The test code says Assertion Error: 404! = 200, but it is displayed. Which is wrong?

An error of AssertionError: 404! = 200 occurs in the test code. When actually starting and accessing, the character (haaaaaaa) is displayed and the title is changed to kaaa.
However, it didn’t work perfectly and I failed to give css. I don’t know if these two phenomena are the same cause. I want to know the cause.

test code

    def test_testtem_view(self):
        response = self.client.get(self.test_tem_url)
        self.assertEqual(response.status_code, 200)
        self.assertTemplateUsed(response, 'test_tem2.html')

view code + html

def test_tem(request):
    return render(request,'test_tem2.html',my_dict)
<!DOCTYPE html>
<html lang="en">
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">

Code that adapts css for the time being This should not be wrong

<link rel="stylesheet" href="{% static 'css/test_tem.css' %}">
Invalid block tag on line 8: 'static'. Did you forget to register or load this tag?