HW19 how to think and test

For these examples, we assume that we have not closed the file (close_bit_writer(…))
or explicitly flushed (flush_bit_writer(…))

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WRITE 1 BIT (i.e., less than the number of remaining bits)
file_contents     current_byte    num_bits_left
                  ₀₀₀₀₀₀₀₀        8
                  1₀₀₀₀₀₀₀        7
Still have room in current_byte so we don't flush afterward.

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WRITE ALL REMAINING BITS
file_contents     current_byte    num_bits_left
                  1₀₀₀₀₀₀₀        7
                  11111111        0
        ----FLUSH before write_bits(…) returns----
                  ₀₀₀₀₀₀₀₀        8
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WRITE MORE THAN THE REMAINING BITS  (ex:  write 11111111₂)
file_contents     current_byte    num_bits_left
                  1₀₀₀₀₀₀₀        7
              ----WRITE AS MANY BITS AS CAN FIT (7 new bits)----
                  11111111        0
              ----FLUSH----
                  ₀₀₀₀₀₀₀₀        8
              ----WRITE REMAINING BITS----
                  1₀₀₀₀₀₀₀        7