refact: add test-coverage.sh and some docs

Signed-off-by: ComixHe <heyuming@deepin.org>

tools/test-coverage.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# SPDX-FileCopyrightText: 2022 UnionTech Software Technology Co., Ltd.
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+cd "$(git rev-parse --show-toplevel)" || exit 255
+
+BUILD_DIR=${BUILD_DIR:="build-cov"}
+
+HTML_DIR=${BUILD_DIR}/html
+
+export ASAN_OPTIONS="halt_on_error=0"
+
+cmake -B "$BUILD_DIR" \
+	-DCMAKE_BUILD_TYPE=Debug \
+	-DCMAKE_CXX_FLAGS="--coverage -fsanitize=address -fsanitize-recover=address " \
+	-DCMAKE_CXX_LINK_FLAGS="-lasan"
+
+cmake --build "$BUILD_DIR" -j$(nproc)
+
+cmake --build "$BUILD_DIR" -j$(nproc) -t test
+
+gcovr -f "src/*" --html-details "$BUILD_DIR"/coverage.html