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.. _lcov_code_coverage:
Code coverage with lcov
=======================
Prerequisites
-------------
Ensure required packages are installed:
::
$ make install-deps
The Linux gcov and lcov tools can be fussy about gcc / g++ compiler
versions. As of this writing, Ubuntu 22.04 gcov / lcov works with
the latest gcc version (``11.3.0``).
Generate coverage for a test case
---------------------------------
As a first run, in order to generate the coverage report of
a specific plugin or test, run for example
::
$ make test-cov TEST=fib
Then open the file ``.build-root/test-coverage/html/index.html`` in a Chrome browser.
Improving test coverage
-----------------------
When doing modifications on the test cases, you can run
::
# This will run the test & report the result in the coverage data
$ make test-cov-build TEST=fib
# This will generate the html report with the current coverage data
$ make test-cov-post
# To reset the coverage data use
$ make test-cov-prep
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