fetchpatch: add tests for hunks

        "sha256-KlmIbixcds6GyKYt1fx5BxDIrU7msrgDdYo9Va/KJR4=";

  };

  hunks = testers.invalidateFetcherByDrvHash fetchpatch {

    url = "https://github.com/openssh/openssh-portable/commit/35d5917652106aede47621bb3f64044604164043.patch";

    stripLen = 1;

    hunks = [

      2

      3

      4

      5

      6

      7

    ];

    sha256 =

      if isFetchpatch2 then

        "sha256-SXJALY4zC4y/ZV7uVglf+XB5cpC5tS4M8QDGlFRmcFM="

      else

        "sha256-MV7uGgA1ESMR7W6H5FjAIxKcpySdQjWB+L2zaHjd96M=";

  };

  full = testers.invalidateFetcherByDrvHash fetchpatch {

    url = "https://github.com/boostorg/math/commit/7d482f6ebc356e6ec455ccb5f51a23971bf6ce5b.patch";

    relative = "test";

    stripLen = 1;

    extraPrefix = "foo/bar/";

    excludes = [ "foo/bar/bernoulli_no_atomic_mp.cpp" ];

    # Should result in no change.

    hunks = [ "1-" ];

    revert = true;

    sha256 =

      if isFetchpatch2 then

        "sha256-+UKmEbr2rIAweCav/hR/7d4ZrYV84ht/domTrHtm8sM="

      else

        "sha256-+UKmEbr2rIAweCav/hR/7d4ZrYV84ht/domTrHtm8sM=";

    sha256 = "sha256-+UKmEbr2rIAweCav/hR/7d4ZrYV84ht/domTrHtm8sM=";

  };

  decode = testers.invalidateFetcherByDrvHash fetchpatch {