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-rw-r--r--docs/developer/build-run-debug/code_coverage.rst45
-rw-r--r--docs/developer/build-run-debug/index.rst1
-rw-r--r--docs/developer/extras/index.rst1
l---------docs/developer/extras/lcov.rst1
4 files changed, 46 insertions, 2 deletions
diff --git a/docs/developer/build-run-debug/code_coverage.rst b/docs/developer/build-run-debug/code_coverage.rst
new file mode 100644
index 00000000000..efe750cda21
--- /dev/null
+++ b/docs/developer/build-run-debug/code_coverage.rst
@@ -0,0 +1,45 @@
+.. _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
diff --git a/docs/developer/build-run-debug/index.rst b/docs/developer/build-run-debug/index.rst
index f8bfeab0bf8..c99615ffcf5 100644
--- a/docs/developer/build-run-debug/index.rst
+++ b/docs/developer/build-run-debug/index.rst
@@ -12,3 +12,4 @@ Build, Run & Debug
testing_vpp
gdb_examples
cross_compile_macos
+ code_coverage
diff --git a/docs/developer/extras/index.rst b/docs/developer/extras/index.rst
index a0f2d9b876a..2ee96be768e 100644
--- a/docs/developer/extras/index.rst
+++ b/docs/developer/extras/index.rst
@@ -7,7 +7,6 @@ VPP extra tools
.. toctree::
:maxdepth: 2
- lcov
snap
strongswan
vpp_config
diff --git a/docs/developer/extras/lcov.rst b/docs/developer/extras/lcov.rst
deleted file mode 120000
index 9f8de245ea6..00000000000
--- a/docs/developer/extras/lcov.rst
+++ /dev/null
@@ -1 +0,0 @@
-../../../extras/lcov/README.rst \ No newline at end of file