Self-tests can run from a simple string #439
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sourcefrog
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433-cargo-mutants-self-tests-from-a-source-file-string-rather-than-a-working-dir
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Many of the tests are concerned with what mutations are generated from some source code, given some options. For many of these we don't really need a source tree on disk and certainly not to run cargo: it's enough just to have the one file we're mutating.
This adds a new API making just the mutation code accessible to unit tests.
This ought to make tests faster to run, and potentially easier to write because they can be more self contained.
Fixes #433