Fix a test for HTTPUnauthorized with a Unicode string body argument

[paulefoe]

What do these changes do?

Allows previous behavior when constructing HTTPUnauthorized with a body argument as a string

Are there changes in behavior for the user?

Users are now able to send HTTPUnauthorized response with a string

#5657

This commit fixes #5657

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
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[paulefoe]

I'm not sure how to fix mypy here, should I move value property to StringPayload and say that it returns str?

[webknjaz]

Could you explain this bit? I expected the fix to be in the exception initializer.

[paulefoe]

Now that I look at it, I think that the test is wrong and everything works correctly on 3.8.

The reason is, on master, the response from HTTPUnauthorized uses exc.text which I tested here, but in 3.8 it's not used, the response forms without using the text property of exception.

I'll look tomorrow if the test can be rewritten or should be deleted entirely.

[paulefoe]

I think I should remove the last line for the test, where it access text test just the initialization and status, or maybe just the initialization.

def test_unicode_text_body_unauthorized() -> None:
    """
    Test that HTTPUnauthorized can be initialized with a string.
    """
    with pytest.warns(
        DeprecationWarning, match="body argument is deprecated for http web exceptions"
    ):
        resp = web.HTTPUnauthorized(body="text")
    assert resp.status == 401