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Test: a failed submit keeps the selection #16

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Merged
thorwhalen merged 1 commit into from
Oct 13, 2026
Merged

Test: a failed submit keeps the selection #16

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10 changes: 7 additions & 3 deletions tests/test_file_uploader_clear.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@
from streamlitfront.elements import FileUploader, MultiSourceInput, TextOutput

def count_bytes(data: list) -> int:
if not data:
if not data or not sum(len(f.getvalue()) for f in data):
raise ValueError("no data")
st.info("drawn by the function")
return sum(len(f.getvalue()) for f in data)
Expand Down Expand Up @@ -87,9 +87,13 @@ def test_clear_after_submit_false_keeps_the_selection():


def test_failed_submit_keeps_the_selection():
"""The function raises on empty data; nothing was submitted, so nothing is cleared."""
"""A submit whose function raises submitted nothing, so nothing is cleared."""
at = _run_app()
at.button[0].click().run()
assert at.exception # ValueError from the function propagates, as before
at.file_uploader[0].upload("a.txt", b"").run()
at = _run_app()
at.file_uploader[0].upload("a.txt", b"").run() # selected, but empty: it raises
assert _names(at) == ["a.txt"]
at.button[0].click().run()
assert at.exception
assert _names(at) == ["a.txt"]
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