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README.md: document repository coverage rules

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This attempts to finesse the rule of no coverage regressions for
discussion with the wider community.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
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Alex Bennée 2022-02-07 12:07:02 +00:00
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@ -10,6 +10,20 @@ Here is the list of device backends that we support:
- [I2C](https://github.com/rust-vmm/vhost-device/blob/main/i2c/README.md)
## Testing and Code Coverage
Like the wider rust-vmm project we expect new features to come with
comprehensive code coverage. However as a multi-binary repository
there are cases where avoiding a drop in coverage can be hard and an
exception to the approach is allowable. These are:
* adding a new binary target (aim at least 60% overall coverage)
* expanding the main function (a small drop is acceptable)
However any new feature added to an existing binary should not cause a
drop in coverage. The general aim should be to always improve
coverage.
## Separation of Concerns
The binaries built by this repository can be run with any VMM which