diff --git a/tests/rest/client/test_account.py b/tests/rest/client/test_account.py
index 992421ffe2..a85ea994de 100644
--- a/tests/rest/client/test_account.py
+++ b/tests/rest/client/test_account.py
@@ -427,13 +427,23 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
text = None
for part in mail.walk():
if part.get_content_type() == "text/plain":
- text = part.get_payload(decode=True).decode("UTF-8")
+ text = part.get_payload(decode=True)
+ if text is not None:
+ # According to the logic table in `get_payload`, we know that
+ # the result of `get_payload` will be `bytes`, but mypy doesn't
+ # know this and complains. Thus, we assert the type.
+ assert isinstance(text, bytes)
+ text = text.decode("UTF-8")
+
break
if not text:
self.fail("Could not find text portion of email to parse")
- assert text is not None
+ # `text` must be a `str`, after being decoded and determined just above
+ # to not be `None` or an empty `str`.
+ assert isinstance(text, str)
+
match = re.search(r"https://example.com\S+", text)
assert match, "Could not find link in email"
@@ -1209,13 +1219,23 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
text = None
for part in mail.walk():
if part.get_content_type() == "text/plain":
- text = part.get_payload(decode=True).decode("UTF-8")
+ text = part.get_payload(decode=True)
+ if text is not None:
+ # According to the logic table in `get_payload`, we know that
+ # the result of `get_payload` will be `bytes`, but mypy doesn't
+ # know this and complains. Thus, we assert the type.
+ assert isinstance(text, bytes)
+ text = text.decode("UTF-8")
+
break
if not text:
self.fail("Could not find text portion of email to parse")
- assert text is not None
+ # `text` must be a `str`, after being decoded and determined just above
+ # to not be `None` or an empty `str`.
+ assert isinstance(text, str)
+
match = re.search(r"https://example.com\S+", text)
assert match, "Could not find link in email"
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