Implement coverage script.

.gitignore

@@ -57,3 +57,10 @@ nimbus-build-system.paths
 *.sqlite3-wal
 
 /examples/nodejs/build/
+
+# Coverage
+coverage_html_report/
+*.info
+
+# Wildcard
+*.ignore.*

scripts/run_cov.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+# Check for lcov tool
+which lcov 1>/dev/null 2>&1
+if [ $? != 0 ]
+then
+    echo "[ERROR] You need to have lcov installed in order to generate the test coverage report."
+    exit 1
+fi
+
+SCRIPT_PATH=$(dirname "$(realpath -s "$0")")
+REPO_ROOT=$(dirname $SCRIPT_PATH)
+generated_not_to_break_here="$REPO_ROOT/generated_not_to_break_here"
+
+if [ -f $generated_not_to_break_here ]
+then
+    echo "The file '$generated_not_to_break_here' already exists. Do you want to continue? (y/n)"
+    read -r response
+    if [ "$response" != "y" ]
+    then
+        exit 1
+    fi
+fi
+
+output_directory="$REPO_ROOT/coverage_html_report"
+base_filepath="$REPO_ROOT/tests/test_all"
+nim_filepath=$base_filepath.nim
+info_filepath=$base_filepath.info
+
+# Workaround a nim bug. See https://github.com/nim-lang/Nim/issues/12376
+touch $generated_not_to_break_here
+
+# Generate the coverage report
+nim --debugger:native --passC:--coverage --passL:--coverage --passL:librln_v0.3.4.a --passL:-lm c $nim_filepath
+lcov --base-directory . --directory . --zerocounters -q
+$base_filepath
+lcov --base-directory . --directory . --include "*/waku/**" --include "*/apps/**" --exclude "*/vendor/**" -c -o $info_filepath
+genhtml -o $output_directory $info_filepath
+
+# Cleanup
+rm -rf $info_filepath $base_filepath nimcache
+rm $generated_not_to_break_here