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# Code Coverage
Provides an overview of how to use code coverage tools when running the unit
tests in the EC codebase.
[TOC]
## Availability
Code coverage is only available for host-based unit tests, as opposed to
manual tests that run on target hardware.
## Building for code coverage
To build host-based unit tests for code coverage, invoke `make` with the
`coverage` target, as follows:
`make coverage -j`
This target will compile and link the unit tests with `--coverage` flag (which
pulls in the `gcov` libraries), run the tests, and then process the profiling
data into a code coverage report using the `lcov` and `genhtml` tools.
The coverage report top-level page is `build/coverage/coverage_rpt/index.html`.
### Noise in the build output
When building for code coverage, you may see multiple warnings of the form
`geninfo: WARNING: no data found for /mnt/host/source/src/platform/ec/core/host/cpu.h`
and
`genhtml: WARNING: function data mismatch at /mnt/host/source/src/platform/ec/common/math_util.c:134`
These warnings can be ignored. (FYI, the "function data mismatch" warnings
appear to be caused in part by using relative paths instead of absolute paths.)
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