8ce928b8e7 Add testing section to readme (Tobin C. Harding)
2e79a0bdc4 Introduce mutation testing (Tobin C. Harding)
Pull request description:
Introduce mutation testing by way of mutagen [0] (see #1484 for context).
- Conditionally add the dev-dependency `mutagen` (using `do_mutate` flag)
This flag is not very well named but `mutagen` and `mutate` are already taken?
- Mutate all methods of the `U256` struct that do not require additional unit tests.
Uses `cfg(all(test, do_mutate), mutate)` - I cannot workout why we need to check on `test` as well i.e., I don't understand why we cannot use `cfg(do_mutate, mutate)`?
With this applied test can be run as usual with a stable toolchain. To run mutagen we use `RUSTFLAGS='--cfg=do_mutate' cargo +nightly mutagen` (doing so runs 29 mutants).
[0] https://github.com/llogiq/mutagen
ACKs for top commit:
Kixunil:
ACK 8ce928b8e7
apoelstra:
ACK 8ce928b8e7
Tree-SHA512: 024ba5d2dc983f7cd0444e09ba13280771157204999d2a44502e07a1d6436f571b75003c7cb543c943f17949b848d4070eda4e194bda774a3e41443ff79af0af