make: gather code coverage and send report to coveralls

Patch adds collecting code coverage statistics and sending it to
Coveralls [1] for future analysis. Code coverage collected with luatest
and it means that TAP tests doesn't contribute to coverage. No sense to
support them as we plan to rewrite TAP tests to luatest.

1. https://coveralls.io/github/tarantool/expirationd

See also #61
Closes #85

.github/workflows/fast_testing.yaml

@@ -24,6 +24,10 @@ jobs:
           - '2.6'
           - '2.7'
           - '2.8'
+        coveralls: [false]
+        include:
+          - tarantool: '2.8'
+            coveralls: true
 
     runs-on: ubuntu-latest
     steps:
@@ -40,17 +44,25 @@ jobs:
         id: cache-rocks
         with:
           path: .rocks/
-          key: cache-rocks-${{ matrix.tarantool }}-04
+          key: cache-rocks-${{ matrix.tarantool }}-06
 
       - name: Install requirements
         run: |
           tarantoolctl rocks install luatest 0.5.0
           tarantoolctl rocks install luacheck 0.26.0
+          tarantoolctl rocks install luacov 0.13.0-1
+          tarantoolctl rocks install luacov-coveralls 0.2.3-1 --server=http://luarocks.org
           tarantoolctl rocks make
         if: steps.cache-rocks.outputs.cache-hit != 'true'
 
       - run: echo $PWD/.rocks/bin >> $GITHUB_PATH
 
       - run: make check
 
-      - run: make test
+      - run: make coverage
+
+      - name: Send code coverage to coveralls.io
+        run: make coveralls
+        if: ${{ matrix.coveralls }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -3,3 +3,6 @@
 *.xlog
 *.log
 VERSION
+luacov.stats.out
+luacov.report.out
+tags

Makefile

@@ -3,6 +3,8 @@
 # `make -f /path/to/project/Makefile`.
 MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 PROJECT_DIR := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
+LUACOV_REPORT := $(PROJECT_DIR)/luacov.report.out
+LUACOV_STATS := $(PROJECT_DIR)/luacov.stats.out
 
 CLEANUP_FILES  = tarantool.log
 CLEANUP_FILES += *.xlog*
@@ -25,7 +27,7 @@ luacheck:
 
 .PHONY: test
 test:
-	luatest -v
+	luatest -v --coverage
 	rm -rf ${CLEANUP_FILES}
 	INDEX_TYPE='TREE' SPACE_TYPE='vinyl' ./test.lua
 	rm -rf ${CLEANUP_FILES}
@@ -34,5 +36,16 @@ test:
 	INDEX_TYPE='TREE' ./test.lua
 	rm -rf ${CLEANUP_FILES}
 
+$(LUACOV_STATS): test
+
+coverage: $(LUACOV_STATS)
+	sed -i -e 's@'"$$(realpath .)"'/@@' $(LUACOV_STATS)
+	cd $(PROJECT_DIR) && luacov expirationd.lua
+	grep -A999 '^Summary' $(LUACOV_REPORT)
+
+coveralls: $(LUACOV_STATS)
+	echo "Send code coverage data to the coveralls.io service"
+	luacov-coveralls --include ^expirationd --verbose --repo-token ${GITHUB_TOKEN}
+
 clean:
 	rm -rf ${CLEANUP_FILES}

README.md

@@ -1,3 +1,8 @@
+[![Run tests](https://github.com/tarantool/expirationd/actions/workflows/test_on_push.yaml/badge.svg)](https://github.com/tarantool/expirationd/actions/workflows/test_on_push.yaml)
+<a href='https://coveralls.io/github/tarantool/expirationd?branch=master'>
+<img src='https://coveralls.io/repos/github/tarantool/expirationd/badge.svg?branch=master' alt='Coverage Status' />
+</a>
+
 # expirationd -  data expiration with custom quirks.
 
 This package can turn Tarantool into a persistent memcache replacement,