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def test_1(ctx):
buf1 = ctx.buffer(b'abc')
buf2 = ctx.buffer(reserve=3)
ctx.copy_buffer(buf2, buf1)
assert buf2.read() == b'abc'
def test_2(ctx):
buf1 = ctx.buffer(b'abcxyz123')
buf2 = ctx.buffer(reserve=12)
ctx.copy_buffer(buf2, buf1, 3, read_offset=3, write_offset=0)
ctx.copy_buffer(buf2, buf1, 3, read_offset=0, write_offset=3)
ctx.copy_buffer(buf2, buf1, 3, read_offset=6, write_offset=6)
ctx.copy_buffer(buf2, buf1, 3, read_offset=3, write_offset=9)
assert buf2.read() == b'xyzabc123xyz'
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