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"""Test the pypdf.generic._image_inline module."""
from io import BytesIO
from pypdf.generic._image_inline import is_followed_by_binary_data
def test_is_followed_by_binary_data():
# Empty/too short stream.
stream = BytesIO()
assert not is_followed_by_binary_data(stream)
stream = BytesIO(b" q\n")
assert not is_followed_by_binary_data(stream)
# byte < 32 and no whitespace.
stream = BytesIO(b"\x00\x11\x13\x37")
assert is_followed_by_binary_data(stream)
assert stream.read(1) == b"\x00"
assert is_followed_by_binary_data(stream)
assert stream.read(1) == b"\x11"
assert is_followed_by_binary_data(stream)
assert stream.read() == b"\x13\x37"
# byte < 32, but whitespace.
stream = BytesIO(b" q\n")
assert not is_followed_by_binary_data(stream)
# Whitespace only.
stream = BytesIO(b" \n\n\n \n")
assert not is_followed_by_binary_data(stream)
# No `operator_end`.
stream = BytesIO(b"\n\n\n\n\n\n\n\nBT\n")
assert not is_followed_by_binary_data(stream)
# Operator length is <= 3.
stream = BytesIO(b"\n\n\n\n\n\n\nBT\n")
assert not is_followed_by_binary_data(stream)
# Operator length is > 3.
stream = BytesIO(b"\n\n\n\n\nTEST\n")
assert is_followed_by_binary_data(stream)
# Just characters.
stream = BytesIO(b" ABCDEF")
assert is_followed_by_binary_data(stream)
# No `operator_start`.
stream = BytesIO(b"ABCDEFG")
assert is_followed_by_binary_data(stream)
# Name object.
stream = BytesIO(b"/R10 gs\n/R12 cs\n")
assert not is_followed_by_binary_data(stream)
# Numbers.
stream = BytesIO(b"1337 42 m\n")
assert not is_followed_by_binary_data(stream)
stream = BytesIO(b"1234.56 42 13 37 10 20 c\n")
assert not is_followed_by_binary_data(stream)
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