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Currently the test only pushes 1 byte in each call to uart_fifo_fill(). This doesn't test cases where the driver can accept more than 1 byte in the fifo. Instead, try to push all the bytes in the uart_fifo_fill() call. Internally the driver may only accept 1 byte, in which case the test will be equivalent as before the patch. Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>