[libgweather/ebassi/ci-coverage] ci: Add test code coverage report

[Emmanuele Bassi <ebassi src gnome org>]

commit 60714a52aa4e09f8d53d5fa1a46cedc6208341de
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Nov 23 01:18:45 2021 +0000

    ci: Add test code coverage report
    
    Use lcov to generate a code coverage report from our test suite.

 .gitlab-ci.yml    | 40 ++++++++++++++++++++++++++++++++++++++++
 .gitlab-ci/lcovrc | 13 +++++++++++++
 2 files changed, 53 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7d4f0337..892ee2e1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -256,6 +256,46 @@ asan-build:
       - "_asan_build/meson-logs"
   allow_failure: true
 
+coverage:
+  extends: .build-setup
+  stage: analysis
+  needs: []
+  variables:
+    PROJECT_DEPS:
+      gdk-pixbuf2-devel
+      geocode-glib-devel
+      gettext
+      git
+      gobject-introspection-devel
+      itstool
+      lcov
+      libsoup-devel
+      libxml2-devel
+      ninja-build
+      pylint
+      python3
+      python3-gobject
+      python3-pip
+      python3-wheel
+      redhat-rpm-config
+    MESON_VERSION: "0.55.3"
+    MESON_EXTRA_FLAGS: "--buildtype=debug -Dgtk_doc=false -Dintrospection=false"
+    CFLAGS: "-coverage -ftest-coverage -fprofile-arcs"
+  script:
+    - meson setup --prefix /usr ${MESON_EXTRA_FLAGS} _build .
+    - meson compile -C _build
+    - meson install -C _build
+    - mkdir -p _coverage
+    - lcov --config-file .gitlab-ci/lcovrc --directory _build --capture --initial --output-file 
"_coverage/${CI_JOB_NAME}-baseline.lcov"
+    - meson test -C _build
+    - lcov --config-file .gitlab-ci/lcovrc --directory _build --capture --output-file 
"_coverage/${CI_JOB_NAME}.lcov"
+  artifacts:
+    name: "gweather-${CI_JOB_NAME}-${CI_COMMIT_REF_NAME}"
+    when: always
+    paths:
+      - "_build/meson-logs"
+      - "_coverage"
+
 reference:
   stage: docs
   needs: []
diff --git a/.gitlab-ci/lcovrc b/.gitlab-ci/lcovrc
new file mode 100644
index 00000000..ac5997b7
--- /dev/null
+++ b/.gitlab-ci/lcovrc
@@ -0,0 +1,13 @@
+# lcov and genhtml configuration
+# See http://ltp.sourceforge.net/coverage/lcov/lcovrc.5.php
+
+# Always enable branch coverage
+lcov_branch_coverage = 1
+
+# Exclude precondition assertions, as we can never reasonably get full branch
+# coverage of them, as they should never normally fail.
+# See https://github.com/linux-test-project/lcov/issues/44
+lcov_excl_br_line = LCOV_EXCL_BR_LINE|g_return_if_fail|g_return_val_if_fail|g_assert|g_assert_
+
+# Similarly for unreachable assertions.
+lcov_excl_line = LCOV_EXCL_LINE|g_return_if_reached|g_return_val_if_reached|g_assert_not_reached