests/builtin_server/tests.py
+++ b/tests/builtin_server/tests.py
@@ -1,9 +1,56 @@
 from __future__ import unicode_literals
 
 from io import BytesIO
+import sys
+import traceback
 from unittest import TestCase
+from wsgiref import simple_server
 
-from django.core.servers.basehttp import ServerHandler, MAX_SOCKET_CHUNK_SIZE
+
+# If data is too large, socket will choke, so write chunks no larger than 32MB
+# at a time. The rationale behind the 32MB can be found on Django's Trac:
+# https://code.djangoproject.com/ticket/5596#comment:4
+MAX_SOCKET_CHUNK_SIZE = 32 * 1024 * 1024  # 32 MB
+
+
+class ServerHandler(simple_server.ServerHandler, object):
+    error_status = str("500 INTERNAL SERVER ERROR")
+
+    def write(self, data):
+        """'write()' callable as specified by PEP 3333"""
+
+        assert isinstance(data, bytes), "write() argument must be bytestring"
+
+        if not self.status:
+            raise AssertionError("write() before start_response()")
+
+        elif not self.headers_sent:
+            # Before the first output, send the stored headers
+            self.bytes_sent = len(data)    # make sure we know content-length
+            self.send_headers()
+        else:
+            self.bytes_sent += len(data)
+
+        # XXX check Content-Length and truncate if too many bytes written?
+        data = BytesIO(data)
+        for chunk in iter(lambda: data.read(MAX_SOCKET_CHUNK_SIZE), b''):
+            self._write(chunk)
+            self._flush()
+
+    def error_output(self, environ, start_response):
+        super(ServerHandler, self).error_output(environ, start_response)
+        return ['\n'.join(traceback.format_exception(*sys.exc_info()))]
+
+    # Backport of http://hg.python.org/cpython/rev/d5af1b235dab. See #16241.
+    # This can be removed when support for Python <= 2.7.3 is deprecated.
+    def finish_response(self):
+        try:
+            if not self.result_is_file() or not self.sendfile():
+                for data in self.result:
+                    self.write(data)
+                self.finish_content()
+        finally:
+            self.close()
 
 
 class DummyHandler(object):