Why my testing function in the Django returns status code 404 while in chrome browser the page shows correctly?

I am a Django novice and I am trying to proceed with a simple application testing. One of my tests fails but I cannot find the reason why. I added several prints to clear what was going on.

The test function that fails is:

def test_board_topics_view_contains_navigation_links(self):
        board_topics_url = reverse('board_topics', kwargs={'pk': 1})
        print("49: board_topic = " + board_topics_url)
        homepage_url = reverse('home')
        print("51: homepage_url = " + homepage_url)
        new_topic_url = reverse('new_topic', kwargs={'pk': 1})
        print("53: new_topic_url = " + new_topic_url)
        response = self.client.get(board_topics_url)
        print("*****************\n")
        print(response)
        print('********************\n')
        self.assertContains(response, 'href="{0}"'.format(homepage_url))
        self.assertContains(response, 'href="{0}"'.format(new_topic_url))

Then I can see the output:

Creating test database for alias 'default'...
System check identified no issues (0 silenced).
.49: board_topic = /boards/1/
51: homepage_url = /
53: new_topic_url = /boards/1/new/
*****************

<HttpResponseNotFound status_code=404, "text/html">
********************

It looks like board_topics_url is not working. But in my chrome explorer it works very good and returns a page with both links homepage_url = '/' and new_topic_url = '/boards/1/new/':

 ...      
  <li class="breadcrumb-item"><a href="/">Boards</a></li>
  <li class="breadcrumb-item active">Django</li>
      </ol>

    <div class="mb-4">
        <a href="/boards/1/new/" class="btn btn-primary">New topic</a>
    </div>
...

Both links are working correctly.

Please, any idea what could be wrong? Thank you very much for any help.