Jeffrey Finkelstein ba1ce7179b dd: move unit tests into dd.rs and test_dd.rs ...

Clean up unit tests in the `dd` crate to make them easier to
manage. This commit does a few things.

* move test cases that test the complete functionality of the `dd`
  program from the `dd_unit_tests` module up to the
  `tests/by-util/test_dd.rs` module so that they can take advantage of
  the testing framework and common testing tools provided by uutils,
* move test cases that test internal functions of the `dd`
  implementation into the `tests` module within `dd.rs` so that they
  live closer to the code they are testing,
* replace test cases defined by macros with test cases defined by
  plain old functions to make the test cases easier to read at a
  glance.

2022-02-15 21:50:48 -05:00

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