Django测试url老是返回404，用浏览器浏览url就正常，这是怎么回事？

from django.test import TestCase

# Create your tests here.



class SendviewsTestCase(TestCase):



    def test_get_data(self):

        rep = self.client.post('/data/datamsg/',{'data_name':'测试数据'})

        print (rep.content)

        # 测试http请求的返回码是否正确

        self.assertEqual(rep.status_code,200)

======================================================================

FAIL: test_get_data (dataforpro.tests.SendviewsTestCase)

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Traceback (most recent call last):

  File "/home/yangtz/developproject/backend/dataforpro/tests.py", line 20, in test_get_data

    self.assertEqual(rep.status_code,200)

AssertionError: 404 != 200



----------------------------------------------------------------------

Ran 1 test in 0.017s



FAILED (failures=1)

Destroying test database for alias 'default'...