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import pyglet
def test_incrementallayout_get_position_on_line_before_start_of_text():
single_line_text = "This is a single line of text."
document = pyglet.text.document.UnformattedDocument(single_line_text)
font = document.get_font()
layout = pyglet.text.layout.IncrementalTextLayout(document,
height = font.ascent - font.descent,
width = 200,
multiline=False)
layout.x = 100
layout.y = 100
assert layout.get_position_on_line(0, 100) == 0
assert layout.get_position_on_line(0, 90) == 0
assert layout.get_position_on_line(0, 80) == 0
assert layout.get_position_on_line(0, 70) == 0
assert layout.get_position_on_line(0, 60) == 0
assert layout.get_position_on_line(0, 50) == 0
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